Configure Bgp Permanent Network - Cisco NCS 5500 Series Configuration Manual

BGP Permanent Network
for a set of prefixes. For each network in the prefix-set, a BGP permanent path is created and treated as less
preferred than the other BGP paths received from its peer. The BGP permanent path is downloaded into RIB
when it is the best-path.
The permanent-network command in global address family configuration mode uses a route-policy to identify
the set of prefixes (networks) for which permanent paths is to be configured. The advertise permanent-network
command in neighbor address-family configuration mode is used to identify the peers to whom the permanent
paths must be advertised. The permanent paths is always advertised to peers having the advertise
permanent-network configuration, even if a different best-path is available. The permanent path is not advertised
to peers that are not configured to receive permanent path.
The permanent network feature supports only prefixes in IPv4 unicast and IPv6 unicast address-families under
the default Virtual Routing and Forwarding (VRF).
Restrictions
These restrictions apply while configuring the permanent network:
• Permanent network prefixes must be specified by the route-policy on the global address family.
• You must configure the permanent network with route-policy in global address family configuration
• When removing the permanent network configuration, remove the configuration in the neighbor address

Configure BGP Permanent Network

Perform this task to configure BGP permanent network. You must configure at least one route-policy to
identify the set of prefixes (networks) for which the permanent network (path) is to be configured.
SUMMARY STEPS
1. configure
2. prefix-set prefix-set-name
3. exit
4. route-policy route-policy-name
5. end-policy
6. router bgp as-number
7. address-family { ipv4 | ipv6 } unicast
8. permanent-network route-policy route-policy-name
9. commit
10. show bgp {ipv4 | ipv6} unicast prefix-set
DETAILED STEPS
Step 1
configure
Step 2
prefix-set prefix-set-name
BGP Configuration Guide for Cisco NCS 5500 Series Routers, IOS XR Release 6.2.x
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mode and then configure it on the neighbor address family configuration mode.
family configuration mode and then remove it from the global address family configuration mode.
Implementing BGP