Bgp Confederation Identifier - D-Link DXS-3600 Series Reference Manual

DXS-3600 Series Layer 3 Managed 10Gigabit Ethernet Switch CLI Reference Guide
In a large scale BGP network, route reflection is a mechanism used to reduce the needs of fully mesh of
iBGP sessions. With route reflection, an autonomous system can be partitioned into a number of clusters;
each cluster is formed by the route reflector and its client. The connection between clusters is still fully
meshed. However, in a cluster, the reflector needs to maintain connections with all clients, but the client
does not need to maintain connections with other clients. The route reflector is responsible to reflect
routes received from one client to other clients.
Each cluster is distinguished by a cluster ID. The cluster ID configured on the route reflector is the ID of
the cluster. When cluster ID is not configured on the route reflector, the router ID of the reflector will be
the cluster ID.
In a cluster, the user can define multiple route reflectors to provide redundancy and avoid the single point
of failure, but these route reflectors must be configured with the same cluster ID. Use the bgp cluster-id
command on the route reflector to configure the cluster ID on these route reflectors.
Example
This example shows how to configure the cluster has multiple route reflectors, and the local router as one
of the route reflectors. It is configured with cluster ID 10.1.10.1.
Switch# configure terminal
Switch(config)# router bgp 100
Switch(config-router)# bgp cluster-id 10.1.10.1
10-13

bgp confederation identifier

This command is used to specify a BGP confederation identifier. Use the no form of this command to
remove the confederation identifier.
bgp confederation identifier AS-NUMBER
no bgp confederation identifier
Parameters
AS-NUMBER
Default
None.
Command Mode
Router Configuration Mode.
Command Default Level
Level: 12.
Usage Guideline
In a large scale BGP network, confederation is a mechanism used to reduce the needs of fully mesh of
iBGP sessions. With confederation, an autonomous system can be partitioned into a number of a sub-AS.
To the routers outside, the group of sub-AS appear as a single AS identified by the confederation ID.
Each sub-AS is fully meshed within the sub-AS itself and is connected to other sub-AS within the
confederation. Route reflection can be used within the sub-AS to reduce the fully mesh. ,
Although peers in different sub-AS are connected by eBGP sessions, they exchange routing information
as if they were iBGP peers. The next-hop, MED, and local preference information is preserved within the
confederation.
Specifies an Autonomous System number as a BGP confederation ID.
The value is from 1 to 4294967295.
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