Chapter 29
| IP Routing Commands
Border Gateway Protocol (BGPv4)
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neighbor route-
server-client
This command configures this router as a route server and the specified neighbor
as its client. Use the no form to disable the route server for the specified neighbor.
Syntax
[no] neighbor {ip-address | group-name} route-server-client
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
None
Command Usage
â—† A route server is used as a replacement for full mesh eBGP routing in internet
exchange points in a manner similar to the way route reflectors are used in
iBGP. Instead of maintaining direct eBGP peering sessions with every other
service provider, providers can acquire the same routing information through a
single connection to a route server at the Internet exchange.
â—† Using a route server reduces the configuration complexity required for an eBGP
full mesh, limits CPU and memory requirements for the exchange of peering
messages, and avoids the need for negotiating a large number of individual
peering agreements.
Example
In the following example, the router 10.1.1.64 (AS100) is configured as the route
server for neighbors 10.1.1.66 (AS200) and 10.1.1.68 (AS300).
Console(config)#router bgp 100
Console(config-router)#neighbor 10.1.1.66 remote-as 200
Console(config-router)#neighbor 10.1.1.66 route-server-client
Console(config-router)#neighbor 10.1.1.68 remote-as 300
Console(config-router)#neighbor 10.1.1.68 route-server-client
Console(config-router)#
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