|
|
This chapter describes how to configure switched virtual circuits (SVCs), permanent virtual circuits (PVCs), soft PVCs, permanent virtual paths (PVPs), and VP tunnels, and includes the following sections:
An SVC is a logical connection established using signaling messages, which reduces the amount of manual configuration required. SVCs are established on demand and torn down when a release message is generated either by signaling messages or by the application.
On the ATM switch router, no configuration is necessary to set up a transit SVC (an SVC that does not terminate on the ATM switch router). The signaling channels are set up by default and do not require manual configuration.
If the SVC terminates on a router, however, configuration is required on the router where the SVC terminates. For your convenience, the router configuration is described in this section.
Figure 3-1 shows an example network that illustrates how to set up SVCs. This example network is used throughout this section.
Perform the following tasks on both routers that terminate the SVC:
The following subsections describe these procedures in detail.
 | Tips Open two Telnet windows for both the source and destination routers. |
Configure PVCs for QSAAL and ILMI signaling on the main ATM interfaces of both the source and destination routers that terminate the SVC.
Take these steps:
| Step | Command | Purpose |
|---|---|---|
| 1 | | Enter privileged EXEC mode. |
| 2 | | Enter global configuration mode. |
| 3 | | Enter interface configuration mode on the ATM interface. |
| 4 | | Configure a PVC for QSAAL1 signaling. |
| 5 | | Configure a PVC for ILMI signaling. |
| 6 | | Return to privileged EXEC mode. |
| 7 | | Repeat this procedure on the other router. |
| 1QSAAL = Q.2931 protocol over signaling ATM adaptation layer |
Router> enable Router# configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router(config)# interface atm 0 Router(config-if)# atm pvc 1 0 5 qsaal Router(config-if)# atm pvc 2 0 16 ilmi Router(config-if)# end Router#
Switch# show atm vc interface atm 0 VCD / Peak Avg/Min Burst Interface Name VPI VCI Type Encaps Kbps Kbps Cells Sts 0 1 0 5 PVC SAAL 155000 155000 UP 0 2 0 16 PVC ILMI 155000 155000 UP Switch#
On an ATM subinterface, configure the IP address and an ESI address.
Take these steps:
| Step | Command | Purpose |
|---|---|---|
| 1 | | Enter privileged EXEC mode. |
| 2 | | Enter global configuration mode. |
| 3 | | Configure an ATM subinterface. |
| 4 | | Configure an IP address on the subinterface. |
| 5 | | Configure a 14-digit ESI address on the subinterface (for example, 111111222222.00). After ILMI address registration is complete, an NSAP address is automatically created based on the ESI address you entered. |
| 6 | | Return to privileged EXEC mode. |
| 7 | | Repeat this procedure on the other router. |
Router> enable Router# configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router(config)# interface atm 0.1 multipoint Router(config-subif)# ip address 193.153.185.33 255.255.255.224 Router(config-subif)# atm esi-address 999999888888.00 Router(config-subif)# end Router#
Switch# show interface atm 0.1 ATM0.1 is up, line protocol is up Hardware is ATMizer BX-50 Internet address is 193.153.185.33/27 MTU 4470 bytes, BW 155520 Kbit, DLY 100 usec, rely 255/255, load 1/255
NSAP address: 47.0091810000000061E5BC01.999999888888.00 Encapsulation ATM Switch#
Determine the ATM network service access point (NSAP) address for both the source and destination routers. The NSAP addresses is required to complete the SVC.
| Step | Command | Purpose |
|---|---|---|
| 1 | | Display the 20-byte NSAP address of the router port on which the SVC terminates. Enter the address in Table 3-1. The NSAP address does not display in certain modes. In this case, you must enter an NSAP address that meets the following criteria:
|
| 2 | | Repeat this procedure to display the NSAP address of the other router. |
Enter the 20-byte NSAP address of each router in the space provided below in Table 3-1.
| Router | NSAP Address |
|---|---|
Source router1 |
|
Destination router2 |
|
| 1In Figure 3-1, the source router is router A. 2In Figure 3-1, the destination router is router D. |
Switch# show interface atm 0.1 ATM0.1 is up, line protocol is up Hardware is ATMizer BX-50 Internet address is 192.153.185.65/27 MTU 4470 bytes, BW 155520 Kbit, DLY 100 usec, rely 255/255, load 1/255
NSAP address: 47.0091810000000061E5B5C01.555555555555.00 Encapsulation ATM Switch#
Not applicable.
On an ATM subinterface, configure the map group and a map list.
Take these steps:
| Step | Command | Purpose |
|---|---|---|
| 1 | | Enter privileged EXEC mode. |
| 2 | | Enter global configuration mode. |
| 3 | | Configure an ATM subinterface. |
| 4 | | Enter the map group name on the ATM subinterface. The map group name is used to associate a map list to the subinterface. |
| 5 | | Enable the interface. Enter this command even if the interface is already up. This command enables the SAR1 process to use the newly configured parameters. |
| 6 | | Return to global configuration mode. |
| 7 | | Create a map list to define an ATM map statement for the SVC. The name you enter here must match the map group name you specified in Step 4. |
| 8 | | Add the destination router IP address and ATM NSAP address to the map list. Enter the addresses you noted in Table 3-1 in the section "Determining the NSAP Address." |
| 9 | | Return to privileged EXEC mode. |
| 10 | | Repeat this procedure on the other router. |
| 1SAR = Segmentation and Reassembly. |
Router> enable Router# configure terminal Router(config)# interface atm 0.1 multipoint Router(config-subif)# map-group hawaii Router(config-subif)# no shutdown Router(config-subif)# exit Router(config)# map-list hawaii Router(config-map-list)# ip 192.153.185.65 atm-nsap 47.0091810000000061E5B5C01.555555555555.00 Router(config-map-list)# end Router#
Router# ping 192.153.185.65 Type escape sequence to abort. Sending 5, 100-byte ICMP Echoes to 192.153.185.65, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms
A PVC is a permanent logical connection that you must configure manually, from source to destination, through the ATM network. Once configured, the ATM network maintains the connection at all times, regardless of traffic flow. That is, the connection is always up whether there is traffic to send or not.
Figure 3-2 shows an example PVC between ATM-capable router A and router D. This example network is used throughout this section to describe how to set up PVCs.
When configuring a PVC, the virtual path identifiers/virtual channel identifiers (VPIs/VCIs) must match between devices, as shown in Figure 3-2 between:
The VPI/VCIs that create an internal crossconnect within a switch can differ, as shown in:
Table 3-2 describes the in and out interfaces and associated VPIs/VCIs for the PVC shown in Figure 3-2.
| Router A | Switch B | Switch B | Switch C | Switch C | Router D | |
|---|---|---|---|---|---|---|
| Out | In | Out | In | Out | In | |
| Interface | 0.10 | 3/0/1 | 3/0/2 | 0/1/1 | 0/0/1 | 0.12 |
| VPI/VCI | 0/50 | 0/50 | 2/100 | 2/100 | 50/255 | 50/255 |
Take these steps:
| Step | Command | Purpose |
|---|---|---|
| 1 | | Enter privileged EXEC mode. |
| 2 | | Enter global configuration mode. |
| 3 | | Select the interface to configure. |
| 4 | | Configure the PVC. When configuring PVCs, configure the lowest available VPI and VCI numbers first. Note VCIs 0 to 31 on all VPIs are reserved. |
| 5 | | Return to privileged EXEC mode. |
The following example shows how to configure the internal crossconnect (within the switch) PVC on ATM switch router B between interface 3/0/1, VPI = 0, VCI = 50, and interface 3/0/2, VPI = 2, VCI = 100 (see Figure 3-2):
Switch> enable Switch# configure terminal Switch(config)# interface atm 3/0/1 Switch(config-if)# atm pvc 0 50 interface atm 3/0/2 2 100 Switch(config-if)# end Switch#
Switch# show atm vc interface atm 3/0/1 Interface VPI VCI Type X-Interface X-VPI X-VCI Encap Status ATM3/0/1 0 5 PVC ATM0 0 55 QSAAL UP ATM3/0/1 0 16 PVC ATM0 0 39 ILMI UP ATM3/0/1 0 18 PVC ATM0 0 74 PNNI UP ATM3/0/1 0 50 PVC ATM3/0/2 2 100 UP Switch#
If the PVC terminates on a router, you must configure a PVC from the router to the ATM switch router.
Take these steps:
| Step | Command | Purpose |
|---|---|---|
| 1 | | Enter privileged EXEC mode. |
| 2 | | Enter global configuration mode. |
| 3 | | Enter subinterface configuration mode on the main ATM interface. |
| 4 | | Configure an IP address and subnet mask on the subinterface. |
| 5 | | Create the PVC. Note VCIs 0 to 31 on all VPIs are reserved. |
| 6 | | Assign a map group to this interface. This command references a map list that you create in the next step. |
| 7 | | Return to global configuration mode. |
| 8 | | Create a map list. Match the name you enter here to the name in Step 6. |
| 9 | | Add the destination router IP address. The VCD1 number must match the VCD number you assigned in Step 5. This configuration allows the VC to receive routing updates. |
| 10 | | Return to privileged EXEC mode. |
| 11 | | Repeat this procedure on the other router. |
| 1VCD = virtual circuit descriptor. |
Router> enable Router# configure terminal Router(config)# interface atm 0.10 multipoint Router(config-subif)# ip address 192.153.185.33 255.255.255.224 (source router) Router(config-subif)# atm pvc 2 0 50 aal5snap Router(config-subif)# map-group cal Router(config-subif)# exit Router(config)# map-list cal Router(config-map-list)# ip 192.153.185.65 atm-vc 2 broadcast (destination router) Router(config-map-list)# end Router#
Router# ping 192.153.185.65 Type escape sequence to abort. Sending 5, 100-byte ICMP Echoes to 192.153.185.65, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/1 ms
Soft PVCs are a combination of SVCs and PVCs. SVCs are set up on the inside of the path among ATM switch routers, and PVCs are set up between an edge ATM switch router and the terminating device (such as a router).
Soft PVCs require less manual configuration than PVCs. With soft PVCs, you need to configure only the destination ATM switch router in the path and PVCs on the devices that terminate the soft PVC (such as a router).
Figure 3-3 illustrates how to set up soft PVCs. This example network is used throughout this section.
Perform the following tasks on the ATM switch router to set up a soft PVC:
The subsections that follow describe these procedures in detail.
Determine the destination ATM switch router NSAP address for the interface. See the ATM switch router C in Figure 3-3.
Take these steps:
| Step | Command | Purpose |
|---|---|---|
| 1 | | On the destination ATM switch router, display the destination ATM address. You need this address to complete the soft PVC. Write the address in the space provided below (or copy it to memory): |
| 2 | | Proceed to the next section, "Configuring the Source ATM Switch Router" to complete the soft PVC. |
Switch# show atm address Switch Address(es): 47.00918100000000E04FACB401.00E04FACB401.00 active Soft VC Address(es): 47.0091.8100.0000.00e0.4fac.b401.4000.0c84.9030.00 ATM-P9/1/3
47.0091.8100.0000.0061.E5B5.C011.1111.1122.2222.00 ATM0/0/1 47.0091.8100.0000.00e0.4fac.b401.4000.0c85.0020.00 ATM0/1/0 47.0091.8100.0000.00e0.4fac.b401.4000.0c85.0030.00 ATM0/1/1 ILMI Switch Prefix(es): 47.0091.8100.0000.00e0.4fac.b401 ILMI Configured Interface Prefix(es): LECS Address(es): 47.0091.8100.0000.00e0.4fac.b401.00e0.4fac.b405.00 Switch#
Not applicable.
Most of the configuration for the soft PVC occurs on the source switch. See the ATM switch router B in Figure 3-3.
Take these steps:
| Step | Command | Purpose |
|---|---|---|
| 1 | | Enter global configuration mode. |
| 2 | | Enter interface configuration mode on the interface from which you want the soft PVC to originate (that is, the starting point). |
| 3 | | Enter the soft PVC VPI/VCIs for the interface on the source switch and the destination ATM address and destination VPI/VCIs. |
| 4 | | Return to privileged EXEC mode. |
| 5 | | Proceed to the section "Configuring the Router" to complete the soft PVC. |
Switch# configure terminal Switch(config)# interface atm 3/0/1 Switch(config-if)# atm soft-vc 0 50 dest-address 47.0091.8100.0000.0061.E5BC.0000.1111.11122.2222.00 1 60 Switch(config-if)# end Switch#
The following example displays the soft VC configuration of switch B, on interface 3/0/1 out to the ATM network:
Switch# show atm vc interface atm 0/0/0 Interface VPI VCI Type X-Interface X-VPI X-VCI Encap Status ATM0/0/0 0 5 PVC ATM0 0 52 QSAAL DOWN ATM0/0/0 0 16 PVC ATM0 0 32 ILMI DOWN ATM3/0/1 0 50SoftVC ATM0/0/1 1 60 UP Switch#
If the soft PVC terminates on a router, you must configure a PVC from the router to the ATM switch router.
Take these steps:
| Step | Command | Purpose |
|---|---|---|
| 1 | | Enter privileged EXEC mode. |
| 2 | | Enter global configuration mode. |
| 3 | | Enter subinterface configuration mode on the ATM interface. |
| 4 | | Configure an IP address and subnet mask on the subinterface. |
| 5 | | Create the PVC. Note VCIs 0 to 31 on all VPIs are reserved. |
| 6 | | Assign a map group to this interface. This command references a map list that you create in the next step. |
| 7 | | Return to global configuration mode. |
| 8 | | Create a map list. The name you enter here should match the name you specified in Step 6. |
| 9 | | Add the destination router IP address. The VCD number must match the VCD number you assigned in Step 5. |
| 10 | | Return to privileged EXEC mode. |
| 11 | | Repeat this procedure on the other router. |
Router> enable Router# configure terminal Router(config)# interface atm 0.10 Router(config-subif)# ip address 192.153.185.33 255.255.255.224 (source router) Router(config-subif)# atm pvc 2 0 50 aal5snap Router(config-subif)# map-group cal Router(config-subif)# exit Router(config)# map-list cal Router(config-map-list)# ip 192.153.185.65 atm-vc 2 broadcast (destination router) Router(config-map-list)# end Router#
Router# ping 192.153.185.65 Type escape sequence to abort. Sending 5, 100-byte ICMP Echoes to 192.153.185.65, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/1 ms
A VP connection is like a bundle of VCs, transporting all cells with a common VPI, rather than a specific VPI and VCI. A PVP is a provisioned VP (like a PVC).
Figure 3-4 illustrates how to set up PVPs. This example network is used throughout this section.
Table 3-3 describes the in and out interfaces and associated VPIs for the PVP shown in Figure 3-4. Between ATM switch routers, the VPIs for the out port and the in port must match. For example, in Figure 3-4, the VPIs match between ATM switch routers A and B (VPI=3).
| Switch A | Switch B | Switch B | Switch C | Switch C | Switch D | |
|---|---|---|---|---|---|---|
| Out | In | Out | In | Out | In | |
| Interface | 3/0/2 | 0/0/0 | 1/1/1 | 3/1/1 | 1/0/0 | 0/1/1 |
| VPI | 3 | 3 | 5 | 5 | 8 | 8 |
Take these steps:
| Step | Command | Purpose |
|---|---|---|
| 1 | | Enter privileged EXEC mode. |
| 2 | | Enter global configuration mode. |
| 3 | | Enter interface configuration mode on the ATM interface. |
| 4 | | Configure the PVP. Note When configuring PVP connections, use the lowest available VPI numbers first. |
| 5 | | Return to privileged EXEC mode. |
The following example shows how to configure the internal crossconnect (within the switch) PVP on ATM switch router B between interface 3/0/1, VPI = 2 and interface 3/0/2, VPI = 3:
Switch# configure terminal Enter configuration commands, one per line. End with CNTL/Z. Switch(config)# interface atm 3/0/1 Switch(config-if)# atm pvp 2 interface atm 3/0/2 3 Switch(config-if)# end Switch#
Switch# show atm vp Interface VPI Type X-Interface X-VPI Status ATM3/0/1 2 PVP ATM3/0/2 3 UP ATM3/0/2 3 PVP ATM3/0/1 2 UP Switch#
A VP tunnel is a method of linking two private ATM networks across a public network that does not support SVCs. The VP tunnel provides a permanent path through the public network. The public network transparently trunks the entire collection of virtual channels in the virtual path between the two private networks. Signaling traffic is mapped into the PVP and the switches allocate a virtual channel connection (VCC) on that VP, instead of the default VP 0. This mapping allows the signaling traffic to pass transparently through the public network.
Figure 3-5 illustrates how to set up VP tunnels. This example network is used throughout this section.
Table 3-4 describes the interfaces and associated VPIs and VPTs for the VP tunnel shown in Figure 3-5. Between the source and destination ATM switch routers, the VPIs and VPTs must match. For example, in Figure 3-5, the VPIs and VPTs (99) match between ATM switch routers A and B.
| Switch A | Switch B | |
|---|---|---|
| Interface | 3/0/2.99 | 0/0/0.99 |
| VPI | 99 | 99 |
| VPT | 99 | 99 |
Take these steps:
| Step | Command | Purpose |
|---|---|---|
| 1 | | Enter privileged EXEC mode. |
| 2 | | Enter global configuration mode. |
| 3 | | Enter interface configuration mode on the ATM interface. |
| 4 | | Configure a PVP leg. |
| 5 | | Create a VP tunnel using a VPT number that matches the PVP leg VPI you configured in Step 4. |
| 6 | | Return to privileged EXEC mode. |
| 7 | | Repeat this procedure on the other ATM switch router. |
The following example shows how to configure the VP tunnel on VPI=99.
Switch# configure terminal Enter configuration commands, one per line. End with CNTL/Z. Switch(config)# interface atm 3/0/2 Switch(config-if)# atm pvp 99 Switch(config-if)# interface atm 3/0/2.99 Switch(config-subif)# end Switch#
When the VP tunnel is configured on both ends and the connection is up, the AutoCfgState displays "completed."
Switch# show atm interface atm 3/0/2.99 Interface: ATM3/0/2.99 Port-type: vp tunnel IF Status: UP Admin Status: up
Auto-config: enabled AutoCfgState: completed IF-Side: Network IF-type: NNI Uni-type: not applicable Uni-version: not applicable <Information omitted.> Switch# Switch# show atm vp Interface VPI Type X-Interface X-VPI Status ATM3/0/2 99 PVP TUNNEL Switch#
Posted: Mon Aug 16 14:27:43 PDT 1999
Copyright 1989-1999©Cisco Systems Inc.