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bgp confederation peers autonomous-system
[autonomous-system ...]
In the prompt Select 1 option ，prompt is as below:
(00)always-compare-med
......
(04)confederation
......
Please Input the code of command to be excute(0-8): 4
input 4，Select confederation option ，prompt is as below:
(00)identifier
(01)peers
Please Input the code of command to be excute(0-1): 1
input 0，Select peers option ，prompt is as below:
(00)<1-65535>
Please Input the code of command to be excute(0-0): 0
Select 0，then prompt is as below:
Please input a digital number:Please input a string:
input autonomous-system value
See the "BGP Automomous System Confederation Example" for examples of autonomous system
confederation.
6.12.19 Configure a Route Reflector
Instead of configuring a autonomous system confederation, another way to reduce the IBGP mesh is to
configure a route reflector.
The internal peers of the route reflector are divided into two groups: client peers and all the other
routers in the autonomous system (nonclient peers). A route reflector reflects routes between these two
groups. The route reflector and its client peers form a cluster. The nonclient peers must be fully meshed
with each other, but the client peers need not be fully meshed. The clients in the cluster do not
communicate with IBGP speakers outside their cluster.
When the route reflector receives an advertised route, it takes the following actions:
♦ A route from an external BGP speaker is advertised to all clients and nonclient peers.
♦ A route from a nonclient peer is advertised to all clients.
♦ A route from a client is advertised to all clients and nonclient peers. Hence, the clients need not be
fully meshed.
To configure a route reflector and its clients, perform the following task in router configuration mode:
neighbor ip-address route-reflector-client
In the prompt Select 12 option ，prompt is as below:
(00)A.B.C.D
Please Input the code of command to be excute(0-0): 0
input 0，Select A.B.C.D option ，then prompt：
Please input a IP Address:
input IP ，prompt is as below:
(00)default-originate
......
(10)route-reflector-client
......
Please Input the code of command to be excute(0-17): 10
Always compare MED
AS confederation
AS number of AS confederation
AS confederation members
AS number
Command
IP address of neighbor
Permit announcement of default route to neighbor
Configure the neighbor as route reflector client
Model Name
Specify the autonomous system that
belongs
to
confederation.
Configure the local router as a BGP route
reflector and the specified neighbor as a
client.
- 263 -
an
automomous
system
Purpose
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