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July 24, 2000
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Note You can find the most current Cisco IOS documentation on Cisco Connection Online (CCO ). These electronic documents may contain updates and modifications made after the hardcopy documents were printed. |
These release notes for the Cisco 1600 series routers describe the enhancements provided in Cisco IOS Release 12.1 T. These release notes are updated as needed.
For a list of the software caveats that apply to Cisco IOS Release 12.1 T, see Caveats for Cisco IOS Release 12.1 T that accompanies these release notes. The caveats document is updated for every maintenance release and is located on Cisco Connection Online (CCO) and the Documentation CD-ROM.
Use these release notes with Cross-Platform Release Notes for Cisco IOS Release 12.1 on CCO and the Documentation CD-ROM.
These release notes describe the following topics:
These release notes describe the Cisco 1600 series routers for Cisco IOS Release 12.1 T, which is an early deployment (ED) release based on Cisco IOS Release 12.1. Early deployment releases contain fixes for software caveats and support for new Cisco hardware and software features. The following list shows the recent early deployment releases of the Cisco 1600 series routers:
For more information, see the "Platform-Specific Documents" section about accessing related release note documents.
This section describes the system requirements for Cisco IOS Release 12.1 T:
| Platforms | Feature Sets | Image Name | Software Image | Recommended Flash Memory | Recommended DRAM Memory | Runs from |
|---|---|---|---|---|---|---|
Cisco 1600- | IP Feature Sets | IP | c1600-y-l | 8 MB | 4 MB | Flash |
IP Plus | c1600-sy-l | 12 MB | 4 MB | Flash | ||
IP Plus IPSEC 56 | c1600-sy56i-l | 12 MB | 6 MB | Flash | ||
IP/IPX | c1600-ny-l | 8 MB | 4 MB | Flash | ||
IP/IPX/AT/IBM | c1600-bnr2y-l | 12 MB | 4 MB | Flash | ||
IP/IPX/AT/IBM Plus | c1600-bnr2sy-l | 16 MB | 6 MB | Flash | ||
IP/FW | c1600-oy-1 | 12 MB | 6 MB | Flash | ||
IP/IPX/FW Plus | c1600-nosy-l | 12 MB | 6 MB | Flash | ||
IP/FW Plus IPSEC 56 | c1600-osy56i-l | 16 MB | 6 MB | Flash | ||
IP/IPX/AT/IBM/FW Plus IPSEC 56 | c1600-bnor2sy56i-l | 16 MB | 6 MB | Flash | ||
Cisco 1601-R - 1605-R | IP Feature Sets | IP | c1600-y-mz | 4 MB | 10 MB | RAM |
IP Plus | c1600-sy-mz | 6 MB | 12 MB | RAM | ||
IP Plus IPSEC 56 | c1600-sy56i-mz | 6 MB | 16 MB | RAM | ||
IP/IPX | c1600-ny-mz | 4 MB | 10 MB | RAM | ||
IP/IPX/AT/IBM | c1600-bnr2y-mz | 6 MB | 12 MB | RAM | ||
IP/IPX/AT/IBM Plus | c1600-bnr2sy-mz | 8 MB | 16 MB | RAM | ||
IP/FW | c1600-oy-mz | 6 MB | 12 MB | RAM | ||
IP/IPX/FW Plus | c1600-nosy-mz | 6 MB | 16 MB | RAM | ||
IP/FW Plus IPSEC 56 | c1600-osy56i-mz | 6 MB | 16 MB | RAM | ||
IP/IPX/AT/IBM/FW Plus IPSEC 56 | c1600-bnor2sy56i-mz | 8 MB | 24 MB | RAM |
Cisco IOS Release 12.1 T supports the Cisco 1600 series routers:
Cisco 1600 series routers have two memory architectures: one run-from-Flash (RFF) and one run-from-RAM (RFR). Router model names with an R are RFR routers; all other models are RFF. In this document, model names without an R refer to both RFF and RFR models, except where otherwise noted.
For detailed descriptions of the new hardware features, see "New and Changed Information" section.
| Interface, Network Module, or Data Rate | Platforms Supported |
|---|---|
1 Ethernet port | Cisco 1601-1604 |
1 built-in WAN port | Cisco 1601-1604 |
1 WAN interface-card expansion slot | Cisco 1601-1604 |
1 built-in serial WAN port | Cisco 1601 |
1 onboard 56-kbps 4-wire DSU/CSU | Cisco 1602 |
1 ISDN BRI S/T port | Cisco 1603 |
ISDN BRI U interface with a built-in NT 1 device | Cisco 1604 |
2 Ethernet LAN interfaces | Cisco 1601-R-1605-R |
1-port ISDN BRI with S/T interface | Cisco 1601, Cisco 1602, Cisco 1601-R-1605-R |
1-port synchronous/ asynchronous serial | Cisco 1600 series |
1-port ISDN BRI with integrated NT1 and with a U interface | Cisco 1601, 1602, Cisco 1601-R-1605-R |
1-port ISDN Leased Line BRI S/T WAN interface | Cisco 1603, Cisco 1604 |
1-port 56/64kbps DSU/CSU WAN interface | Cisco 1600 series |
1-port T1/Fractional T1 DSU/CSU WAN interface | Cisco 1600 series |
To determine the version of Cisco IOS software running on your Cisco 1600 series router, log in to the router and enter the show version EXEC command:
router> show version Cisco Internetwork Operating System Software IOS (tm)12.1 TSoftware (C1600-NY-L), Version12.1(3)T, RELEASE SOFTWARE
For general information about upgrading to a new software release, see Cisco IOS Upgrade Ordering Instructions located at:
http://www.cisco.com /warp/public/cc/cisco /mkt/ios/prodlit /957_pp.htm
The Cisco IOS software is packaged in feature sets consisting of software images--depending on the platform. Each feature set contains a specific set of Cisco IOS features.
Cisco IOS Release 12.1 T supports the same feature sets as Cisco IOS Release 12.1, but Release 12.1 T can include new features supported by the Cisco 1600 series routers.
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Caution Cisco IOS images with strong encryption (including, but not limited to 168-bit (3DES) data encryption feature sets) are subject to United States government export controls and have limited distribution. Strong encryption images to be installed outside the United States are likely to require an export license. Customer orders may be denied or subject to delay due to United States government regulations. When applicable, purchaser/user must obtain local import and use authorizations for all encryption strengths. Please contact your sales representative or distributor for more information, or send an e-mail to export@cisco.com. |
Table 3 and Table 4 list the features and feature sets supported by the Cisco 1600 series routers in Cisco IOS Release 12.1 T. Both use the following conventions:
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Note These feature set tables contain only the features specific to the T-train. For a more complete list of features, see the feature set tables in the mainline release notes on CCO: http://www.cisco.com/univercd/cc /td/doc/product/software/ios121/ 121relnt/xprn121/ 121 feats.htm. |
| Feature Set | ||||||
|---|---|---|---|---|---|---|
| Features | In | IP | IP Plus | IP Plus IPSEC 56 | IP/IPX | IP/IPX/AT/ IBM |
| Configuration Fundamentals |
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| (3) | Yes | Yes | Yes | Yes | Yes |
| (3) | Yes | Yes | Yes | Yes | Yes |
| IP Multicast |
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| (2) | No | Yes | Yes | No | No |
| IP Routing Protocols |
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| (2) | Yes | Yes | Yes | Yes | Yes |
| Management |
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| Yes | Yes | Yes | Yes | Yes |
| WAN |
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| (2) | No | Yes | Yes | No | No |
| Feature Set | ||||||
|---|---|---|---|---|---|---|
| Features | In | IP/IPX/AT/ IBM Plus | IP/FW | IP/IPX/FW Plus | IP/FW Plus IPSEC 56 | IP/IPX/AT/ IBM/FW Plus IPSEC 56 |
| Configuration Fundamentals |
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| (3) | Yes | Yes | Yes | Yes | Yes |
| (3) | Yes | Yes | Yes | Yes | Yes |
| IP Multicast |
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| (2) | Yes | No | Yes | Yes | Yes |
| IP Routing Protocols |
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| (2) | Yes | Yes | Yes | Yes | Yes |
| Management |
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| Yes | Yes | Yes | Yes | Yes |
| WAN |
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| (2) | Yes | No | Yes | Yes | Yes |
The following sections list the new hardware and software features supported by the Cisco 1600 series routers for Release 12.1 T.
The following new software features are supported by the Cisco 1600 series routers for Release 12.1(3)T.
The Circuit Interface Description MIB feature adds support for a new Cisco enterprise MIB, used for monitoring individual circuits using SNMP. The Circuit Interface MIB (CISCO-CIRCUIT-INTERFACE-MIB) provides a MIB object which can be used to provide a description of individual circut-based interfaces (for example, interfaces using ATM or Frame-Relay). This description will then be returned when linkup and linkdown SNMP traps are generated for the described interface.
The Circuit Interface MIB consits of a single table, with each row being a sequence of two objects: Circuit Interface Description (cciDescr) and Circuit Interface Status (cciStatus).
The cciDescr object is used to identify circuits using a textual description of up to 255 characters specified by the user (note that MIB objects are modified using network managment system (NMS) applications, and can not be configured using the Cisco IOS command-line interface). When the row is created by a user, a value is set for the cciDescr object. The table is indexed by ifIndex from the IF-MIB. The cciStatus is the RowStatus object for the rows in the table.
The cciStatus object can be set to only two values by the user: createAndGo(4), which creates a new row, and destroy(6), which removes an exisiting row. If the row is created successfully, the cciStatus will be active(1). When creating a new row, the user should set the cciDescr object along with the cciStatus in a single snmp set pdu command. If the row is already active, only the cciDescr object can be modified. The other option is to delete the row first by setting the cciStatus to destroy(6) and then recreate the row with a new value for cciDescr. When creating a new row, the ifIndex is validated first. If the ifIndex value is not valid, the row is not created and an error code is returned. Similarly, if ,when an interface is deleted, there was a corresponding row in this table, that row will be deleted automatically.
After a description is created for an interface, the description (the cciDescr object) will be sent along with the other varbinds as part of linkup and linkdown trap notifications.
The Individual SNMP Trap Support Feature adds the ability to enable or disable SNMP system management notifications (traps) individually. SNMP traps that can be specified are authentication-failure, linkup, linkdown, and coldstart. This feature expands the functionality of the snmp-server enable traps snmp command. Prior to the introduction of this feature, all four trap types were enabled or disabled simultaneously by the snmp-server enable traps snmp command.
Individual SNMP Trap Support is supported for all versions of SNMP supported by Cisco IOS software (SNMPv1, SNMPv2c, and SNMPv3).
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Note As both SNMP traps and informs are enabled or disabled thorough the use of the snmp-server enable traps command, all references to traps in this document also apply to informs. The term "notifications" is used to refer to both traps and informs. |
The following new software features are supported by the Cisco 1600 series routers for Release 12.1(2)T:
Bidir-PIM is a variant of the Protocol Independent Multicast (PIM) suite of routing protocols for IP multicast. In PIM, packet traffic for a multicast group is routed according to the rules of the mode configured for that multicast group. The Cisco IOS implementation of PIM supports three modes for a multicast group:
A router can simultaneously support all three modes or any combination of them for different multicast groups. In bidirectional mode, traffic is only routed along a bidirectional shared tree that is rooted at the rendezvous point (RP) for the group. In bidir-PIM, the IP address of the RP acts as the key to having all routers establish a loop-free spanning tree topology rooted in that IP address. This IP address does not need to be a router, but can be any unassigned IP address on a network that is reachable throughout the PIM domain. Using this technique is the preferred configuration for establishing a redundant RP configuration for bidir-PIM.
Membership to a bidirectional group is signalled via explicit Join messages. Traffic from sources is unconditionally sent up the shared tree toward the RP and passed down the tree toward the receivers on each branch of the tree.
Bidir-PIM is designed to be used for many-to-many applications within individual PIM domains. Multicast groups in bidirectional mode can scale to an arbitrary number of sources without incurring overhead due to the number of sources.
Bidir-PIM is derived from the mechanisms of PIM sparse mode (PIM SM) and shares many SPT operations. Bidir-PIM also has unconditional forwarding of source traffic toward the RP upstream on the shared tree, but no registering process for sources as in PIM SM. These modifications are necessary and sufficient to allow forwarding of traffic in all routers solely based on the (*, G) multicast routing entries. This feature eliminates any source-specific state and allows scaling capability to an arbitrary number of sources.
The Frame Relay Switching Enhancements feature enables a router in a Frame Relay network to be used as a Frame Relay switch.
This feature includes the following Frame Relay switching enhancements:
Before the Frame Relay Switching Enhancements feature was introduced, routers had limited Frame Relay switching functionality. With this feature, a router acting as a virtual Frame Relay switch can be configured to do the following:
The explosive growth of the Internet has placed the focus on the scalability of Interior Gateway Protocols such as OSPF. The networks using OSPF are becoming larger every day and will continue to expand to accommodate the demand to connect to the Internet.
Internet Service Providers and customers with large networks have regularly complained that OSPF has a traffic overhead, even when the network topology is stable.
By design, OSPF requires link-state advertisements (LSAs) to be refreshed as they expire after 3600 seconds. Some implementations have tried to improve the flooding by reducing the frequency to refresh from 30 minutes to around 50 minutes or so.
This solution reduces the amount of refresh traffic but requires at least one refresh before the LSA expires. The OSPF Flooding Reduction feature works by reducing unnecessary refreshing and flooding of already known and unchanged information. To achieve this reduction, the LSAs are now flooded with the higher bit set, thus making them DoNotAge (DNA) LSAs.
The following new software feature is supported by the Cisco 1600 series routers for Release 12.1(1)T:
The Service Assurance (SA) Agent is an both an enhancement to and a new name for the Response Time Reporter (RTR) feature that was introduced in Cisco IOS Release 11.2. The feature allows you to monitor network performance between a Cisco router and a remote device (which can be another Cisco router, an IP host, or a mainframe host) by measuring key Service Level Agreement (SLA) metrics such as response time, network resources, availability, jitter, connect time, packet loss and application performance.This feature enables you to perform troubleshooting, problem analysis, and notifications based on the statistics collected by the SA Agent.
The SA Agent Enhancements feature introduces new performance measurement operations and enhancements to assist in the measurement of SLAs. With Cisco IOS Release 12.1(1)T, the SA Agent provides new capabilities that enable you to do the following:
Old Cisco Management Information Bases (MIBs) will be replaced in a future release. Currently, OLD-CISCO-* MIBs are being converted into more scalable MIBs--without affecting existing Cisco IOS products or NMS applications. You can update from deprecated MIBs to the replacement MIBs as shown in Table 5.
| Deprecated MIB | Replacement |
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OLD-CISCO-APPLETALK-MIB | RFC1243-MIB |
OLD-CISCO-CHASSIS-MIB | ENTITY-MIB |
OLD-CISCO-CPUK-MIB | To be decided |
OLD-CISCO-DECNET-MIB | To be decided |
OLD-CISCO-ENV-MIB | CISCO-ENVMON-MIB |
OLD-CISCO-FLASH-MIB | CISCO-FLASH-MIB |
OLD-CISCO-INTERFACES-MIB | IF-MIB CISCO-QUEUE-MIB |
OLD-CISCO-IP-MIB | To be decided |
OLD-CISCO-MEMORY-MIB | CISCO-MEMORY-POOL-MIB |
OLD-CISCO-NOVELL-MIB | NOVELL-IPX-MIB |
OLD-CISCO-SYS-MIB | (Compilation of other OLD* MIBs) |
OLD-CISCO-SYSTEM-MIB | CISCO-CONFIG-COPY-MIB |
OLD-CISCO-TCP-MIB | CISCO-TCP-MIB |
OLD-CISCO-TS-MIB | To be decided |
OLD-CISCO-VINES-MIB | CISCO-VINES-MIB |
OLD-CISCO-XNS-MIB | To be decided |
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Note Cisco Management Information Base (MIB) User Quick Reference is no longer published. If you have an account with CCO, you can find the current list of MIBs supported by Cisco. To reach the Cisco Network Management Toolkit, go to CCO, press Login, and click to Software Center: Network Mgmt Products: Cisco Network Management Toolkit: Cisco MIB. |
Caveats describe unexpected behavior in Cisco IOS software releases. Severity 1 caveats are the most serious caveats; severity 2 caveats are less serious.
For information on caveats in Cisco IOS Release 12.1 T, see Caveats for Cisco IOS Release 12.1 T.
All caveats in Cisco IOS Release 12.1 are also in Cisco IOS Release 12.1 T.
For information on caveats in Cisco IOS Release 12.0, see Caveats for Cisco IOS Release 12.1, which lists severity 1 and 2 caveats and is located on CCO and the Documentation CD-ROM.
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Note If you have an account with CCO, you can use Bug Navigator II to find caveats of any severity for any release. To reach Bug Navigator II, go to CCO and press Login. Then go to Software Center: Cisco IOS Software: Cisco Bugtool Navigator II. Another option is to go to http://www.cisco.com/support/bugtools. |
The following sections describe the documentation available for the Cisco 1600 series routers. These documents consist of hardware and software installation guides, Cisco IOS configuration and command references, system error messages, feature modules, and other documents.
Documentation is available as printed manuals or electronic documents, except for feature modules, which are available online on CCO and the Documentation CD-ROM.
Use these release notes with these documents:
The following documents are specific to Cisco IOS Release 12.1 and are located on CCO and the Documentation CD-ROM:
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Note If you have an account with CCO, you can use Bug Navigator II to find caveats of any severity for any release. To reach Bug Navigator II, go to CCO and press Login. Then go to Software Center: Cisco IOS Software: Cisco Bugtool Navigator II. Another option is to go to http://www.cisco.com/support/bugtools. |
These individual and groups of documents are available for the Cisco 1600 series routers on CCO and the Documentation CD-ROM:
Feature modules describe new features supported by Cisco IOS Release 12.1 T and are updates to the Cisco IOS documentation set. A feature module consists of a brief overview of the feature, benefits, configuration tasks, and a command reference. As updates, the feature modules are available online only. Feature module information is incorporated in the next printing of the Cisco IOS documentation set.
On CCO at:
Technical Documents: Documentation Home Page: Cisco IOS Software Configuration: Cisco IOS Release 12.1: New Feature Documentation
On the Documentation CD-ROM at:
Cisco Product Documentation: Cisco IOS Software Configuration: Cisco IOS Release 12.1: New Feature Documentation
The Cisco IOS software documentation set consists of the Cisco IOS configuration guides, Cisco IOS command references, and several other supporting documents that are shipped with your order in electronic form on the Documentation CD-ROM--unless you specifically ordered the printed versions.
Each module in the Cisco IOS documentation set consists of two books: a configuration guide and a corresponding command reference. Chapters in a configuration guide describe protocols, configuration tasks, Cisco IOS software functionality, and contain comprehensive configuration examples. Chapters in a command reference provide complete command syntax information. Use each configuration guide with its corresponding command reference.
On CCO and the Documentation CD-ROM, two master hot-linked documents provide information for the Cisco IOS software documentation set.
On CCO at:
Technical Documents: Documentation Home Page: Cisco IOS Software Configuration: Cisco IOS Release 12.1: Configuration Guides and Command References
On the Documentation CD-ROM at:
Cisco Product Documentation: Cisco IOS Software Configuration: Cisco IOS Release 12.1: Configuration Guides and Command References
Table 6 describes the contents of the Cisco IOS Release 12.1 software documentation set, which is available in electronic form and in printed form ordered.
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Note You can find the most current Cisco IOS documentation on CCO and the Documentation CD-ROM. These electronic documents may contain updates and modifications made after the hard-copy documents were printed. |
On CCO at:
Technical Documents: Documentation Home Page: Cisco IOS Software Configuration: Cisco IOS Release 12.1
On the Documentation CD-ROM at:
Cisco Product Documentation: Cisco IOS Software Configuration: Cisco IOS Release 12.1
| Books | Major Topics |
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| Cisco IOS User Interfaces |
| Using Cisco IOS Software |
| Preparing for Dial Access |
| Interface Configuration Overview |
| IP Addressing and Services |
| AppleTalk and Novell IPX Overview |
| Apollo Domain, Banyan VINES, DECnet, ISO CLNS, and XNS Overview |
| Multiservice Applications Overview |
| Quality of Service Overview |
| Security Overview |
| Cisco IOS Switching Services Overview |
| Wide-Area Networking Overview |
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Note Cisco Management Information Base (MIB) User Quick Reference is no longer published. If you have an account with CCO, you can find the current list of MIBs supported by Cisco. To reach the Cisco Network Management Toolkit, go to CC, press Login, and click to Software Center: Network Mgmt Products: Cisco Network Management Toolkit: Cisco MIB. |
You can access the most current Cisco documentation on the World Wide Web at http://www.cisco.com, http://www-china.cisco.com, or http://www-europe.cisco.com.
Cisco documentation and additional literature are available in a CD-ROM package, which ships with your product. The Documentation CD-ROM is updated monthly. Therefore, it is probably more current than printed documentation. The CD-ROM package is available as a single unit or as an annual subscription.
Registered CCO users can order the Documentation CD-ROM and other Cisco Product documentation through our online Subscription Services at http://www.cisco.com/cgi-bin/subcat/kaojump.cgi.
Nonregistered CCO users can order documentation through a local account representative by calling Cisco's corporate headquarters (California, USA) at 408 526-4000 or, in North America, call 800 553-NETS (6387).
Cisco provides Cisco Connection Online (CCO) as a starting point for all technical assistance. Warranty or maintenance contract customers can use the Technical Assistance Center. All customers can submit technical feedback on Cisco documentation using the web, e-mail, a self-addressed stamped response card included in many printed documents, or by sending mail to Cisco.
Cisco continues to revolutionize how business is done on the Internet. Cisco Connection Online is the foundation of a suite of interactive, networked services that provides immediate, open access to Cisco information and resources at anytime, from anywhere in the world. This highly integrated Internet application is a powerful, easy-to-use tool for doing business with Cisco.
CCO's broad range of features and services helps customers and partners to streamline business processes and improve productivity. Through CCO, you will find information about Cisco and our networking solutions, services, and programs. In addition, you can resolve technical issues with online support services, download and test software packages, and order Cisco learning materials and merchandise. Valuable online skill assessment, training, and certification programs are also available.
Customers and partners can self-register on CCO to obtain additional personalized information and services. Registered users may order products, check on the status of an order and view benefits specific to their relationships with Cisco.
You can access CCO in the following ways:
You can e-mail questions about using CCO to cco-team@cisco.com.
The Cisco Technical Assistance Center (TAC) is available to warranty or maintenance contract customers who need technical assistance with a Cisco product that is under warranty or covered by a maintenance contract.
To display the TAC web site that includes links to technical support information and software upgrades and for requesting TAC support, use www.cisco.com/techsupport.
To contact by e-mail, use one of the following:
Language | E-mail Address |
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In North America, TAC can be reached at 800 553-2447 or 408 526-7209. For other telephone numbers and TAC e-mail addresses worldwide, consult the following web site: http://www.cisco.com/warp/public/687/Directory/DirTAC.shtml.
If you have a CCO log-in account, you can access the following URL, which contains links and tips on configuring your Cisco products:
http://www.cisco.com/kobayashi/technotes/serv_tips.shtml
This URL is subject to change without notice. If it changes, point your Web browser to CCO, press Login, and click on this path: Technical Assistance Center: Technical Tips.
The following sections are provided from the Technical Tips page:
If you are reading Cisco product documentation on the World Wide Web, you can submit technical comments electronically. Click Feedback in the toolbar and select Documentation. After you complete the form, click Submit to send it to Cisco.
You can e-mail your comments to bug-doc@cisco.com.
To submit your comments by mail, for your convenience many documents contain a response card behind the front cover. Otherwise, you can mail your comments to the following address:
Cisco Systems, Inc.
Document Resource Connection
170 West Tasman Drive
San Jose, CA 95134-9883
We appreciate and value your comments.
Posted: Mon Aug 7 20:33:25 PDT 2000
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