Confederation Id - H3C S7500E Series Command Manual

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Command Manual – IPv4 Routing

H3C S7500E Series Ethernet Switches

# 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

confederation id as-number

undo confederation id

as-number: Number of the AS that contains multiple sub-ASs, in the range 1 to 65535.

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.

# 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

Chapter 5 BGP Configuration Commands

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