Cisco Cisco IOS Software Release 12.2(14)S
BGP Next Hop Propagation
How to Configure BGP Next Hop Propagation
6
Cisco IOS Release 12.0(16)ST, 12.2, 12.2(14)S, and 12.0(22)S
4.
address-family ipv4 [mdt | multicast | tunnel | unicast [vrf vrf-name] | vrf vrf-name]
5.
neighbor ip-address activate
6.
neighbor ip-address ebgp-multihop ttl
7.
neighbor ip-address next-hop-unchanged
8.
end
DETAILED STEPS
Command or Action
Purpose
Step 1
enable
Example:
Router> enable
Enables privileged EXEC mode.
•
Enter your password if prompted.
Step 2
configure
terminal
Example:
Router# configure terminal
Enters global configuration mode.
Step 3
router bgp as-number
Example:
Router(config)# router bgp 65412
Enters router configuration mode, and creates a BGP
routing process.
routing process.
Step 4
address-family ipv4 [mdt | multicast | tunnel |
unicast [vrf vrf-name] | vrf vrf-name]
Example:
Router(config-router-af)# address-family ipv4
Enter address family configuration mode to configure BGP
peers to accept address family specific configurations.
peers to accept address family specific configurations.
Step 5
neighbor ip-address activate
Example:
Router(config-router-af)# neighbor 192.168.0.1
activate
Enables the exchange of information with the address
family peer.
family peer.
Step 6
neighbor ip-address ebgp-multihop ttl
Example:
Router(config-router-af)# neighbor 192.168.0.1
ebgp-multihop 255
Configures the local router to accept and initiate
connections to external peers that reside on networks that
are not directly connected.
connections to external peers that reside on networks that
are not directly connected.
Step 7
neighbor ip-address next-hop-unchanged
Example:
Router(config-router-af)# neighbor 192.168.0.1
activate
Configures the router to send BGP updates to BGP peers
without modifying the next hop attribute.
without modifying the next hop attribute.
Step 8
end
Example:
Router(config-router-af)# end
Exits address family configuration mode, and enters
privileged EXEC mode.
privileged EXEC mode.