A service provider normally gives you one or more virtual path (VP) tunnels to connect your devices together instead of a point-to-point physical link. This document explains the steps necessary to configure Multiprotocol Label Switching (MPLS) when you use VP tunnels.
There are no specific requirements for this document.
Refer to Cisco Technical Tips Conventions for more information on document conventions.
In this section, you are presented with the information to configure the features described in this document.
This document uses this network setup:
In this setup, the service provider has furnished two VP tunnels:
One between Ischia and Capri with VPI = 3 (virtual path identifier)
One between Alcazaba and Capri with VPI = 4
Ischia and Alcazaba are two Cisco 7200 routers that run Cisco IOS® Software Release 12.1(3a)E. Capri is a Catalyst 8540 Multiservice Switch Router (MSR) that runs release 12.0(10)W5(18c). Capri is a Tag Distribution Protocol (TDP) neighbor of Alcazaba and Ischia.
Note: You must run release 12.0(3)T or higher in order to configure this feature.
The configurations used here are for a Catalyst 8500 MSR, or LightStream 1010, and a router.
This document uses these configurations:
ip cef ! interface Loopback0 ip address 18.104.22.168 255.255.255.0 ! interface ATM2/0.3 tag-switching ip address 22.214.171.124 255.255.255.0 tag-switching atm vp-tunnel 3 tag-switching ip ! router ospf 6 log-adjacency-changes network 126.96.36.199 0.0.0.0 area 0 network 188.8.131.52 0.0.0.255 area 0
ip cef ! interface Loopback0 ip address 184.108.40.206 255.255.255.0 ! interface ATM4/0.4 tag-switching ip address 220.127.116.11 255.255.255.0 tag-switching atm vp-tunnel 4 tag-switching ip ! router ospf 6 log-adjacency-changes network 18.104.22.168 0.0.0.0 area 0 network 22.214.171.124 0.0.0.255 area 0
interface ATM3/1/1 no ip address no ip directed-broadcast no ip mroute-cache no atm ilmi-keepalive atm pvp 3 atm pvp 4 ! interface ATM3/1/1.3 point-to-point ip address 126.96.36.199 255.255.255.0 no ip directed-broadcast no atm ilmi-keepalive tag-switching ip ! interface ATM3/1/1.4 point-to-point ip address 188.8.131.52 255.255.255.0 no ip directed-broadcast no atm ilmi-keepalive tag-switching ip
Note: This configuration is similar to standard router configurations you can find here. The only difference is that you have to specify to the router that you use a VP tunnel. You can do this with the tag-switching atm vp-tunnel vpi command, where vpi is the VPI value that is associated with the tunnel that ends on this router.
Note: For the LightStream 1010 and Catalyst 8500 MSR, you need to configure one or more permanent virtual paths (PVPs) for each VP tunnel with the atm pvp vpi command. See here for a sample configuration. A subinterface is associated with each of these tunnels. For instance, the atm 3/1/1.3 interface is associated with PVP=3. You must configure this subinterface with tag-switching, as you do on the main interface.
Use these tag-switching show commands to test that your network operates properly:
show tag-switching tdp neighbor
show tag-switching atm-tdp bindings — This shows dynamic ATM tag information.
show tag-switching forwarding-table — This shows the Tag Forwarding Information Base (TFIB).
show tag-switching interfaces atm [int number] detail — This shows detailed tag switching information for each interface.
This output is a result of these commands entered on the devices shown in the network diagram.
Ischia#show tag-switching tdp neighbor Peer TDP Ident: 10.200.10.57:1; Local TDP Ident 184.108.40.206:1 TCP connection: 220.127.116.11.11001 - 18.104.22.168.711 State: Oper; PIEs sent/rcvd: 92/93; ; Downstream on demand Up time: 01:16:52 TDP discovery sources: ATM2/0.3 Ischia#show tag-switching atm-tdp bindings Destination: 22.214.171.124/24 Headend Router ATM2/0.3 (1 hop) 3/33 Active, VCD=127 Destination: 126.96.36.199/24 Tailend Router ATM2/0.3 3/33 Active, VCD=127 Destination: 188.8.131.52/32 Headend Router ATM2/0.3 (2 hops) 3/34 Active, VCD=128 Ischia#show tag-switching forwarding-table Local Outgoing Prefix Bytes tag Outgoing Next Hop tag tag or VC or Tunnel Id switched interface 26 3/33 184.108.40.206/24 0 AT2/0.3 point2point 27 3/34 220.127.116.11/32 0 AT2/0.3 point2point Ischia#show tag-switching interfaces detail Interface ATM2/0.3: IP tagging enabled TSP Tunnel tagging not enabled Tagging operational Tagswitching turbo vector MTU = 4470 ATM tagging: Tag VPI = 3 (VP Tunnel) Tag VCI range = 33 - 65535 Control VC = 3/32 Capri#show tag-switching atm-tdp bindings Destination: 18.104.22.168/24 Tailend Switch ATM3/1/1.3 3/33 Active -> Terminating Active Destination: 22.214.171.124/32 Transit ATM3/1/1.4 4/33 Active -> ATM3/1/1.3 3/33 Active Destination: 126.96.36.199/24 Tailend Switch ATM3/1/1.4 4/34 Active -> Terminating Active Destination: 188.8.131.52/32 Transit ATM3/1/1.3 3/34 Active -> ATM3/1/1.4 4/33 Active Capri#show tag-switching tdp neighbor Peer TDP Ident: 184.108.40.206:1; Local TDP Ident 10.200.10.57:1 TCP connection: 220.127.116.11.711 - 18.104.22.168.11001 State: Oper; PIEs sent/rcvd: 95/94; ; Downstream on demand Up time: 01:18:49 TDP discovery sources: ATM3/1/1.3 Peer TDP Ident: 22.214.171.124:1; Local TDP Ident 10.200.10.57:2 TCP connection: 126.96.36.199.711 - 188.8.131.52.11002 State: Oper; PIEs sent/rcvd: 93/95; ; Downstream on demand Up time: 01:18:22 TDP discovery sources: ATM3/1/1.4 Capri#show tag-switching interfaces detail Interface ATM3/1/1.3: IP tagging enabled TSP Tunnel tagging not enabled Tagging operational MTU = 4470 ATM tagging: Tag VPI = 3, Control VC = 3/32 Interface ATM3/1/1.4: IP tagging enabled TSP Tunnel tagging not enabled Tagging operational MTU = 4470 ATM tagging: Tag VPI = 4, Control VC = 4/32
This output is similar to standard tag-switching output, but one important difference is that it points to the VP tunnel interface.
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