Chapter 50
| IP Routing Commands
Border Gateway Protocol (BGPv4)
– 1124 –
neighbor
next-hop-self
This command configures the local router as the next hop for a neighbor in all
routing messages it sends. Use the no form to disable this feature.
Syntax
[no] neighbor {ip-address | group-name} next-hop-self
ip-address – IP address of a neighbor.
group-name – A BGP peer group containing a list of neighboring routers
configured with the neighbor peer-group command.
Command Mode
Router Configuration
Default Setting
Disabled
Command Usage
â—† iBGP routers only connected to other iBGP routers in same segment will not be
able to talk with iBGP routers outside of the segment if they are not directly
connected with each other. This command can be used in these kinds of
networks (i.e., un-meshed or non-broadcast) where iBGP neighbors may not
have direct access to all other neighbors on the same IP subnet.
â—† Even when a successful BGP relationship seems to have been established
within the local AS, you may not able to see some routes in the routing table.
iBGP routers only connected with other iBGP routers in same AS will not be able
to talk with routers outside of the AS if they are not directly connected with
each other. The neighbor next-hop-self command can be used to configure
an iBGP router which is directly connected with an eBGP neighbor so that other
iBGP routers in the same AS can talk with eBGP routers outside the AS.
Example
Console(config-router)#neighbor 10.1.1.64 next-hop-self
Console(config-router)#
neighbor
override-capability
This command overrides the result of capability negotiations, allowing a session to
be formed with a peer that does not support capability negotiation. Use the no
form to disable this feature.
Syntax
[no] neighbor {ip-address | group-name} neighbor override-capability
ip-address – IP address of a neighbor.
group-name – A BGP peer group containing a list of neighboring routers
configured with the neighbor peer-group command.
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