ECS4660-28F_Management Guide-R03

C HAPTER 51 | 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
◆ 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.
◆ 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)#