Document ID: 10467
Updated: Nov 15, 2007
Contents
Introduction
This document illustrates a Multiprotocol Label Switching (MPLS) network with ATM. Since VC-merge is not used, there is one VC allocated per route as determined by the prefix in the routing table.
Prerequisites
Requirements
There are no specific requirements for this document.
Components Used
The information in this document is based on these software and hardware versions:
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Cisco IOS® Software Release 12.0 or later is for MPLS on Guilder and Damme.
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This setup uses one ATM switch that is used as the label switch router (LSR). In this example, it is a Catalyst 8540MSR. It can also be a LS1010. Cisco recommends software version WA4.8d or later on the LS1010. Any software on the 8540MSR is sufficient.
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Cisco Express Forwarding (CEF) needs to be enabled on the routers that run MPLS/Tag switching. In this example, Guilder and Damme are Cisco 3600s. If a 7500 is used, ip cef distributed must be enabled.
Note: Although not a requirement, this document uses VPI 2, 3, or 4 for all Tag VCs in this example.
The information in this document was created from the devices in a specific lab environment. All of the devices used in this document started with a cleared (default) configuration. If your network is live, make sure that you understand the potential impact of any command.
Conventions
For more information on document conventions, refer to the Cisco Technical Tips Conventions.
Configure
In this section, you are presented with the information to configure the features described in this document.
Note: To find additional information on the commands used in this document, use the Command Lookup Tool (registered customers only) .
Network Diagram
This document uses this network setup:
Note: Loopback interfaces have been set on all routers/LSRs. They are not shown in the network diagram for the sake of simplicity.
Configurations
This document uses these configurations:
| Pound |
|---|
! interface Loopback0 ip address 100.100.0.1 255.255.0.0 no ip directed-broadcast ! interface Ethernet0/1 ip address 123.123.0.2 255.255.0.0 no ip directed-broadcast ! router ospf 1 network 100.100.0.0 0.0.255.255 area 1.1.1.1 network 123.123.0.0 0.0.255.255 area 1.1.1.1 ! |
| Guilder |
|---|
! ip cef ! interface Loopback0 ip address 102.102.0.1 255.255.0.0 no ip directed-broadcast ! interface Ethernet0/1 ip address 123.123.0.1 255.255.0.0 no ip directed-broadcast ! interface ATM1/0 no ip address no ip directed-broadcast no atm ilmi-keepalive ! interface ATM1/0.1 tag-switching ip address 129.129.0.1 255.255.0.0 no ip directed-broadcast tag-switching atm vpi 2-4 tag-switching ip ! router ospf 1 network 102.102.0.0 0.0.255.255 area 0.0.0.0 network 123.123.0.0 0.0.255.255 area 1.1.1.1 network 129.129.0.0 0.0.255.255 area 0.0.0.0 ! |
| Capri (8540MSR) |
|---|
! interface Loopback0 ip address 103.103.0.1 255.255.0.0 no ip directed-broadcast ! interface ATM3/0/0 ip address 128.128.0.2 255.255.0.0 no ip directed-broadcast no ip route-cache cef no atm ilmi-keepalive tag-switching atm vpi 2-4 tag-switching ip ! interface ATM3/0/3 ip address 129.129.0.2 255.255.0.0 no ip directed-broadcast no ip route-cache cef no atm ilmi-keepalive tag-switching atm vpi 2-4 tag-switching ip ! router ospf 1 network 103.103.0.0 0.0.255.255 area 0.0.0.0 network 128.128.0.0 0.0.255.255 area 0.0.0.0 network 129.129.0.0 0.0.255.255 area 0.0.0.0 ! |
| Damme |
|---|
! ip cef ! interface Loopback0 ip address 104.104.0.1 255.255.0.0 no ip directed-broadcast ! interface FastEthernet0/0 ip address 125.125.0.1 255.255.0.0 no ip directed-broadcast duplex auto speed 10 tag-switching ip ! interface ATM1/0 no ip address no ip directed-broadcast no atm ilmi-keepalive pvc 0/16 ilmi ! pvc 0/5 qsaal ! ! interface ATM1/0.2 tag-switching ip address 128.128.0.1 255.255.0.0 no ip directed-broadcast tag-switching atm vpi 2-4 tag-switching ip ! router ospf 1 network 104.104.0.0 0.0.255.255 area 0.0.0.0 network 125.125.0.0 0.0.255.255 area 2.2.2.2 network 128.128.0.0 0.0.255.255 area 0.0.0.0 ! |
| Lira |
|---|
! interface Loopback0 ip address 101.101.0.1 255.255.0.0 no ip directed-broadcast ! interface Ethernet0/0 ip address 125.125.0.2 255.255.0.0 no ip directed-broadcast ! router ospf 1 network 101.101.0.0 0.0.255.255 area 2.2.2.2 network 125.125.0.0 0.0.255.255 area 2.2.2.2 ! |
Verify
This section provides information you can use to confirm your configuration is working properly.
Certain show commands are supported by the Output Interpreter Tool (registered customers only) , which allows you to view an analysis of show command output.
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show tag-switching forwarding-table—Shows the Tag Forwarding Information Base (TFIB).
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show tag-switching atm-tdp bindings—Shows dynamic ATM tagging information.
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show tag-switching int atm [int number] detail—Shows detailed per-interface tag switching information.
This output shows that the routing table is complete on Guilder:
Guilder#show ip route
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area
* - candidate default, U - per-user static route, o - ODR
P - periodic downloaded static route
Gateway of last resort is not set
102.0.0.0/16 is subnetted, 1 subnets
C 102.102.0.0 is directly connected, Loopback0
103.0.0.0/32 is subnetted, 1 subnets
O 103.103.0.1 [110/2] via 129.129.0.2, 23:14:31, ATM1/0.1
100.0.0.0/32 is subnetted, 1 subnets
O 100.100.0.1 [110/11] via 123.123.0.2, 23:45:47, Ethernet0/1
101.0.0.0/32 is subnetted, 1 subnets
O IA 101.101.0.1 [110/13] via 129.129.0.2, 23:13:01, ATM1/0.1
O 128.128.0.0/16 [110/2] via 129.129.0.2, 23:14:31, ATM1/0.1
C 129.129.0.0/16 is directly connected, ATM1/0.1
125.0.0.0/16 is subnetted, 1 subnets
O IA 125.125.0.0 [110/12] via 129.129.0.2, 23:13:08, ATM1/0.1
123.0.0.0/16 is subnetted, 1 subnets
C 123.123.0.0 is directly connected, Ethernet0/1
104.0.0.0/32 is subnetted, 1 subnets
O 104.104.0.1 [110/3] via 129.129.0.2, 23:14:32, ATM1/0.1
Check the prefix to label/VC mapping with the show tag-switching forwarding-table command.
Guilder#show tag-switching forwarding-table Local Outgoing Prefix Bytes tag Outgoing Next Hop tag tag or VC or Tunnel Id switched interface 26 Untagged 100.100.0.1/32 570 Et0/1 123.123.0.2 27 2/33 103.103.0.1/32 0 AT1/0.1 point2point 28 2/34 128.128.0.0/16 0 AT1/0.1 point2point 29 2/35 104.104.0.1/32 0 AT1/0.1 point2point 30 2/37 125.125.0.0/16 0 AT1/0.1 point2point 31 2/38 101.101.0.1/32 0 AT1/0.1 point2point
On Capri (the ATM LSR), you can check the TVC to route binding with the show tag atm-tdp bindings command. One TVC is used for each routing table entry.
Capri#show tag atm-tdp bindings
Destination: 103.103.0.0/16
Tailend Switch ATM3/0/0 2/34 Active -> Terminating Active
Tailend Switch ATM3/0/3 2/34 Active -> Terminating Active
Destination: 129.129.0.0/16
Tailend Switch ATM3/0/0 2/35 Active -> Terminating Active
Destination: 101.101.0.1/32
Transit ATM3/0/3 2/33 Active -> ATM3/0/0 2/36 Active
Destination: 104.104.0.1/32
Transit ATM3/0/3 2/35 Active -> ATM3/0/0 2/37 Active
Destination: 125.125.0.0/16
Transit ATM3/0/3 2/36 Active -> ATM3/0/0 2/38 Active
Destination: 128.128.0.0/16
Tailend Switch ATM3/0/3 2/37 Active -> Terminating Active
Destination: 102.102.0.1/32
Transit ATM3/0/0 2/53 Active -> ATM3/0/3 2/33 Active
Destination: 100.100.0.1/32
Transit ATM3/0/0 2/54 Active -> ATM3/0/3 2/34 Active
Destination: 123.123.0.0/16
Transit ATM3/0/0 2/55 Active -> ATM3/0/3 2/35 Active
Troubleshoot
There is currently no specific troubleshooting information available for this configuration.
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Refer to Cisco Technical Tips Conventions for information on conventions used in this document.