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ATM Switch Router Software Configuration Guide
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Chapter16 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
Step1 Switch(config)# interface atm card/subcard/port
Switch(config-if)#
Selects the interface to be configured.
Step2 Switch(config-if)# mpls ip Enables MPLS on the ATM interface.
Step3 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.