Bgp Confederation Peers - D-Link DXS-3600 Series Cli Reference Manual

DXS-3600 Series Layer 3 Managed 10Gigabit Ethernet Switch CLI Reference Guide
Use the bgp confederation identifier command the specify the confederation ID, and use the bgp
confederation peer command to configure the neighbor session for connection to another sub-AS within
the same confederation.
Example
This example shows how to create a confederation in which the AS number is 20.
Switch# configure terminal
Switch(config)# router bgp 20
Switch(config-router)# bgp confederation identifier 20
11-14

bgp confederation peers

This command is used to add a BGP confederation peer. Use the no form of this command to delete a
confederation identifier.
bgp confederation peers AS-LIST
no bgp confederation peers AS-LIST
Parameters
AS-LIST
Default
By default, no confederation peer is configured.
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 and is connected to another 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.
Use the bgp confederation identifier command to specify the confederation ID and use the bgp
confederation peer command to configure the neighbor session for connection to another sub-AS within
the same confederation.
Example
This example shows how to configure the AS 21, 22, 23 as sub-ASs of a single confederation with
confederation identifier 20.
Switch# configure terminal
Switch(config)# router bgp 20
Switch(config-router)# bgp confederation identifier 20
Specifies one or multiple AS numbers for BGP peers separated by a
comma. The specified AS is in the same confederation. The valid
values are from 1 to 4294967295.
159