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Cisco 10000 Series Router Software Configuration Guide
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Chapter 20 Configuring L2 Virtual Private Networks
Any Transport over MPLS—Tunnel Selection
Default path: active
Next hop: point2point
Create time: 00:00:53, last status change time: 00:00:10
Signaling protocol: LDP, peer 2.2.2.2:0 up
MPLS VC labels: local 22, remote 98
Group ID: local 0, remote 0
MTU: local 1500, remote 1500
Remote interface description:
Sequencing: receive disabled, send disabled
VC statistics:
packet totals: receive 0, send 0
byte totals: receive 0, send 0
packet drops: receive 0, seq error 0, send 0
Any Transport over MPLS—Tunnel Selection
Tunnel Selection allows you to specify the path that Any Transport over MPLS (AToM) traffic uses.
You can specify either a MPLS traffic engineering tunnel or a destination IP address. If the specified path
is unreachable, you can specify that the virtual circuits (VCs) should use the default path, which is the
path that MPLS Label Distribution Protocol (LDP) uses for signaling.
Note By default, the preferred-path sub-command has a fallback pseudowire. If the preferred pseudowire
goes down, the MPLS/LDP module switch the circuit temporarily to another pseudowire. When the
preferred pseudowire is up again, the circuit is switched back to the preferred pseudowire. The
preferred-path subcommand also has an disable-fallback option, so that no random pseudowire is
chosen if the preferred path goes down. The circuit is down until the preferred path pseudowire comes
back up. However, in the 12.2(33) SB release, by default, the preferred-path sub-command has the
disable-fallback option. There is no fallback pseudowire in this release, even when the option is stated
explicitly.
See the Any Transport over MPLS: Tunnel Selection document for the following information:
• Prerequisites for Any Transport over MPLS: Tunnel Selection
• Restrictions for Any Transport over MPLS: Tunnel Selection
• Configuring Any Transport over MPLS: Tunnel Selection
• The debug mpls l2transport vc command for verifying Any Transport over MPLS: Tunnel
Selection
• Verifying the Configuration—Example
• Troubleshooting Any Transport over MPLS: Tunnel Selection—Example
Configuration Example—Any Transport over MPLS: Tunnel Selection
The following example sets up two preferred paths for PE1. One preferred path specifies an MPLS traffic
engineering tunnel. The other preferred path specifies an IP address of a loopback address on PE2. There
is a static route configured on PE1 that uses a TE tunnel to reach the IP address on PE2.
Router PE1
mpls label protocol ldp
mpls traffic-eng tunnels
mpls ldp router-id Loopback0