Command Manual – Routing Protocol
Quidway S8500 Series Routing Switches Chapter 5 BGP Configuration Commands
Huawei Technologies Proprietary
5-5
Description
Use the confederation id command to configure confederation identifier.
Use the undo confederation id command to cancel the BGP confederation specified
by as-number argument.
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 BGP 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, 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.
[Quidway] bgp 41
[Quidway-bgp] confederation id 9
[Quidway-bgp] confederation peer-as 38 39 40
[Quidway-bgp] group Confed38 external
[Quidway-bgp] peer Confed38 as-number 38
[Quidway-bgp] peer 10.1.1.1 group Confed38
[Quidway-bgp] group Remote98 external
[Quidway-bgp] peer Remote98 as-number 98
[Quidway-bgp] peer 200.1.1.1 group Remote98
5.1.6 confederation nonstandard
Syntax
confederation nonstandard
undo confederation nonstandard
View
BGP view.
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