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Implementing BGP on Cisco IOS XR Software
Information About Implementing BGP on Cisco IOS XR Software
RC-9
Cisco IOS XR Routing Configuration Guide
OL-14356-01
VRF Neighbor Address Family Configuration Mode
The following example shows how to enter VRF neighbor address family configuration mode:
RP/0/RP0/CPU0:router(config)# router bgp 112
RP/0/RP0/CPU0:router(config-bgp)# vrf vrf_A
RP/0/RP0/CPU0:router(config-bgp-vrf)# neighbor 11.0.1.2
RP/0/RP0/CPU0:router(config-bgp-vrf-nbr)# address-family ipv4 unicast
RP/0/RP0/CPU0:router(config-bgp-vrf-nbr-af)#
VPNv4 Address Family Configuration Mode
The following example shows how to enter VPNv4 address family configuration mode:
RP/0/RP0/CPU0:router(config)# router bgp 152
RP/0/RP0/CPU0:router(config-bgp)# address-family vpnv4 unicast
RP/0/RP0/CPU0:router(config-bgp-af)#
VPNv6 Address Family Configuration Mode
The following example shows how to enter VPNv6 address family configuration mode:
RP/0/RP0/CPU0:router(config)# router bgp 150
RP/0/RP0/CPU0:router(config-bgp)# address-family vpnv6 unicast
RP/0/RP0/CPU0:router(config-bgp-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 multicast
• An address family configuration submode inside the neighbor configuration submode is available
for entering address family-specific neighbor configurations. In Cisco IOS XR, 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
• You must enter neighbor-specific IPv4, IPv6, VPNv4, or VPNv6 commands in neighbor
address-family configuration submode. In Cisco IOS XR software, the configuration is as follows:
RP/0/RP0/CPU0:router(config)# router bgp 109
RP/0/RP0/CPU0:router(config-bgp)# neighbor 192.168.40.24
RP/0/RP0/CPU0:router(config-bgp-nbr)# remote-as 1
RP/0/RP0/CPU0:router(config-bgp-nbr)# address-family ipv4 unicast
RP/0/RP0/CPU0:router(config-bgp-nbr-af)# maximum-prefix 1000
• You must enter neighbor-specific IPv4 and IPv6 commands in VRF neighbor address-family
configuration submode. In Cisco IOS XR software, the configuration is as follows:
RP/0/RP0/CPU0:router(config)# router bgp 110