Configuring Bgp Community; Configuring A Bgp Route Reflector - HP 6125G Configuration Manual

NOTE:
Do not specify any AS number for a peer before adding it into the peer group.
•
Peers added in the group can have different AS numbers.
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Configuring BGP community

A BGP community is a group of destinations with the same characteristics. It has no geographical
boundaries and is independent of ASs.
You can configure a routing policy to define which destinations belong to a BGP community and then
advertise the COMMUNITY attribute to a peer or peer group.
You can apply a routing policy to filter routes advertised to or received from a peer or peer group
according to the COMMUNITY attribute, which helps simplify policy configuration and management.
For how to configure a routing policy, see "Configuring routing policies."
To configure BGP community:
Step
1. Enter system view.
2. Enter BGP view.
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:
Command
system-view
bgp as-number
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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
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Remarks
N/A
N/A
Not configured by
default.
Not configured by
default.