Command Reference Guide

30 ● confederation id 3Com Router 5000 Family and Router 6000 Family
Command Reference
confederation id
Purpose Use the confederation id command to configure confederation identifier.
Use the undo confederation id command to cancel the configured
confederation ID.
Syntax confederation id as-number
undo confederation id
Parameters as-number
Number of the AS which contains multiple sub-ASs.
The range is from 1 to 65535.
Default By default, the confederation ID is not configured.
Example Confederation 9 consists of four sub-ASs, namely, 38, 39, 40 and 41. Here, the peer
10.1.1.1 is an internal member of the AS confederation while the peer 200.1.1.1 is
an external member of the AS confederation. For external members, Confederation 9
is a unified AS domain.
[3Com ] bgp 41
[3Com -bgp] confederation id 9
[3Com -bgp] confederation peer-as 38 39 40
[3Com -bgp] peer 10.1.1.1 as-number 38
[3Com -bgp] peer 200.1.1.1 as-number 98
View This command can be used in the following views:
■ BGP view
Description Confederation can be adopted to solve the problem of too many IBGP full
connections in a large AS domain. The solution is, first dividing the AS domain into
several smaller sub-ASs, and each sub-ASs remains full-connected. These sub-ASs
form a confederation. Key IGP attributes of the route, such as next hop, MED, local
preference, are not discarded across each sub-ASs. The sub-ASs still look like a whole
from the point of view of a confederation although these sub-ASs have EBGP
relations. This can assure the integrality of the former AS domain, and ease the
problem of too many connections in the domain.
Related Commands ■ confederation nonstandard
■ confederation peer-as