Command Manual – IPv4 Routing
H3C S7500E Series Ethernet Switches Chapter 5 BGP Configuration Commands
5-7
Examples
# In BGP view, enable to compare the MED for paths from peers in different ASs.
<Sysname> system-view
[Sysname] bgp 100
[Sysname-bgp] compare-different-as-med
5.1.8 confederation id
Syntax
confederation id as-number
undo confederation id
View
BGP view
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
[Sysname-bgp] confederation peer-as 38 39 40
[Sysname-bgp] group Confed38 external
[Sysname-bgp] peer Confed38 as-number 38
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