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Product Numbers: PA-SRP-OC12MM(=), PA-SRP-OC12SI(=), PA-SRP-OC12SL(=)
This publication contains instructions for installing and configuring the dual-width OC-12c Dynamic Packet Transport (DPT) port adapter, an OC-12c interface used in Cisco 7200 series, Cisco 7200 VXR, and Cisco uBR7200 series universal broadband router to provide a shared IP over SONET capability.
This publication contains basic configuration steps with examples. The DPT port adapter is compatible with any Cisco 7200 series router with a 200-MHz or 225-MHz network processing engine (NPE-200 or NPE-225) installed, any Cisco 7200 VXR router with an NPE-300 installed, a Cisco uBR7246 with an NPE-200 installed, and a Cisco uBR7246 VXR with an NPE-300 installed.
This configuration note includes the following sections:
The Cisco IOS software running on your router contains extensive features and functionality. For information on Cisco IOS software and for general installation and maintenance information for your router, use the following resources:
This section provides information to help you prepare to install and configure the DPT port adapter. This section also contains safety and ESD-prevention guidelines to help you avoid injury or damage to the equipment during installation.
We recommend that you do the following before beginning any of the procedures in this document:
Figure 1 shows a Cisco 7206VXR router with a DPT port adapter installed in slot 3 and slot 4. In the Cisco 7206 or Cisco 7206VXR router, port adapter slot 1 is in the lower left position with port adapter slot 3 and slot 5 directly above it. Port adapter slot 2 is in the lower right position, with port adapter slot 4 and slot 6 directly above it. (The DPT port adapter can be installed in any horizontal pair of these slots; use the odd-numbered slot number associated with the left-side slots.) In the Cisco 7204 or Cisco 7204VXR router, port adapter slot 1 is in the lower left position with port adapter slot 3 directly above it. Port adapter slot 2 is in the lower right position, with port adapter slot 4 directly above it.
Figure 2 shows the port adapter numbering scheme of a Cisco uBR7246 VXR or Cisco uBR7246 router. Slot 0 is reserved for the universal broadband router`s I/O controller. You must install a DPT port adapter horizontally under the I/O controller, taking up both slot 1 and slot 2.
To determine whether your Cisco 7200 series, Cisco 7200 VXR, or Cisco uBR7200 series router is compatible with the DPT port adapter, use the show version command to display the current hardware configuration of the router, including the system software version that is currently loaded and running.
In the following example, the running system software is Cisco IOS Release 12.0(6)S.
Router> show version Cisco Internetwork Operating System Software IOS (tm) 7200 Software (C7200-P-M), Version 12.0(6)S Synced to mainline version: 11.1(12.1) Copyright (c) 1986-1999 by cisco Systems, Inc. Compiled Mon 30-Jan-99 08:45
You can check the version of the default ROM image by removing the board and checking the ROM labels, or by configuring the interface or system software to boot from ROM, restarting the system, and using these same commands to check the running version.
If the displays indicate that the running system software is earlier than Cisco IOS Release 12.0(6)S for the Cisco 7200 series or Cisco 7200 VXR, or earlier than Cisco IOS Release 12.0(7)SC for the Cisco uBR7200 series, check the contents of Flash memory to determine if the required images are available on your system. The show flash command displays a list of all files stored in Flash memory.
The show microcode command displays a list of all the microcode images currently bundled with the Cisco IOS software. If these displays indicate that the required system software and microcode are not available, contact a service representative for upgrade information.
The DPT port adapter is compatible with any Cisco 7200 series router equipped with an NPE-200 or NPE-225 or Cisco 7200 VXR router equipped with an NPE-300, running Cisco IOS Release 12.0(6)S or later. The DPT port adapter is compatible with a Cisco uBR7246 router equipped with an NPE-200 or a Cisco uBR7246 VXR router equipped with an NPE-300, running Cisco IOS Release 12.0(7)SC or later.
The DPT port adapter and Cisco 7200 series, Cisco 7200 VXR, or Cisco uBR7200 series router's network processor memory configurations include the following:
You need the following tools and parts to install or upgrade a DPT port adapter. If you need additional equipment, contact your service representative for ordering information.
Use a single-mode or multimode fiber-optic interface cable to connect your Cisco 7200 series, Cisco 7200 VXR, or Cisco uBR7200 series router to another router or switch. In general, multimode cables are gray or orange, and single-mode cables are yellow. Cables can be obtained from the following cable vendors:
For SONET or SDH single-mode and multimode fiber-optic connections, use one duplex SC-type connector (see Figure 3) or two simplex SC-type connectors (see Figure 4).
Attach either one duplex fiber cable or two simplex fiber cables between the DPT port adapter and the device to which the DPT port adapter is connected. Observe the receive (RX) and transmit (TX) cable relationship shown in Figure 5.
The following warnings apply when you work with fiber-optic cable ports.
 | Warning Because invisible radiation may be emitted from the aperture of the port when no fiber cable is connected, avoid exposure to radiation and do not stare into open apertures. |
| Warning
Class 1 laser product (single-mode). |
| Warning
Class 1 LED product (multimode). |
This section lists safety guidelines to follow when working with any equipment that connects to electrical power or telephone wiring.
Safety warnings appear throughout this publication in procedures that, if performed incorrectly, might harm you. A warning symbol precedes each warning statement.
Warning
This warning symbol means danger. You are in a situation that could cause bodily injury. Before you work on any equipment, be aware of the hazards involved with electrical circuitry and be familiar with standard practices for preventing accidents. To see translations of the warnings that appear in this publication, refer to the Regulatory Compliance and Safety Information document that accompanied this device.
Waarschuwing Dit waarschuwingssymbool betekent gevaar. U verkeert in een situatie die lichamelijk letsel kan veroorzaken. Voordat u aan enige apparatuur gaat werken, dient u zich bewust te zijn van de bij elektrische schakelingen betrokken risico's en dient u op de hoogte te zijn van standaard maatregelen om ongelukken te voorkomen. Voor vertalingen van de waarschuwingen die in deze publicatie verschijnen, kunt u het document Regulatory Compliance and Safety Information (Informatie over naleving van veiligheids- en andere voorschriften) raadplegen dat bij dit toestel is ingesloten.
Varoitus Tämä varoitusmerkki merkitsee vaaraa. Olet tilanteessa, joka voi johtaa ruumiinvammaan. Ennen kuin työskentelet minkään laitteiston parissa, ota selvää sähkökytkentöihin liittyvistä vaaroista ja tavanomaisista onnettomuuksien ehkäisykeinoista. Tässä julkaisussa esiintyvien varoitusten käännökset löydät laitteen mukana olevasta Regulatory Compliance and Safety Information -kirjasesta (määräysten noudattaminen ja tietoa turvallisuudesta).
Attention Ce symbole d'avertissement indique un danger. Vous vous trouvez dans une situation pouvant causer des blessures ou des dommages corporels. Avant de travailler sur un équipement, soyez conscient des dangers posés par les circuits électriques et familiarisez-vous avec les procédures couramment utilisées pour éviter les accidents. Pour prendre connaissance des traductions d'avertissements figurant dans cette publication, consultez le document Regulatory Compliance and Safety Information (Conformité aux règlements et consignes de sécurité) qui accompagne cet appareil.
Warnung Dieses Warnsymbol bedeutet Gefahr. Sie befinden sich in einer Situation, die zu einer Körperverletzung führen könnte. Bevor Sie mit der Arbeit an irgendeinem Gerät beginnen, seien Sie sich der mit elektrischen Stromkreisen verbundenen Gefahren und der Standardpraktiken zur Vermeidung von Unfällen bewußt. Übersetzungen der in dieser Veröffentlichung enthaltenen Warnhinweise finden Sie im Dokument Regulatory Compliance and Safety Information (Informationen zu behördlichen Vorschriften und Sicherheit), das zusammen mit diesem Gerät geliefert wurde.
Avvertenza Questo simbolo di avvertenza indica un pericolo. La situazione potrebbe causare infortuni alle persone. Prima di lavorare su qualsiasi apparecchiatura, occorre conoscere i pericoli relativi ai circuiti elettrici ed essere al corrente delle pratiche standard per la prevenzione di incidenti. La traduzione delle avvertenze riportate in questa pubblicazione si trova nel documento Regulatory Compliance and Safety Information (Conformità alle norme e informazioni sulla sicurezza) che accompagna questo dispositivo.
Advarsel Dette varselsymbolet betyr fare. Du befinner deg i en situasjon som kan føre til personskade. Før du utfører arbeid på utstyr, må du vare oppmerksom på de faremomentene som elektriske kretser innebærer, samt gjøre deg kjent med vanlig praksis når det gjelder å unngå ulykker. Hvis du vil se oversettelser av de advarslene som finnes i denne publikasjonen, kan du se i dokumentet Regulatory Compliance and Safety Information (Overholdelse av forskrifter og sikkerhetsinformasjon) som ble levert med denne enheten.
Aviso Este símbolo de aviso indica perigo. Encontra-se numa situação que lhe poderá causar danos físicos. Antes de começar a trabalhar com qualquer equipamento, familiarize-se com os perigos relacionados com circuitos eléctricos, e com quaisquer práticas comuns que possam prevenir possíveis acidentes. Para ver as traduções dos avisos que constam desta publicação, consulte o documento Regulatory Compliance and Safety Information (Informação de Segurança e Disposições Reguladoras) que acompanha este dispositivo.
¡Advertencia! Este símbolo de aviso significa peligro. Existe riesgo para su integridad física. Antes de manipular cualquier equipo, considerar los riesgos que entraña la corriente eléctrica y familiarizarse con los procedimientos estándar de prevención de accidentes. Para ver una traducción de las advertencias que aparecen en esta publicación, consultar el documento titulado Regulatory Compliance and Safety Information (Información sobre seguridad y conformidad con las disposiciones reglamentarias) que se acompaña con este dispositivo.
Varning! Denna varningssymbol signalerar fara. Du befinner dig i en situation som kan leda till personskada. Innan du utför arbete på någon utrustning måste du vara medveten om farorna med elkretsar och känna till vanligt förfarande för att förebygga skador. Se förklaringar av de varningar som förkommer i denna publikation i dokumentet Regulatory Compliance and Safety Information (Efterrättelse av föreskrifter och säkerhetsinformation), vilket medföljer denna anordning.
The single-mode transmitter in the DPT port adapter uses a small laser to transmit the light signal to the network ring. Keep the transmit port covered whenever a cable is not connected to it. Although multimode transceivers typically use LEDs for transmission, it is good practice to keep open ports covered and avoid staring into open ports or apertures. The single-mode aperture port contains a laser warning label, as shown in Figure 6.
| Warning Invisible laser radiation may be emitted from the aperture ports of the single-mode products when no fiber cable is connected. Avoid exposure and do not stare into open apertures. |
| Warning Class 1 laser product. |
The multimode aperture contains a Class 1 LED warning label, as shown in Figure 7.
| Warning Because invisible laser radiation may be emitted from the aperture of the port when no fiber cable is connected, avoid exposure to radiation and do not stare into open apertures. |
| Warning
Class 1 LED product. |
Follow these basic guidelines when working with any electrical equipment:
Use the following guidelines when working with any equipment that is connected to telephone wiring or to other network cabling:
Electrostatic discharge (ESD) damage, which can occur when electronic cards or components are improperly handled, results in complete or intermittent failures. The DPT port adapter consists of a printed circuit board that is fixed in a metal carrier. Electromagnetic interference (EMI) shielding, connectors, and a handle are integral components of the carrier. Although the metal carrier helps to protect the board from ESD, always use a preventive antistatic strap when handling the DPT port adapter. Handle the carriers by the handles and the carrier edges only; never touch the boards or connector pins.
Following are guidelines for preventing ESD damage:
The following terms and acronyms are used in this publication:
The DPT port adapter (see Figure 8) is a dual-width OC-12c port adapter that provides a shared IP over SONET capability in a Cisco 7200 series, Cisco 7200 VXR, or Cisco uBR7200 series router. The DPT port adapter is available in three models:
The DPT port adapter provides the Cisco 7200 series, Cisco 7200 VXR, or Cisco uBR7200 series router with two SC duplex ports. Each SC duplex port provides the physical connection to an adjacent device in a DPT ring.
The DPT port adapter is designed to be deployed in SONET OC-12 DPT rings. DPT rings can also be connected to SONET add drop multiplexers (ADMs), thus allowing for the creation of small or very large DPT rings.
The DPT port adapter:
Spatial Reuse Protocol (SRP) is a media-independent MAC layer protocol that operates over two counterrotating fiber-optic rings. The dual rings provide survivability of data in case of a failed node or a break in connecting cables by rerouting the data path over the alternate ring. SRP provides a more efficient use of bandwidth by having packets traverse only the part of the ring necessary to get to the destination node. Once the packet has reached the destination node, it is removed from the ring, allowing other parts of the ring to reuse the bandwidth. Data packets travel on one ring, while associated control packets travel in the opposite direction on the alternate ring, ensuring that the data takes the shortest path based on its destination. See Figure 9.
Each node on a DPT ring represents a Cisco 7200 series router, Cisco 7200 VXR router, Cisco uBR7200 series universal broadband router, Cisco 7500 series router, or a Cisco 12000 series Gigabit Switch Router (GSR). A Cisco 7200 series, Cisco 7200 VXR, or Cisco uBR7200 series router can be used as an aggregation device for the Cisco 12000 series GSR. The Cisco 7200 series, Cisco 7200 VXR, or Cisco uBR7200 series router collects data from lower-speed interfaces and passes it to the Cisco 12000 series GSR. Typically, more Cisco 7200 series routers, Cisco 7200 VXR routers, Cisco uBR7200 series routers, or Cisco 7500 series routers aggregate traffic toward fewer Cisco 12000 GSRs.
A DPT ring can contain up to 32 nodes at one time, with each node holding a map of the ring topology that it continually updates to ensure that data takes the shortest path to its destination. The frequency of the updating can be manually configured. See the "Configuring the DPT Topology Feature" section.
The DPT interface uses the SONET ring architecture, which provides redundancy and protection from a failed node or fiber cut through the use of the Intelligent Protective Switch (IPS). When the DPT ring topology changes because of a node failure, as shown in Figure 10, the system software automatically puts the node into pass-through mode, where data continues to pass through the node, but the node is no longer seen on the ring topology map. In the event of a fiber cut, ring wraps are created to redirect data traffic over the alternate ring. See Figure 11.
In both pass-through mode and wrap mode, data packets not destined for the affected node still reach their destination.
The SONET specification for fiber-optic transmission defines two types of fiber: single-mode and multimode. Signals travel farther through single-mode fiber than through multimode fiber.
The maximum distance for single-mode installations is determined by the amount of light loss in the fiber path. Good-quality single-mode fiber with very few splices can carry an OC-12c/STM-4 signal 9.3 miles (15 kilometers) or more. Good-quality multimode fiber can carry the signal up to 1640 feet (500 meters). If your environment requires the signal to travel close to the typical maximum distance (as listed in Table 1), use an optical time-domain reflectometer (OTDR) to measure the power loss.
| Cable | Power Budget | Transmit Power | Receive Power | Typical Maximum Distance |
|---|---|---|---|---|
Single-mode intermediate range | 12 dB | -28 to -8 dBm | 9.3 miles (15 km) | |
Single-mode long range | 25 dB | -3 to 2 dBm at 1270 to 1380 nm | -28 to -8 dBm | 24.8 miles (40 km) |
Multimode | 6 dB | -20 to -14 dBm at 1270 to 1380 nm | -26 to -14 dBm | 1640.4 feet (500 m) |
| 1dBm = decibels per milliwatt 2nm = nanometer |
 | Caution For safety, periodically check the resistance value of the antistatic strap. The measurement should be between 1 and 10 megohms (Mohms). |
The dual-width DPT port adapter can be installed in any available horizontally aligned pair of port adapter slots in Cisco 7200 series, Cisco 7200 VXR, and Cisco uBR7200 series routers. Figure 12 shows a DPT port adapter installed in port adapter slot 3 and slot 4 of a Cisco 7206 VXR. Figure 13 shows a DPT port adapter installed in port adapter slot 1 and slot 2 of a Cisco uBR7246.
Depending on the circumstances, you might need to install a new port adapter or replace a failed port adapter in a Cisco 7200 series, Cisco 7200 VXR, or Cisco uBR7200 series router. In either case no tools are necessary; all port adapters available for Cisco 7200 series, Cisco 7200 VXR, and Cisco uBR7200 series routers connect directly to the router midplane and are locked into position by a port adapter lever.
When removing and replacing a port adapter, you need an antistatic mat onto which you can place a removed port adapter and an antistatic container into which you can place a failed port adapter for shipment back to the factory.
When a port adapter slot is not in use, blank port adapters must fill empty slots to allow the router to conform to EMI emissions requirements and to allow proper airflow across the port adapters. If you plan to install a new port adapter in a slot that is not in use, you must first remove the blank port adapter.
The following sections explain how to remove and install single-width and dual-width port adapters in a Cisco 7200 series, Cisco 7200 VXR, or Cisco uBR7200 series router.
Following is the procedure for removing a single-width port adapter from a Cisco 7200 series, Cisco 7200 VXR, or Cisco uBR7200 series router:
Step 1 Attach an ESD-preventive wrist strap between you and an unfinished chassis surface.
Step 2 Place the port adapter lever, or slide the port adapter retention clip, for the desired port adapter slot in the unlocked position. The port adapter lever or retention clip remains in the unlocked position. (See Figure 14 and Figure 15.)
Step 3 Grasp the handle on the port adapter and pull the port adapter from the router midplane, about halfway out of its slot. If you are removing a blank port adapter, pull the blank port adapter completely out of the chassis slot.
Step 4 With the port adapter halfway out of the slot, disconnect all cables from the port adapter.
Step 5 After disconnecting the cables, pull the port adapter from its chassis slot.
 | Caution Always handle the port adapter by the carrier edges and handle; never touch the port adapter components or connector pins. (See Figure 16.) |
Step 6 Place the port adapter on an antistatic surface with its components facing upward, or in a static shielding bag. If the port adapter will be returned to the factory, immediately place it in a static shielding bag.
This completes the procedure for removing a single-width port adapter from a Cisco 7200 series, Cisco 7200 VXR, or Cisco uBR7200 series router.
When installing a new dual-width port adapter you must first remove the port adapter slot divider. Following is the procedure for removing a port adapter slot divider from a Cisco 7200 series, Cisco 7200 VXR, or Cisco uBR7200 series router:
Step 1 Remove installed single-width port adapters from the slots on both sides of the port adapter slot divider. (See the "Removing a Single-Width Port Adapter" section for instructions.)
Step 2 With one hand, raise the slot divider lever to unlock the slot divider from the chassis.
(See Figure 17 and Figure 18.)
Step 3 With the slot divider lever still raised, use your other hand to pull the slot divider from the chassis. (See Figure 19.)
Step 4 Store the slot divider in a location where you can retrieve it for use later.
This completes the procedure for removing a port adapter slot divider from a Cisco 7200 series, Cisco 7200 VXR, or Cisco uBR7200 series router.
Before you remove a DPT port adapter that you will not replace, we recommend that you shut down (disable) the interfaces to prevent anomalies when you reinstall the new or reconfigured DPT port adapter. When you shut down an interface, it is designated administratively down in the show command displays. Figure 16 shows proper handling of the DPT port adapter during installation.
To remove the double-width port adapter, follow these steps:
Step 1 Attach an ESD-preventive wrist strap between you and an unfinished chassis surface.
Step 2 Place the port adapter levers, or the port adapter retention clip, for the desired port adapter slots in the unlocked position. The port adapter levers or retention clip remain in the unlocked position. (See Figure 21 and Figure 22.)
Step 3 Grasp the two handles on the dual-width port adapter and pull the port adapter from the router midplane, about halfway out of its slot.
Step 4 With the port adapter halfway out of the slot, disconnect all cables from the port adapter.
Step 5 After disconnecting the cables, pull the port adapter from its chassis slot.
| Caution Always handle the port adapter by the carrier edges and handles; never touch the port adapter's components or connector pins. (See Figure 16.) |
Step 6 Place the port adapter on an antistatic surface with its components facing upward, or in a static shielding bag. If the port adapter will be returned to the factory, immediately place it in a static shielding bag.
This completes the procedure for removing a double-width port adapter from a Cisco 7200 series, Cisco 7200 VXR, or Cisco uBR7200 series router.
The DPT port adapter slides into any two adjacent port adapter slots and connects directly to the midplane.
If you are installing a new DPT port adapter, you must first remove the blank port adapters from the available port adapter slots.
Following is the procedure for installing a dual-width port adapter in a Cisco 7200 series router:
Step 1 Attach an ESD-preventive wrist strap between you and an unfinished chassis surface.
Step 2 If necessary, remove the port adapter slot divider that divides the two port adapter slots into which you are installing the dual-width port adapter. (See the "Removing a Single-Width Port Adapter" section for instructions.)
Step 3 Use both hands to grasp the port adapter by its metal carrier edges and position the port adapter so that its components are downward. (See Figure 16.)
Step 4 Align the left and the right edge of the port adapter metal carrier between the guides in the port adapter slot. (See Figure 23 and Figure 24.)
Step 5 With the metal carrier aligned in the slot guides, gently slide the port adapter halfway into the slot.
| Caution Do not slide the port adapter all the way into the slot until you have connected all required cables. Trying to do so disrupts normal operation of the router. |
Step 6 With the port adapter halfway in the slot, attach either two simplex fiber-optic cables or one duplex fiber-optic cable between the DPTIP interface port and your network. Ensure that you observe the receive (RX) and transmit (TX) cable relationship shown in Figure 27.
Step 7 After connecting the cables, carefully slide the port adapter all the way into the slot until the port adapter is seated in the router midplane.
Step 8 Move the port adapter lever for each port adapter slot to the locked position.
(See Figure 25.)
This completes the procedure for installing a dual-width port adapter in a Cisco 7200 series, Cisco 7200 VXR, or Cisco uBR7200 series router.
After you install the DPT port adapter and connect the fiber-optic cables, verify the installation by observing the LED states. When the system has reinitialized all interfaces, the enabled LED on the DPT port adapter and on all other port adapters should go on.
The following conditions must all be met before the DPT port adapter is enabled; if any one of these conditions is not met, the enabled LED does not go on:
The eight LEDs on the faceplate of the DPT port adapter (see Figure 27) show the DPT port adapter status, as well as the status of the individual ports. Table 2 explains the DPT port adapter LEDs.
| LED Label | Color | State | Function |
ENABLED | Green | On | Indicates that the DPT port adapter is enabled for operation; however, the interface port might be in the shutdown state. |
PASS-THROUGH | Amber | On | Indicates the DPT port adapter is in a pass-through state. |
RX PKTS | Green | On | Indicates the DPT port adapter has received a packet. This LED flickers in normal operation, indicating traffic. |
RX CARRIER | Green | On | Indicates the DPT port adapter has detected valid SONET or SDH framing on the received carrier. |
ACTIVE | Green | On | Indicates that side A or B of the DPT port adapter is functioning. |
When you remove and replace the DPT port adapter, the system provides status messages on the console screen. The messages are for information only. The following sample display shows the events logged by the system as a DPT port adapter was removed from slot 3; the system then reinitialized the remaining port adapters and marked as down the DPT port adapter that was removed from slot 3. When the DPT port adapter was reinserted, the system marked the interface as up again because the interface was not shut down before the DPT port adapter was removed.
Router# %OIR-6-REMCARD: Card removed from slot 3, interfaces disabled %LINK-5-CHANGED: Interface SRP3/0, changed state to administratively down Router# %OIR-6-INSCARD: Card inserted in slot 0, interfaces administratively shut down %LINK-5-CHANGED: Interface SRP3/0, changed state to up
When a new DPT port adapter is inserted or when a DPT port adapter is moved to a new slot, the system recognizes the new DPT port adapter but leaves it in a down state until you configure it. Change the state to up with the configure command. The following sample display shows the events logged by the system as a new DPT port adapter is inserted in slot 3:
Router# %OIR-6-INSCARD: Card inserted in slot 3, interfaces administratively shut down
Verify that the DPT port adapter is installed correctly as follows:
Step 1 Verify that the system discovers the DPT port adapter as follows:
Step 2 When the reinitialization is complete, verify that the enabled LED on the DPT port adapter is on and remains on. If the LED does stay on, proceed to Step 5. If the enabled LED does not stay on, proceed to the next step.
Step 3 If the enabled LED on the DPT port adapter fails to go on, the DPT port adapter may not be fully seated in the midplane. Pull the port adapter away from the midplane and carefully reseat the port adapter into the router midplane. After the system reinitializes the interfaces, the enabled LED on the DPT port adapter should go on. If the enabled LED goes on, proceed to Step 5. If the enabled LED does not go on, proceed to the next step.
Step 4 If the enabled LED still fails to go on, remove the DPT port adapter and try installing it in another set of available port adapter slots.
Step 5 If the DPT port adapter is new, proceed to the "Performing a Basic Configuration" section to configure the new interface.
Step 6 If this installation was a replacement DPT port adapter, use the show interfaces command to verify the status of the interface. (See the "Using show Commands to Check System Status" section for command descriptions and examples.)
Step 7 When the interface is up, check the activity of the interface with the DPT port adapter LEDs. See the "DPT Port Adapter LEDs" section.
Step 8 If error messages appear on the console terminal, refer to the appropriate software publication for error message definitions. See the "If You Need More Information" section. If you experience other problems that you are unable to solve, contact a service representative for assistance.
This completes the DPT port adapter installation. If you installed a new DPT port adapter, you must now configure the new interface, as described in the following section.
Detailed information on all commands used in configuring the DPT port adapter is provided in the Cisco IOS command reference publication. The following sections provide basic information needed to install the DPT port adapter in a DPT ring:
Physical port addresses specify the actual physical location of each interface port on the router.
(See Figure 28.) This address is composed of a two-part number in the format port adapter slot number/port number.
Interface ports maintain the same address regardless of whether other port adapters are installed in or removed from the slot. However, when you move a port adapter to a different slot, the first number in the address changes to reflect the new port adapter slot number.
In the Cisco 7200 series and Cisco 7200 VXR routers, port adapter slots are numbered from the lower left to the upper right, beginning with port adapter slot 1 and continuing through port adapter slot 4 for the Cisco 7204 and Cisco 7204VXR, and slot 6 for the Cisco 7206 and Cisco 7206VXR. Port adapter slot 0 is reserved for the optional Fast Ethernet port on the I/O controller---if present. Figure 28 shows the DPT port adapter in slots 3 and 4 of a Cisco 7206VXR.
In the Cisco uBR7200 series, port adapter slots are numbered from the top down and left-to-right for horizontally adjacent slots, beginning with port adapter slot 0 and continuing through port adapter slot 2. Port adapter slot 0 is reserved for the optional Fast Ethernet port on the I/O controller---if present. Figure 29 shows the DPT port adapter in slots 1 and 2 of a Cisco uBR7246.
The individual interface port numbers always begin with 0. The number of additional ports depends on the number of ports on a port adapter. The DPT port adapter has only one interface port and occupies two slot. When installed in port adapter slot 3 and port adapter slot 4, it has an address of 3/0. (See Figure 28.) If the DPT port adapter were installed in port adapter slot 1 and port adapter slot 2, its port address would be 1/0. (See Figure 29.)
You can also identify interface ports by physically checking the slot/interface port location on the front of the router or by using show commands to display information about a specific interface or all interfaces in the router.
You modify the configuration of your router through the software command interpreter called the EXEC. You must enter the privileged level of the EXEC command interpreter with the enable command before you can use the configure command to configure a new interface or change the existing configuration of an interface. The system prompts you for a password if one has been set.
The system prompt for the privileged level ends with a pound sign (#) instead of an angle bracket (>). At the console terminal, use the following procedure to enter the privileged level:
Step 1 At the user-level EXEC prompt, enter the enable command. The EXEC prompts you for a privileged-level password as follows:
Router> enable Password
Step 2 Enter the password (the password is case sensitive). For security purposes, the password is not displayed.
Step 3 When you enter the correct password, the system displays the privileged-mode system prompt (#):
Router#
Before you replace an interface cable, replace port adapters, or remove an interface that you will not replace, use the shutdown command to shut down (disable) the interfaces. Doing so prevents anomalies from occurring when you reinstall the new or reconfigured port adapters. When you shut down an interface, it is designated administratively down in the show command displays.
Follow these steps to shut down an interface on a Cisco 7200 series, Cisco 7200 VXR, or Cisco uBR7200 series router:
Step 1 Enter the privileged level of the EXEC command interpreter. (Refer to the previous section, "Using the EXEC Command Interpreter"for instructions.)
Step 2 At the privileged-level prompt, enter configuration mode and specify that the console terminal is the source of the configuration subcommands:
Router# configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router(config)#
Step 3 Enter the interface configuration mode and enter the shutdown command:
Router(config)# interface srp 1/0 Router(config-int)# shutdown
Step 4 Write the new configuration to nonvolatile memory:
Router# copy running-config startup-config [OK] Router#
The system displays an OK message when the configuration has been stored.
Step 5 To verify that the new interfaces are now in the correct state (shutdown), use the show interface srp port adapter number/interface port number command to display the specific interface, or use the show controllers command, followed by the type (srp) and port adapter number/interface port number, to display the status of all interfaces of the controller.
Router# show controllers srp SRP5/0 - Side B (Inner RX, Outer TX) SECTION LOF = 0 LOS = 0 BIP(B1) = 0 LINE AIS = 0 RDI = 0 FEBE = 0 BIP(B2) = 0 PATH AIS = 0 RDI = 0 FEBE = 0 BIP(B3) = 0 LOP = 0 NEWPTR = 0 PSE = 0 NSE = 0 Active Defects: None Active Alarms: None Alarm reporting enabled for: SF SLOS SLOF B1-TCA B2-TCA PLOP B3-TCA IPS Rx(K1/K2) = 00/00 Rx(S1S0) = 02, Rx(C2) = 00 CLOCK SOURCE Internal PATH TRACE BUFFER: STABLE Remote hostname : stingray Remote interface: srp5/0 Remote IP addr : 2.2.2.3 Remote Ring id : Inner Ring BER thresholds: SF = 10e-3 SD = 10e-6 TCA thresholds: B1 = 10e-6 B2 = 10e-6 B3 = 10e-6 [some display text omitted]
Step 6 To reenable the interfaces, repeat the above steps, but use the no shutdown command; then write the new configuration to nonvolatile memory:
Router(config)# interfaces srp 5/0 Router(config-int)# no shutdown Ctrl-Z Router# Router# copy running-config startup-config [OK] Router# show interfaces srp 5/0 SRP5/0 is up, line protocol is up Hardware is SRP, address is 0010.0ba6.408c (bia 0010.0ba6.408c) [display text omitted]
For complete descriptions of software configuration commands, refer to the publications listed in the "If You Need More Information" section.
This section describes guidelines for performing a basic configuration: enabling the DPT port adapter and specifying IP routing. You might also need to enter other configuration subcommands, depending on the requirements for your system configuration and the protocols you plan to route on the interface. After configuring the DPT port adapter in a Cisco 7200 series, Cisco 7200 VXR, or Cisco uBR7200 series router, see the "Adding a Node to a DPT Ring" section for adding the router to a DPT ring.
Before using the configure command, you must enter the privileged level of the EXEC command interpreter with the enable command. The system prompts you for a password if one has been set.
Use the following procedure to configure the DPT port adapter. Press the Return key after each configuration step, unless otherwise noted.
Step 1 Confirm that the system recognizes the DPT port adapter by entering the show running-config command:
Router# show running-config
For an example of output from the show running-config command, see the "Using show Commands to Check System Status" section.
Step 2 Enter configuration mode and specify that the console terminal is the source of the configuration subcommands:
Router# configure terminal
Step 3 Enable IP routing by entering the ip routing command:
Router(config)# ip routing
Step 4 At the prompt, specify the new interface to configure by entering the interface command, followed by the type (srp) and slot/port. The example that follows is for a DPT port adapter in slot 1:
Router(config)# interface srp 1/0
Step 5 Assign an IP address and subnet mask to the interface with the ip address configuration subcommand, as in the following example:
Router(config)# interface srp 1/0 Router(config-if)# ip address 192.168.2.3 255.0.0.0
Step 6 Use the srp framing command to verify that the framing is set to SONET for both
side A and side B. The example below shows framing being set to SONET on side B of the DPT port adapter in slot 1:
Router(config)# interface srp 1/0 Router(config-if)# srp framing sonet side b
Step 7 Use the srp internal clock command to set the clock source to internal for both sides of the DPT port adapter. The example below shows side A being set to internal:
Router(config)# interface srp 1/0 Router(config-if)# srp internal clock side a
Step 8 Change the shutdown state to up and enable the interface:
Router(config)# interface srp 1/0 Router(config-if)# no shutdown
The no shutdown command passes an enable command to the DPT port adapter. It also causes the DPT port adapter to configure itself based on the previous configuration commands sent.
Step 9 Add any other configuration subcommands required to enable routing protocols and adjust the interface characteristics.
Step 10 When you have included all of the configuration subcommands to complete the configuration, enter ^Z (press the Control key while you press Z) to exit configuration mode.
Step 11 Write the new configuration to memory:
Router# copy running-config startup-config
The system displays an OK message when the configuration has been stored.
After you have completed your configuration, you can check it using show commands. For an explanation of show commands, see the "Using show Commands to Check System Status" section.
Intelligent Protective Switch (IPS) ensures that ring traffic flow continues uninterrupted even if device or ring failures occur. IPS protects the DPT ring by initiating ring wraps that route traffic in the opposite direction over the alternate ring. The system software creates ring wraps by issuing an IPS request when failures are detected. The five types of IPS requests are hierarchical, with higher-priority requests taking precedence over lower-priority requests (for example, if a signal failure was detected at the same time that an operator entered a manual switch request, the system would create the ring wrap at the point of signal failure and the manual switch would be ignored). Table 3 lists the types of IPS requests in order of priority.
| Request Type | Originator |
|---|---|
1 Forced Switch (FS) | Operator |
2 Signal Fail (SF) | Software |
3 Signal Degrade (SD) | Software |
4 Manual Switch (MS) | Operator |
5 Wait to Restore (WTR) | Software |
When you add a node to a DPT ring, you must create a break in the ring. You can create the break by initiating a forced switch request using the srp ips request command. See the "Adding a Node to a DPT Ring" section. The following example shows a forced switch request on side A of the DPT port adapter:
Router(config)# interface srp 2/0 Router(config-if)# srp ips request fs side A
If you need more detailed information about IPS commands, refer to publications listed in the
"If You Need More Information" section.
Every node on a DPT ring maintains a topology map of the ring so that it knows where to route traffic. It updates the topology map by periodically sending out a query, called a topology discovery packet, out onto the ring. Each node on the ring adds its own MAC address to the packet. When the discovery packet returns to the originating node, the contents of the packet are used to update the node's topology map. You use the srp topology-timer command to set the frequency with which the node sends out topology discovery packets.
The show srp topology command is used to display the MAC addresses of each node on a DPT ring. See the "Using show Commands to Check System Status" section.
If you need more detailed information about DPT topology commands, see the "If You Need More Information" section.
The default values of the DPT port adapter configuration parameters can be changed to match your network requirements. Table 4 lists the configuration parameter, the command used to alter it, and the default value of the parameter. If you need more detailed configuration information, refer to the publications listed in the "If You Need More Information" section
| Parameter | Configuration Command | Default Value |
|---|---|---|
Maximum transmission unit (MTU) | mtu bytes | 9000 bytes |
Buffer - size | srp buffer-size bytes | h = 4096 kbytes, m = 4096 kbytes, l = 8192 kbytes |
Count | srp count 48-bit source address in hexadecimal format H.H.H. | --- |
Deficit-round-robin | srp defict-round-robin | quantum = 9216, defict = 16384 |
Flag | srp flag [c2 value] [j0 value] [s1s0 value] | c2 set to 0x16; j0 set to 0xcc;s1s0 set to 0 |
Framing | srp framing [sdh | sonet] | SONET OC-12c |
Internal-clock | srp clock-source [internal | line] [a | b] | Internal |
IPS | srp ips [request | timer | wtr-timer] | timer = 1 sec; wtr-timer = 60 sec |
Loopback | srp loopback [internal | line] [a | b] | --- |
Priority-map | srp priority-map [receive | transmit] | receive high = 5, receive med = 3, transmit = 7 |
Random-detect | srp random-detect [compute-interval | input | precedence] | compute interval = 128 sec |
Reject | srp reject 48-bit source address in hexadecimal format H.H.H. | --- |
Shutdown | srp shutdown [a | b] | --- |
Topology timer | srp topology-timer value in seconds | 5 sec |
TX-traffic-rate | srp tx-traffic-rate rate in kbps | 10,000 kbps |
The system maintains different kinds of information about its configuration and system status. This information can be accessed by using the show commands. This section contains show command information relevant to the installation and configuration of the DPT port adapter. See the "If You Need More Information" section to locate more detailed information on show commands.
This section contains examples of the following commands:
Use the show running-config command to display the currently running configuration. The example below shows that the current software version is Cisco IOS Release 12.0(6)S, a DPT port adapter is installed (the DPT port adapter is shown as interface SRP1/0), and the IP address of the DPT port adapter is 192.168.0.20 255.255.255.0:
Router# show running-config Building configuration... Current configuration: version 12.0(6)S service timestamps debug uptime service timestamps log datetime no service password-encryption service udp-small-servers service tcp-small-servers ! hostname uut2 ! ip subnet-zero ip host abrick 192.168.254.254 ip host curly 192.168.1.20 ip host sink 192.168.1.30 ip host sneha 192.168.1.40 ip name-server 192.168.2.132 ! ! ! interface SRP1/0 mac-address 0010.5555.6666 ip address 192.168.0.20 255.255.255.0 no ip directed-broadcast no ip route-cache cef no ip route-cache distributed no keepalive no srp random-detect input high no srp random-detect input medium no srp random-detect input low
Use the show version command to display the configuration of the system hardware, and Cisco IOS software information. The following example shows that the Cisco IOS version is 12.0(6)S, and that a DPT port adapter is installed:
Router# show version Cisco Internetwork Operating System Software IOS (tm) 7200 Software (C7200-JS-M), Experimental Version 12.0(6)S(19990617:032053)] Copyright (c) 1986-1999 by cisco Systems, Inc. Compiled Thu 17-Jun-99 09:32 by karthiks Image text-base: 0x600088F8, data-base: 0x611F2000 ROM: System Bootstrap, Version 11.1(13)CA, EARLY DEPLOYMENT RELEASE SOFTWARE (f) BOOTFLASH: 7200 Software (C7200-BOOT-M), Version 11.3(2)AA, EARLY DEPLOYMENT, R) router uptime is 4 days, 16 minutes System returned to ROM by reload System image file is "tftp://223.255.254.254/muck/shirjosh/c7200-js-mz.Jun17" cisco 7206 (NPE200) processor with 122880K/8192K bytes of memory. R5000 CPU at 200Mhz, Implementation 35, Rev 2.1, 512KB L2 Cache 6 slot midplane, Version 1.3 Last reset from power-on Bridging software. X.25 software, Version 3.0.0. SuperLAT software (copyright 1990 by Meridian Technology Corp). TN3270 Emulation software. 8 Ethernet/IEEE 802.3 interface(s) 1 FastEthernet/IEEE 802.3 interface(s) 1 FDDI network interface(s) 1 SRP network interface(s) 125K bytes of non-volatile configuration memory. 4096K bytes of packet SRAM memory. 20480K bytes of Flash PCMCIA card at slot 0 (Sector size 128K). 4096K bytes of Flash internal SIMM (Sector size 256K). Configuration register is 0x0
Use the show protocols command to show whether a DPT port adapter is up, as shown in the following example:
router# show protocols Global values: Internet Protocol routing is enabled FastEthernet0/0 is up, line protocol is up Ethernet1/0 is up, line protocol is up Internet address is 10.1.1.41/24 Ethernet1/1 is up, line protocol is down Internet address is 10.9.9.7/24 Ethernet1/2 is administratively down, line protocol is down Ethernet1/3 is up, line protocol is down Ethernet1/4 is up, line protocol is up Ethernet1/5 is administratively down, line protocol is down Ethernet1/6 is administratively down, line protocol is down Ethernet1/7 is administratively down, line protocol is down Fddi2/0 is down, line protocol is down Internet address is 10.4.4.3/24 SRP5/0 is up, line protocol is up Internet address is 10.2.2.3/24
Use the show diag command to view system hardware information. The following example shows a DPT port adapter installed in slot 5 and slot 6:
Router# show diag 5
Slot 5/6:
SRP Double Width, Multi Mode port adapter, 1 port
Port adapter is analyzed
Port adapter insertion time 1w3d ago
EEPROM contents at hardware discovery:
Hardware revision 1.0 Board revision UNKNOWN
Serial number 0 Part number 73-3250-02
Test history 0x0 RMA number 00-00-00
EEPROM format version 1
EEPROM contents (hex):
0x20: 01 A7 01 00 00 00 00 00 49 0C B2 02 00 00 00 00
0x30: 03 00 00 00 00 00 00 00 FF FF FF FF FF FF FF FF
Use the show controllers srp command to display the location of the DPT port adapter and other configuration information specific to the DPT port adapter. See the following example:
Router# show controllers srp SRP5/0 SRP5/0 - Side A (Outer RX, Inner TX) SECTION LOF = 0 LOS = 0 BIP(B1) = 0 LINE AIS = 0 RDI = 0 FEBE = 0 BIP(B2) = 0 PATH AIS = 0 RDI = 0 FEBE = 0 BIP(B3) = 0 LOP = 0 NEWPTR = 0 PSE = 0 NSE = 0 Active Defects: None Active Alarms: None Alarm reporting enabled for: SF SLOS SLOF B1-TCA B2-TCA PLOP B3-TCA IPS Rx(K1/K2) = 00/00 Rx(S1S0) = 02, Rx(C2) = CF CLOCK SOURCE Internal PATH TRACE BUFFER: STABLE Remote hostname : stingray Remote interface: srp1/0/0 Remote IP addr : 10.2.2.5 Remote Ring id : Outer Ring BER thresholds: SF = 10e-3 SD = 10e-6 TCA thresholds: B1 = 10e-6 B2 = 10e-6 B3 = 10e-6 SRP5/0 - Side B (Inner RX, Outer TX) SECTION LOF = 0 LOS = 0 BIP(B1) = 0 LINE AIS = 0 RDI = 0 FEBE = 0 BIP(B2) = 0 PATH AIS = 0 RDI = 0 FEBE = 0 BIP(B3) = 0 LOP = 0 NEWPTR = 0 PSE = 0 NSE = 0 Active Defects: None Active Alarms: None Alarm reporting enabled for: SF SLOS SLOF B1-TCA B2-TCA PLOP B3-TCA IPS Rx(K1/K2) = 00/00 Rx(S1S0) = 02, Rx(C2) = 06 CLOCK SOURCE Internal PATH TRACE BUFFER: STABLE Remote hostname : manofwar Remote interface: srp3/0/0 Remote IP addr : 10.2.2.6 Remote Ring id : Inner Ring BER thresholds: SF = 10e-3 SD = 10e-6 TCA thresholds: B1 = 10e-6 B2 = 10e-6 B3 = 10e-6
Use the show interfaces srp command to show statistics for the DPT port adapter interfaces, as shown in the following example:
Router# show interfaces srp 5/0
SRP5/0 is up, line protocol is up
Hardware is SRP, address is 0010.0ba6.408c (bia 0010.0ba6.408c)
Internet address is 10.2.2.3/24
MTU 4470 bytes, BW 622000 Kbit, DLY 100 usec, rely 255/255, load 1/255
Encapsulation SRP, loopback not set
Last input 00:00:00, output 00:00:00, output hang never
Last clearing of "show interface" counters 1w3d
Queueing strategy: fifo
Output queue 0/40, 0 drops; input queue 0/75, 0 drops
5 minute input rate 0 bits/sec, 2 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
2369845 packets input, 158630960 bytes, 0 no buffer
Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
2369516 packets output, 158542697 bytes, 0 underruns
0 output errors, 0 collisions, 1 interface resets
0 output buffer failures, 0 output buffers swapped out
Side A received errors:
0 input errors, 0 CRC, 0 runts, 0 giants, 0 ignored, 0 abort
Side B received errors:
0 input errors, 0 CRC, 0 runts, 0 giants, 0 ignored, 0 abort
Use the show srp ips command to show IPS information for a specific interface. The following example shows the MAC addresses of the two nodes that are connected to the interface, and information about the state of the connections:
router# show srp ips 2/0
IPS Information for Interface SRP2/0
MAC Addresses
Side A (Outer ring RX) neighbour 0000.0000.0002
Side B (Inner ring RX) neighbour 0000.0000.0001
Node MAC address 0000.0000.0003
IPS State
Side A not wrapped
Side B wrapped
Side A (Inner ring TX) IPS pkt. sent every 10 sec. (next pkt. after 6 sec.)
Side B (Outer ring TX) IPS pkt. sent every 10 sec. (next pkt. after 6 sec.)
IPS WTR period is 60 sec. (timer is inactive)
Node IPS State WRAPPED
IPS Self Detected Requests
Side A IDLE
Side B SF
IPS messages received
Side A (Outer ring RX) {0000.0000.0002,SF ,L,1024}
Side B (Inner ring RX) {0000.0000.0001,IDLE,S,1024}
IPS messages transmitted
Side A (Inner ring TX) {0000.0000.0003,SF ,L,1024}
Side B (Outer ring TX) {0000.0000.0003,SF ,S,1024}
Source Address Information for Interface SRP2/0
000a.1234.bcde, reject
000b.1234.bcde, pkt. count 0
Topology Map for Interface SRP2/0
Topology pkt. sent every 20 sec. (next pkt. after 1 sec.)
Last received topology pkt. 00:00:18
Nodes on the ring:2
Hops (outer ring) Address
0 0000.0000.0003 Wrapped
1 0000.0000.0002 Wrapped
Use the show srp topology command to show the identity of the nodes on the DPT ring according to their MAC addresses. The following examples show a three-node DPT ring. In the second example, nodes 0 and 2 are wrapped:
Router# show srp topology
Topology Map for Interface SRP5/0
Topology pkt. sent every 61 sec. (next pkt. after 16 sec.)
Last received topology pkt. 00:00:45
Nodes on the ring:3
Hops (outer ring) Address
0 0000.0000.0001
1 0000.0000.0002
2 0000.0000.0003
Router# show srp topology
Topology Map for Interface SRP5/0
Topology pkt. sent every 61 sec. (next pkt. after 54 sec.)
Last received topology pkt. 00:00:07
Nodes on the ring:3
Hops (Outer ring) Address
0 0000.0000.0001 Wrapped
1 0000.0000.0002
2 0000.0000.0003 Wrapped
Use the show srp source-counters command to show the number of packets received or rejected when SRP count and reject have been configured. The following example shows 1201 packets have come from another node, and 400 have been rejected:
Router# show srp source-counters
Source Address Information for Interface SRP5/0
000a.1234.5678, index 1, pkt. count 1201
000b.1234.5678, reject, pkt. count 400
A DPT ring may contain as many as 32 nodes, or as few as 2 nodes. This section documents the layout and configuration of a three-node DPT ring. It is assumed that the actual physical installation of the Cisco 7200 series, Cisco 7200 VXR, or Cisco uBR7200 series routers has already been accomplished.
Before the DPT ring can be created, each Cisco 7200 series, Cisco 7200 VXR, or Cisco uBR7200 series router (node) must have a DPT port adapter installed and configured. See the "DPT Port Adapter Removal and Installation" section, and the "Configuring the DPT Port Adapter" section. Once the individual nodes are configured, the inner and outer rings of the DPT ring must be connected as shown in Figure 30, and the DPT port adapters must be enabled. The following procedure describes the internodal connections of the DPT ring and the configuration commands used to create the ring.
Step 1 While in config mode, use the shutdown command to disable the DPT port adapter on each node, as shown below:
Router(config)# interface srp 1/0 Router(config-if)# shutdown
Step 2 Connect the nodes as shown in Figure 31, being careful to observe the receive (RX) and transmit (TX) cable relationship. Table 5 lists the internodal cable connections for a three-node DPT ring.
Step 3 Use the no shutdown command to enable the DPT port adapter of each node, as shown below:
Router(config)# interface srp 1/0 Router(config-if)# no shutdown
Step 4 Use the show srp topology command to verify that the all three nodes are recognized as part of the DPT ring. The output shows the number of nodes on the ring and their MAC addresses. See the "Using show Commands to Check System Status" section.
| Internodal Cable Connections | |
|---|---|
| From Node/Connector | To Node/Connector |
Node A/RX outer | Node C/TX outer |
Node A/TX inner | Node C/RX inner |
Node A/TX outer | Node B/RX outer |
Node A/RX inner | Node B/TX inner |
Node B/RX outer | Node A/TX outer |
Node B/TX inner | Node A/RX inner |
Node B/TX outer | Node C/RX outer |
Node B/RX inner | Node C/TX inner |
Node C/RX outer | Node B/TX outer |
Node C/TX inner | Node B/RX inner |
Node C/TX outer | Node A/RX outer |
Node C/RX inner | Node A/TX inner |
The following sections describe the procedures for adding or removing a node in a DPT ring:
When you want to install a new node in a DPT ring, you must first install and configure a DPT port adapter in the Cisco 7200 series, Cisco 7200 VXR, or Cisco uBR7200 series router, and then install and configure the router as a node in the DPT ring. This section describes the procedure for adding a node to a DPT ring.
To add a node to a DPT ring, you must first reroute the traffic flow over the ring through an alternate path, where the new node is to be installed. Figure 32 shows a four-node DPT ring. Use the following procedure to add a node between nodes A and D on the ring:
Step 1 While in global configuration mode, stop data traffic between nodes A and D on the DPT ring by entering a forced switch command srp ips request fs side A on the node A router. See the "Configuring the Intelligent Protective Switch Feature" section. This creates two ring wraps between the two nodes. See Figure 33.
Step 2 From the config mode, enter the command show srp topology to verify that the ring wraps are in place. See the "Using show Commands to Check System Status" section.
Step 3 Disconnect the fiber-optic cables connecting side A of node A to side B of node D. See Figure 27.
Step 4 Connect side A of node A to side B of the new node, using two simplex or one duplex fiber-optic cable. See the "DPT Port Adapter Interface Cables" section. Connect side A of the new node to side B of node D (see Figure 34).
Step 5 If the DPT port adapter in the new router (node E) has not been configured, do so at this time. See the "Configuring the DPT Port Adapter" section.
Step 6 Enter the no shutdown command to bring up the node E router.
Step 7 Confirm that the system recognizes the new node by entering the show srp topology command. The output shows the number of nodes on the ring, their MAC addresses, and the state of the nodes (wrapped or not).
Step 8 Remove the two ring wraps created by the forced switch by entering the no srp ips request fs side A command on the node A router.
Step 9 Confirm that the ring wraps are no longer in place by entering the show srp topology command. The output shows the number of nodes on the ring, their MAC addresses, and the state of the nodes (wrapped or not).
This section describes the procedure for removing a node from a DPT ring. The following steps describe how to remove node D from a four-node DPT ring, similar to that shown in Figure 32.
Step 1 Isolate node D by entering the forced switch command srp ips request fs side A on the node A router, and srp ips request fs side B on the node C router.
Step 2 Enter the show srp topology command on either router to verify that the ring wraps are in place, and that node D no longer exists on the ring.
Step 3 Disconnect both ends of the cable connecting side A of node D to side B of node C.
Step 4 Disconnect the cable connected to side B of node D and connect it to side B of node C.
Step 5 Remove the two ring wraps created by the forced switch on nodes A and C by entering the no srp ips request fs side A command on node A, and no srp ips request fs side B command on node C.
Step 6 Enable IP routing by entering the ip routing command to restart data traffic.
This completes the procedure for removing a node from a DPT ring.
This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to part 15 of the FCC rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio-frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful interference, in which case users will be required to correct the interference at their own expense.
You can determine whether your equipment is causing interference by turning it off. If the interference stops, it was probably caused by the Cisco equipment or one of its peripheral devices. If the equipment causes interference to radio or television reception, try to correct the interference by using one or more of the following measures:
Modifications to this product not authorized by Cisco Systems, Inc. could void the FCC approval and negate your authority to operate the product.
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Posted: Tue Jan 11 14:22:32 PST 2000
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