Configuring A Bgp Route Reflector; Configuring A Bgp Confederation - HP MSR2000 series Configuration Manual

Step
3. Advertise the COMMUNITY
attribute to a peer or peer group.
4. Apply a routing policy to routes
advertised to a peer or peer
group.

Configuring a BGP route reflector

If an AS has many BGP routers, you can configure them as a cluster by configuring one of them as a route
reflector and others as clients to reduce IBGP connections.
To enhance network reliability and prevent single point of failure, specify multiple route reflectors for a
cluster. The route reflectors in the cluster must have the same cluster ID to avoid routing loops.
It is not required to make clients of a route reflector fully meshed. The route reflector forwards routing
information between clients. If clients are fully meshed, disable route reflection between clients to reduce
routing costs.
Generally, a cluster has only one route reflector, and the router ID is used to identify the cluster. You can
configure multiple route reflectors to improve network stability. To avoid routing loops, specify the same
cluster ID for these route reflectors by using the reflector cluster-id command.
To configure a BGP route reflector:
Step
1. Enter system view.
2. Enter BGP view.
3. Configure the router as a route
reflector and specify a peer or
peer group as its client.
4. Enable route reflection
between clients.
5. Configure the cluster ID of the
route reflector.

Configuring a BGP confederation

Configuring a BGP confederation is another way for reducing IBGP connections in an AS.
A confederation contains sub ASs. In each sub AS, IBGP peers are fully meshed. Between sub ASs, EBGP
connections are established.
Command
•
Advertise the COMMUNITY attribute to a
peer or peer group:
peer { group-name | ip-address }
advertise-community
•
Advertise the extended community attribute
to a peer or peer group:
peer { group-name | ip-address }
advertise-ext-community
peer { group-name | ip-address } route-policy
route-policy-name export
Command
system-view
bgp as-number
peer { group-name | ip-address }
reflect-client
reflect between-clients
reflector cluster-id cluster-id
222
Remarks
Not configured by
default.
Not configured by
default.
Remarks
N/A
N/A
Not configured by default.
Optional.
Enabled by default.
Optional.
By default, a route reflector uses its
router ID as the cluster ID.