Confederation Id - 3Com S7906E Command Reference Manual

Examples
# In BGP view, enable the comparison of the MED for paths from peers in different ASs.
<Sysname> system-view
[Sysname] bgp 100
[Sysname-bgp] compare-different-as-med
# In BGP-VPN instance view, enable the comparison of the MED for paths from peers in different ASs
(The VPN has been created).
<Sysname> system-view
[Sysname] bgp 100
[Sysname-bgp] ipv4-family vpn-instance vpn1
[Sysname-bgp-vpn1] compare-different-as-med

confederation id

Syntax
confederation id as-number
undo confederation id
View
BGP view
Default Level
2: System level
Parameters
as-number: Number of the AS that contains multiple sub-ASs, in the range 1 to 65535.
Description
Use the confederation id command to configure a confederation ID.
Use the undo confederation id command to remove a specified confederation.
By default, no confederation ID is configured.
Configuring a confederation can reduce IBGP connections in a large AS. You can split the AS into
several sub-ASs, and each sub-AS remains fully meshed. These sub-ASs form a confederation. Key
IGP attributes of a route, such as the next hop, MED, local preference, are not discarded when crossing
each sub-AS. The sub-ASs still look like a whole from the perspective of other ASs. This can ensure the
integrity of the former AS, and solve the problem of too many IBGP connections in the AS.
Related commands: confederation nonstandard and confederation peer-as.
Examples
# Confederation 9 consists of four sub-ASs, namely, 38, 39, 40 and 41. The peer 10.1.1.1 is a member
of the confederation while the peer 200.1.1.1 is outside of the confederation. Take sub AS 41 as an
example.
<Sysname> system-view
[Sysname] bgp 41
[Sysname-bgp] confederation id 9
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