In this example, the router advertises a single label, 53, to the remote peer, 10.9.1.3,
and receives a single label, 55, from the peer, resulting in the following forwarding
table:
host1:# show mpls forwarding brief
Platform label space
In Label Owner Action
-------- -------- -------------------------------------------------------
53 ldp l2transport to FastEthernet3/0.1
l2transport to FastEthernet2/0.1
L2transport
Interface Owner Action
-------------------- -------- -------------------------------------------------
FastEthernet2/0.1 ldp swap to 55, push 42 on ATM5/0.1, nbr 10.10.11.5
FastEthernet3/0.1 ldp swap to 55, push 42 on ATM5/0.1, nbr 10.10.11.5
Traffic that arrives on either interface, 2/0.1 or 3/0.1, is forwarded to the remote
peer with the same label stack (55, 42). Traffic from the remote peer with label 53
is forwarded to one of the two shim interfaces; the ECMP algorithm determines which
of the two shim interfaces receives the traffic.
In the case of a local cross-connects configuration, the following commands illustrate
how a three-way cross-connect is created when 10.9.1.2 is a local address:
host1(config)#interface atm 6/0.101 point-to-point
host1(config-subif)#mpls-relay 10.9.1.2 600001
host1(config-subif)#exit
host1(config)#interface atm 6/2.101 point-to-point
host1(config-subif)#mpls-relay 10.9.1.2 600001
host1(config-subif)#exit
host1(config)#interface atm 6/2.103 point-to-point
host1(config-subif)#mpls-relay 10.9.1.2 600001
This configuration results in the following forwarding table:
host1:two# show mpls forwarding brief
Platform label space
…
L2transport
Interface Owner Action
-------------------- -------- -------------------------------------------------------------------
ATM6/0.101 ldp l2transport to ATM6/2.101
l2transport to ATM6/2.103
ATM6/2.101 ldp l2transport to ATM6/0.101
l2transport to ATM6/2.103
ATM6/2.103 ldp l2transport to ATM6/0.101
l2transport to ATM6/2.101
Traffic that arrives on interface 6/0.101 is forwarded by means of ECMP to both
interface 6/2.101 and interface 6/2.103. Traffic that arrives on interface 6/2.101 is
forwarded by means of ECMP to interface 6/0.101 and interface 6/2.103. Traffic that
arrives on interface 6/2.103 is forwarded by means of ECMP to interface 6/0.101
and 6/2.101.
Configuring CE-Side Load Balancing for Martini Layer 2 Transport â– 541
Chapter 7: Configuring Layer 2 Services over MPLS
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