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Implementing BGP on Cisco IOS XR Software
Information About Implementing BGP on Cisco IOS XR Software
RC-5
Cisco IOS XR Routing Configuration Guide
Router Configuration Mode
The following example shows how to enter router configuration mode:
RP/0/RP0/CPU0:router# configuration
RP/0/RP0/CPU0:router(config)# router bgp 140
RP/0/RP0/CPU0:router(config-bgp)#
Global Address Family Configuration Mode
The following example shows how to enter global address family configuration mode:
RP/0/RP0/CPU0:router(config)# router bgp 140
RP/0/RP0/CPU0:router(config-bgp)# address-family ipv4 multicast
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 140
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:
Router(config-bgp-af)# neighbor 192.23.1.2
Router(config-bgp-nbr)# remote-as 2002
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:
Router(config-bgp-af)# neighbor 2002::2
Router(config-bgp-nbr)# remote-as 2002
Router(config-bgp-nbr)# address-family ipv6 unicast
Router(config-bgp-nbr-af)# next-hop-self
Router(config-bgp-nbr-af)# route-policy one in
• You must enter neighbor-specific IPv4 or IPv6 commands in neighbor address-family configuration
submode. In Cisco IOS XR software, the configuration is as follows:
Router(config-bgp)# router bgp 109
Router(config-bgp)# neighbor 192.168.40.24