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ATM Switch Router Software Configuration Guide
OL-7396-01
Chapter 16
Configuring Tag Switching and MPLS
Configuring Label Edge Routing
MPLS Processing
To configure LER with the enhanced ATM router module acting as MPLS edge proxy, perform the
following steps:
Note
You must enable MPLS on the ATM interface by using the
mpls ip
command.
Note
Once MPLS is enabled on an ATM interface and the interface is linked to the enhanced ATM router
module, all head-end, control, and tail-end VCs through that ATM interface terminate on the Enhanced
ATM router module. All MPLS or IP packet processing is performed on the linked Enhanced ATM router
module.
Note
If you attempt to link an already linked ATM interface to another enhanced ATM router module
interface, an error message similar to the following results:
ATM <x/x/x> is already
functioning as mpls edge for ATM <y/y/y>.
Note
If you attempt to unlink an ATM interface that is not linked, an error message similar to the following
results:
ATM <x/x/x> is not linked to ATM <y/y/y>.
Example
The following example shows how to link an ATM interface to an enhanced ATM router module
interface for LER MPLS functionality:
Switch#
configure terminal
8540-ATM-PE1(conf)#
interface atm 3/0/0
8540-ATM-PE1(conf-if)#
mpls ip
8540-ATM-PE1(conf-if)#
mpls-forwarding interface atm 10/0/1
Command
Purpose
Step 1
Switch(config)#
interface atm
card
/
subcard
/
port
Switch(config-if)#
Selects the interface to be configured.
Step 2
Switch(config-if)#
mpls ip
Enables MPLS on the ATM interface.
Step 3
Switch(config-if)#
mpls-forwarding interface
atm
card
/
subcard
/
port
Links the specified ATM interface to the
enhanced ATM router module interface, which
acts as an MPLS edge proxy.