H3C S5820X Series Command Reference Manual

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H3C S5820X Series Command Reference Manual Manual pdf 216 page image

6-7[Sysname] bgp 100[Sysname-bgp] ipv4-family vpn-instance vpn1[Sysname-bgp-vpn1] compare-different-as-medconfederation idSyntaxconfederation id as-numberundo confederation idViewBGP viewDefault Level2: System levelParametersas-number: Number of the AS that contains multiple sub-ASs, in the range 1 to 4294967295.DescriptionUse 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 intoseveral sub-ASs, and each sub-AS remains fully meshed. These sub-ASs form a confederation. KeyIGP attributes of a route, such as the next hop, MED, local preference, are not discarded whencrossing each sub-AS. The sub-ASs still look like a whole from the perspective of other ASs. This canensure 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 memberof the confederation while the peer 200.1.1.1 is outside of the confederation. Take sub AS 41 as anexample. 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[Sysname-bgp] peer 10.1.1.1 group Confed38[Sysname-bgp] group Remote98 external[Sysname-bgp] peer Remote98 as-number 98[Sysname-bgp] peer 200.1.1.1 group Remote98confederation nonstandardSyntaxconfederation nonstandard