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Dell PowerEdge FN I/O Module Configuration Guide 9.10(0.0)

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Configuring BGP Confederations

Another way to organize routers within an AS and reduce the mesh for IBGP peers is to configure BGP confederations.

As with route reflectors, BGP confederations are recommended only for IBGP peering involving many IBGP peering sessions per router. Basically, when you configure BGP confederations, you break the AS into smaller sub-AS, and to those outside your network, the confederations appear as one AS. Within the confederation sub-AS, the IBGP neighbors are fully meshed and the MED, NEXT_HOP, and LOCAL_PREF attributes are maintained between confederations.

To configure BGP confederations, use the following commands.

  • Specifies the confederation ID. CONFIG-ROUTER-BGP mode bgp confederation identifier as-number

    • as-number : from 0 to 65535 (2 Byte) or from 1 to 4294967295 (4 Byte).

  • Specifies which confederation sub-AS are peers. CONFIG-ROUTER-BGP mode bgp confederation peers as-number [... as-number]

    • as-number : from 0 to 65535 (2 Byte) or from 1 to 4294967295 (4 Byte).

    All Confederation routers must be either 4 Byte or 2 Byte. You cannot have a mix of router ASN support.
To view the configuration, use the show config command in CONFIGURATION ROUTER BGP mode.

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