3Com 3C13636 Configuration Manual page 683

3Com Router 3000 Ethernet Family
Configuration Guide
function is implemented by the route reflector, and all its client peers and non-client
peers are regular BGP peers that have no relation to the reflection function. The client
peers are clients just because the route reflector regards them as clients.
I. Configuring route reflection between clients
Perform the following configuration in BGP view.
Table 6-31 Configure route reflection between clients
Enable route reflection between clients
Disable route reflection between clients
By default, route reflection between clients is enabled.
II. Configuring the route reflector
Generally speaking, there is a route reflector in a cluster, whose ID identifies the
cluster.
Perform the following configuration in BGP view.
Table 6-32 Configure the cluster ID of the route reflector
Configure the cluster ID of the route
reflector
Cancel the cluster ID of the route
reflector
III. Two measures to avoid loops inside an AS
With the introduction of the route reflector, routing loops might occur in the AS. An
update message originated from the cluster may attempt to return to the cluster. The
conventional AS path method cannot detect an internal loop in the AS because the
update message has not left the AS. With a route reflector configured, you can use the
following measures to avoid internal loops in the AS:
1) Configuring the Originator_ID of the route reflector
If the Originator_ID is wrongly configured, the update message will be returned to the
originator, and the originator will discard it.
This parameter needs no manual configuration, and it is enabled automatically with
BGP.
2) Configuring the Cluster_ID of the route reflector
Operation
Operation
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6-18
Chapter 6 BGP Configuration
Command
reflect between-clients
undo reflect between-clients
Command
reflector cluster-id
address }
undo reflector cluster-id
{ cluster-id |