Cisco NCS 6000 Series

RP/0/RP0/CPU0:router(config)# router bgp 112
RP/0/RP0/CPU0:router(config-bgp)# address-family ipv4 unicast
RP/0/RP0/CPU0:router(config-bgp-af)#
Neighbor Configuration Mode
The following example shows how to enter neighbor configuration mode:
RP/0/RP0/CPU0:router(config)# router bgp 140
RP/0/RP0/CPU0:router(config-bgp)# neighbor 10.0.0.1
RP/0/RP0/CPU0:router(config-bgp-nbr)#
Neighbor Address Family Configuration Mode
The following example shows how to enter neighbor address family configuration mode:
RP/0/RP0/CPU0:router(config)# router bgp 112
RP/0/RP0/CPU0:router(config-bgp)# neighbor 10.0.0.1
RP/0/RP0/CPU0:router(config-bgp-nbr)# address-family ipv4 unicast
RP/0/RP0/CPU0:router(config-bgp-nbr-af)#
Neighbor Submode
Cisco IOS XR BGP uses a neighbor submode to make it possible to enter configurations without having to
prefix every configuration with the neighbor keyword and the neighbor address:
• Cisco IOS XR software has a submode available for neighbors in which it is not necessary for every
command to have a “neighbor x.x.x.x” prefix:
In Cisco IOS XR software, the configuration is as follows:
RP/0/RP0/CPU0:router(config-bgp)# neighbor 192.23.1.2
RP/0/RP0/CPU0:router(config-bgp-nbr)# remote-as 2002
RP/0/RP0/CPU0:router(config-bgp-nbr)# address-family ipv4 unicast
• An address family configuration submode inside the neighbor configuration submode is available for
entering address family-specific neighbor configurations. In Cisco IOS XR software, the configuration
is as follows:
RP/0/RP0/CPU0:router(config-bgp)# neighbor 2002::2
RP/0/RP0/CPU0:router(config-bgp-nbr)# remote-as 2023
RP/0/RP0/CPU0:router(config-bgp-nbr)# address-family ipv6 unicast
RP/0/RP0/CPU0:router(config-bgp-nbr-af)# next-hop-self
RP/0/RP0/CPU0:router(config-bgp-nbr-af)# route-policy one in
Configuration Templates
The af-group, session-group, and neighbor-group configuration commands provide template support for
the neighbor configuration in Cisco IOS XR software.
The af-group command is used to group address family-specific neighbor commands within an IPv4, IPv6,
address family. Neighbors that have the same address family configuration are able to use the address family
group (af-group) name for their address family-specific configuration. A neighbor inherits the configuration
Routing Configuration Guide for Cisco NCS 6000 Series Routers, IOS XR Release 6.4.x
9
Implementing BGP
Neighbor Configuration Mode