Switch 7700 Command reference Guide, v2.0

BGP Configuration Commands 191
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 parameter.
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 commands: 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.
[SW7700]bgp 41
[SW7700-bgp]confederation id 9
[SW7700-bgp]confederation peer-as 38 39 40
[SW7700-bgp]peer 10.1.1.1 as-number 38
[SW7700-bgp]peer 200.1.1.1 as-number 98
confederation
nonstandard
Syntax
confederation nonstandard
undo confederation nonstandard
View
BGP view.
Parameter
none
Description
■ Use the confederation nonstandard command to configure the router to be
compatible with routers not following RFC1965.
■ Use the undo confederation nonstandard command to disable this function.
By default, it is in accordance with RFC1965.
Related commands: confederation id, confederation peer-as.