Cisco NCS 5500 Series

Example:
RP/0/RP0/CPU0:router(config-vrf-af)# import route-target 234:222
Specifies a list of route target (RT) extended communities. Only prefixes that are associated with the specified import
route target extended communities are imported into the VRF.
Step 7
export route-policy policy-name
Example:
RP/0/RP0/CPU0:router(config-vrf-af)# export route-policy policy_b
(Optional) Provides finer control over what gets exported into a VRF. This export filter discards prefixes that do not
match the specified policy-name argument.
Step 8
export route-target [ as-number : nn | ip-address : nn ]
Example:
RP/0/RP0/CPU0:routerr(config-vrf-af)# export route-target 123;234
Specifies a list of route target extended communities. Export route target communities are associated with prefixes when
they are advertised to remote PEs. The remote PEs import them into VRFs which have import RTs that match these
exported route target communities.
Step 9
commit
Configure Route Distinguisher
The route distinguisher (RD) makes prefixes unique across multiple VPN routing and forwarding (VRF)
instances.
In the L3VPN multipath same route distinguisher (RD)environment, the determination of whether to install
a prefix in RIB or not is based on the prefix's bestpath. In a rare misconfiguration situation, where the best
pah is not a valid path to be installed in RIB, BGP drops the prefix and does not consider the other paths. The
behavior is different for different RD setup, where the non-best multipath will be installed if the best multipath
is invalid to be installed in RIB.
Perform this task to configure the RD.
BGP Configuration Guide for Cisco NCS 5500 Series Routers, IOS XR Release 6.2.x
104
Implementing BGP
Configuring a VPN Routing and Forwarding Instance in BGP