Cisco CRS Configuration Manual page 257

Implementing MPLS Layer 3 VPNs
Example:
RP/0/RP0/CPU0:router(config)# router bgp 10
Specifies the BGP AS number and enters the BGP configuration mode, allowing you to configure the BGP routing
process.
Step 3 vrf vrf-name
Example:
RP/0/RP0/CPU0:router(config-bgp)# vrf vrf-pe
Configures a VRF instance.
Step 4 bgp router-id ip-address
Example:
RP/0/RP0/CPU0:router(config-bgp-vrf)#bgp router-id 172.16.9.9
Configures a fixed router ID for a BGP-speaking router.
Step 5
label-allocation-mode { per-ce | per-vrf }
Example:
RP/0/RP0/CPU0:router(config-bgp-vrf)# label-allocation-mode per-ce
Configures the per-CE label allocation mode to avoid an extra lookup on the PE router and conserve label space (per-prefix
is the default label allocation mode). In this mode, the PE router allocates one label for every immediate next-hop (in
most cases, this would be a CE router). This label is directly mapped to the next hop, so there is no VRF route lookup
performed during data forwarding. However, the number of labels allocated would be one for each CE rather than one
for each VRF. Because BGP knows all the next hops, it assigns a label for each next hop (not for each PE-CE interface).
When the outgoing interface is a multiaccess interface and the media access control (MAC) address of the neighbor is
not known, Address Resolution Protocol (ARP) is triggered during packet forwarding.
The per-vrf keyword configures the same label to be used for all the routes advertised from a unique VRF.
Step 6 address-family ipv6 unicast
Example:
RP/0/RP0/CPU0:router(config-bgp-vrf)# address-family ipv6 unicast
Specifies an IPv6 address family unicast and enters address family configuration submode.
To see a list of all the possible keywords and arguments for this command, use the CLI help (?).
Step 7
redistribute {connected | static | eigrp }
Example:
RP/0/RP0/CPU0:router(config-bgp-vrf-af)#
Causes routes from the specified instance to be redistributed into BGP.
Cisco IOS XR Virtual Private Network Configuration Guide for the Cisco CRS Router, Release 6.1.x
Configuring Carrier Supporting Carrier
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