Cisco CRS Configuration Manual page 249

Implementing MPLS Layer 3 VPNs
This configuration adds the implicit NULL rewrite corresponding to the peer associated with the interface,
Note
which is required to prevent BGP from automatically installing rewrites by LDP (in multihop instances).
SUMMARY STEPS
1. configure
2. router bgp as-number
3. mpls activate
4. interface type interface-path-id
5. Use the commit or end command.
DETAILED STEPS
Step 1 configure
Example:
RP/0/RP0/CPU0:router# configure
Enters Global Configuration mode.
Step 2
router bgp as-number
Example:
RP/0/RP0/CPU0:router(config)# router bgp 120
RP/0/RP0/CPU0:router(config-bgp)
Enters BGP configuration mode allowing you to configure the BGP routing process.
Step 3 mpls activate
Example:
RP/0/RP0/CPU0:router(config-bgp)# mpls activate
RP/0/RP0/CPU0:router(config-bgp-mpls)#
Enters BGP MPLS activate configuration mode.
Step 4 interface type interface-path-id
Example:
RP/0/RP0/CPU0:router(config-bgp-mpls)# interface GigabitEthernet 0/3/0/0
Enables MPLS on the interface.
Step 5 Use the commit or end command.
commit - Saves the configuration changes and remains within the configuration session.
end - Prompts user to take one of these actions:
Providing VPN Connectivity Across Multiple Autonomous Systems with MPLS VPN Inter-AS with ASBRs Exchanging
Cisco IOS XR Virtual Private Network Configuration Guide for the Cisco CRS Router, Release 6.1.x
VPN-IPv4 Addresses
235