Table Of Contents
Configuring SVCs, PVCs, Soft PVCs, PVPs, and VP Tunnels
Configuring SVCs, PVCs, Soft PVCs, PVPs, and VP Tunnels
This chapter describes how to configure switched virtual circuits (SVCs), permanent virtual circuits (PVCs), soft PVCs, permanent virtual paths (PVPs), and virtual path (VP) tunnels, and includes the following sections:
Note
For more software configuration information, refer to the ATM Switch Router Software Configuration Guide and Layer 3 Software Configuration Guide.
Configuring SVCs
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 switch router, no configuration is necessary to set up a transit SVC (an SVC that does not terminate on the 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.
Figure 3-1 Example Network for Configuring SVCs
Configuring the Router
Perform the following tasks on both routers that terminate the SVC:
•
•
•
•
The following subsections describe these procedures in detail.
Tips
Configuring Signaling on the Routers
Configure PVCs for QSAAL and ILMI signaling on the main ATM interfaces of both the source and destination routers that terminate the SVC.
Note
Perform these steps:
Step 1
Switch>enableEnters privileged EXEC mode.
Step 2
Switch#configure terminal
Switch(config)#Enters global configuration mode.
Step 3
Router(config)#interface atmport[/slot]
Router(config-if)#Enters interface configuration mode on the ATM interface.
Step 4
Router(config-if)#atm pvcnumber0 5 qsaalConfigures a PVC for QSAAL1 signaling.
Step 5
Router(config-if)#atm pvcnumber0 16 ilmiConfigures a PVC for ILMI signaling.
Step 6
Router(config-if)#end
Router#Returns to privileged EXEC mode.
Step 7
(No command.)Repeat this procedure on the other router.
1 QSAAL = Q.2931 protocol over signaling ATM adaptation layer
Example
Router> enableRouter# configure terminalEnter configuration commands, one per line. End with CNTL/Z.Router(config)# interface atm 0Router(config-if)# atm pvc 1 0 5 qsaalRouter(config-if)# atm pvc 2 0 16 ilmiRouter(config-if)# endRouter#Verify
Router# show atm vc interface atm 0VCD / Peak Avg/Min BurstInterface Name VPI VCI Type Encaps Kbps Kbps Cells Sts0 1 0 5 PVC SAAL 155000 155000 UP0 2 0 16 PVC ILMI 155000 155000 UPSwitch#Configuring the IP Address and ESI Address
On an ATM subinterface, configure the IP address and an ESI address.
Perform these steps:
Example
Router> enableRouter# configure terminalEnter configuration commands, one per line. End with CNTL/Z.Router(config)# interface atm 0.1 multipointRouter(config-subif)# ip address 193.153.185.33 255.255.255.224 Router(config-subif)# atm esi-address 999999888888.00Router(config-subif)# endRouter#Verify
Router# show interface atm 0.1ATM0.1 is up, line protocol is upHardware is ATMizer BX-50Internet address is 193.153.185.33/27MTU 4470 bytes, BW 155520 Kbit, DLY 100 usec, rely 255/255, load 1/255NSAP address: 47.0091810000000061E5BC01.999999888888.00
Encapsulation ATMRouter#Determining the Switch Address
Determine the ATM network service access point (NSAP) address for both the source and destination routers. The NSAP addresses are required to complete the SVC.
Perform these steps:
Step 1
Router#show interface atmport[/slot][.subinterface]Displays 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:
•
•
Step 2
(No command.)
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.
Table 3-1 NSAP Addresses
Source router1
Destination router2
1 In Figure 3-1, the source router is router A.
2 In Figure 3-1, the destination router is router D.
Example
Switch# show interface atm 0.1ATM0.1 is up, line protocol is upHardware is ATMizer BX-50Internet address is 192.153.185.65/27MTU 4470 bytes, BW 155520 Kbit, DLY 100 usec, rely 255/255, load 1/255Encapsulation ATMSwitch#Configure a Map Group and Map List
On an ATM subinterface, configure the map group and a map list.
Perform these steps:
Step 1
Router>enable
Router#Enters privileged EXEC mode.
Step 2
Router#configure terminal
Router(config)#Enters global configuration mode.
Step 3
Router(config-if)#interface atm 0[/slot].subinterfacemultipointCreates an ATM subinterface and enters subinterface configuration mode.
Step 4
Router(config-subif)#map-groupnameSpecifies the map group name on the ATM subinterface. The map group name is used to associate a map list to the subinterface.
Step 5
Router(config-subif)#no shutdownEnables the interface. Enter this command even if the interface is already up. This command enables the SAR1 process to use the newly configured parameters.
Step 6
Router(config-subif)#exit
Router(config)#Return to global configuration mode.
Step 7
Router(config)#map-listnameCreates 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.
Step 8
Router(config-map-list)#ip dest-ipaddress atm-nsap dest-nsapaddrssAdds 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 Switch Address."
Step 9
Router(config-map-list)#end
Router#Returns to privileged EXEC mode.
Step 10
(No command.)Repeat this procedure on the other router.
1 SAR = Segmentation and Reassembly
Example
Router> enableRouter# configure terminalRouter(config)# interface atm 0.1 multipointRouter(config-subif)# map-group hawaiiRouter(config-subif)# no shutdownRouter(config-subif)# exitRouter(config)# map-list hawaiiRouter(config-map-list)# ip 192.153.185.65 atm-nsap 47.0091810000000061E5B5C01.555555555555.00Router(config-map-list)# endRouter#Verify
Router# ping 192.153.185.65Type 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 msConfiguring PVCs
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.
Figure 3-2 Example Network for Configuring PVCs
When configuring a PVC, the virtual path identifiers (VPIs) and virtual channel identifiers (VCIs) must match between devices, as shown in Figure 3-2:
•
•
•
The VPI and VCIs that create an internal crossconnect within a switch can differ, as shown in Figure 3-2:
•
•
Table 3-2 describes the in and out interfaces and associated VPIs/VCIs for the PVC shown in Figure 3-2.
Configuring the Switch Router
Perform these steps:
Note
Switch(config-if)# atm pvc 2 100 interface atm 0 0 any-vci
Example
The following example shows how to configure the internal crossconnect (within the switch) PVC on 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> enableSwitch# configure terminalSwitch(config)# interface atm 3/0/1Switch(config-if)# atm pvc 0 50 interface atm 3/0/2 2 100Switch(config-if)# endSwitch#Verify
Switch# show atm vc interface atm 3/0/1Interface VPI VCI Type X-Interface X-VPI X-VCI Encap StatusATM3/0/1 0 5 PVC ATM0 0 55 QSAAL UPATM3/0/1 0 16 PVC ATM0 0 39 ILMI UPATM3/0/1 0 18 PVC ATM0 0 74 PNNI UPATM3/0/1 0 50 PVC ATM3/0/2 2 100 UPSwitch#Configuring the Router
If the PVC terminates on a router, you must configure a PVC from the router to the switch router.
Perform these steps:
Step 1
Router>enable
Router#Enters privileged EXEC mode.
Step 2
Router#configure terminal
Router(config)#Enters global configuration mode.
Step 3
Router(config)#interface atmport[/slot].subinterface
Router(config-subif)#Enters subinterface configuration mode on the main ATM interface.
Step 4
Router(config-subif)#ip address address maskConfigures an IP address and subnet mask on the subinterface.
Step 5
Router(config-subif)#atm pvcvcd vpi vci aal-encapCreates the PVC.
Note
Step 6
Router(config-subif)#map-groupnameAssigns a map group to this interface. This command references a map list that you create in the next step.
Step 7
Router(config-subif)#exit
Router(config)#Returns to global configuration mode.
Step 8
Router(config)#map-list nameCreates a map list. Match the name you enter here to the name in Step 6.
Step 9
Router(config-map-list)# ipdest-address atm-vc vcdbroadcastAdds 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.
Step 10
Router(config-map-list)#end
Router#Returns to privileged EXEC mode.
Step 11
(No command.)Repeat this procedure on the other router.
1 VCD = virtual circuit descriptor
Example
Router> enableRouter# configure terminalRouter(config)# interface atm 0.10 multipointRouter(config-subif)# ip address 192.153.185.33 255.255.255.224 (source router)Router(config-subif)# atm pvc 2 0 50 aal5snapRouter(config-subif)# map-group calRouter(config-subif)# exitRouter(config)# map-list calRouter(config-map-list)# ip 192.153.185.65 atm-vc 2 broadcast (destination router)Router(config-map-list)# endRouter#Verify
Router# ping 192.153.185.65Type 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 msConfiguring Soft PVCs
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 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 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.
Figure 3-3 Example Network for Configuring Soft PVCs
Configuring the Switch Router
Perform the following tasks on the switch router to set up a soft PVC:
•
•
The subsections that follow describe these procedures in detail.
Determining the Destination Switch Router NSAP Address
Determine the destination switch router NSAP address for the interface. See switch router C in Figure 3-3.
Perform these steps:
Step 1
Switch#show atm addressesOn the destination switch router, displays the destination ATM address. You need this address to complete the soft PVC. Write the address in the space provided here in this table (or copy it to memory).
Step 2
(No command.)Proceed to the next section, " Configuring the Source Switch Router," to complete the soft PVC.
Example
Switch# show atm addressSwitch Address(es):47.00918100000000E04FACB401.00E04FACB401.00 activeSoft VC Address(es):47.0091.8100.0000.00e0.4fac.b401.4000.0c84.9030.00 ATM-P9/1/347.0091.8100.0000.00e0.4fac.b401.4000.0c85.0020.00 ATM0/1/047.0091.8100.0000.00e0.4fac.b401.4000.0c85.0030.00 ATM0/1/1ILMI Switch Prefix(es):47.0091.8100.0000.00e0.4fac.b401ILMI Configured Interface Prefix(es):LECS Address(es):47.0091.8100.0000.00e0.4fac.b401.00e0.4fac.b405.00Switch#Configuring the Source Switch Router
Most of the configuration for the soft PVC occurs on the source switch. See the switch router B in Figure 3-3.
Perform these steps:
Step 1
Switch#configure terminal
Switch(config)#Enters global configuration mode.
Step 2
Switch(config)#interface atmcard/subcard/port
Switch(config-if)#Enters interface configuration mode on the interface from which you want the soft PVC to originate (that is, the starting point).
Step 3
Switch(config-if)#atm soft-vc src-vpi src-vcidest-address dest-address dest-vpi dest-vciEnters the soft PVC VPI/VCIs for the interface on the source switch and the destination ATM address and destination VPI/VCIs.
Step 4
Switch(config-if)#end
Switch#Returns to privileged EXEC mode.
Step 5
(No command.)Proceed to the section "Configuring the Router" to complete the soft PVC.
Example
Switch# configure terminalSwitch(config)# interface atm 3/0/1Switch(config-if)# atm soft-vc 0 50 dest-address 47.0091.8100.0000.0061.E5BC.0000.1111.11122.2222.00 1 60Switch(config-if)# endSwitch#Verify
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 0/0/0Interface VPI VCI Type X-Interface X-VPI X-VCI Encap StatusATM0/0/0 0 5 PVC ATM0 0 52 QSAAL DOWNATM0/0/0 0 16 PVC ATM0 0 32 ILMI DOWNATM3/0/1 0 50 SoftVC ATM0/0/1 1 60 UPSwitch#Configuring the Router
If the soft PVC terminates on a router, you must configure a PVC from the router to the switch router.
Perform these steps:
Example
Router> enableRouter# configure terminalRouter(config)# interface atm 0.10Router(config-subif)# ip address 192.153.185.33 255.255.255.224 (source router)Router(config-subif)# atm pvc 2 0 50 aal5snapRouter(config-subif)# map-group calRouter(config-subif)# exitRouter(config)# map-list calRouter(config-map-list)# ip 192.153.185.65 atm-vc 2 broadcast (destination router)Router(config-map-list)# endRouter#Verify
Router# ping 192.153.185.65Type 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 msConfiguring PVPs
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 permanent VP (like a PVC).
Figure 3-4 illustrates how to set up PVPs. This example network is used throughout this section.
Figure 3-4 Example Network for Configuring PVPs
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).
Note
Table 3-3 Example PVP Interfaces and VPIs
3/0/2
0/0/0
1/1/1
3/1/1
1/0/0
0/1/1
3
3
5
5
8
8
Perform these steps:
Example
The following example shows how to configure the internal crossconnect (within the switch router) PVP on switch router B between interface 3/0/1, VPI = 2 and interface 3/0/2, VPI = 3:
Switch> enableSwitch# configure terminalEnter configuration commands, one per line. End with CNTL/Z.Switch(config)# interface atm 3/0/1Switch(config-if)# atm pvp 2 interface atm 3/0/2 3Switch(config-if)# endSwitch#Verify
Switch# show atm vpInterface VPI Type X-Interface X-VPI StatusATM3/0/1 2 PVP ATM3/0/2 3 UPATM3/0/2 3 PVP ATM3/0/1 2 UPSwitch#Configuring VP Tunnels
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.
Figure 3-5 Example Network for Configuring VP Tunnels
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.
Table 3-4 Example VP Tunnel Interfaces and VPIs/VPTs
3/0/2.99
0/0/0.99
99
99
99
99
Perform these steps:
Example
The following example shows how to configure the VP tunnel on VPI = 99.
Switch> enableSwitch# configure terminalEnter configuration commands, one per line. End with CNTL/Z.Switch(config)# interface atm 3/0/2Switch(config-if)# atm pvp 99Switch(config-if)# interface atm 3/0/2.99Switch(config-subif)# endSwitch#Verify
When the VP tunnel is configured on both ends and the connection is up, the AutoCfgState displays "completed."
Switch# show atm interface atm 3/0/2.99Interface: ATM3/0/2.99 Port-type: vp tunnelIF Status: UP Admin Status: upIF-Side: Network IF-type: NNIUni-type: not applicable Uni-version: not applicable<Information deleted>Switch#Switch# show atm vpInterface VPI Type X-Interface X-VPI StatusATM3/0/2 99 PVP TUNNELSwitch#
