Command Reference Guide

3Com Router 3000 Ethernet Family
Command Reference Guide
Chapter 5 BGP Configuration Commands
3Com Corporation
5-5
undo confederation id
View
BGP view
Parameter
as-number: Number of the AS which contains multiple sub-ASs. The range is from 1 to
65535.
Description
Use the confederation id command to configure confederation identifier.
Use the undo confederation id command to cancel the configured confederation ID.
By default, the confederation ID is not configured.
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 command: confederation nonstandard and confederation peer-as.
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
5.1.6 confederation nonstandard
Syntax
confederation nonstandard
undo confederation nonstandard