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Creating a Confederation Configuring BGP
page 4-44 OmniSwitch 6800/6850/9000 Advanced Routing Configuration Guide December 2007
Creating a Confederation
A confederation is a grouping of ASs that together form a super AS. To BGP external peers, a confedera-
tion appears as another AS even though the confederation has multiple ASs within it. Within a confedera-
tion ASs can distinguish among one another and will advertise routes using EBGP.
1 Specify the confederation identifier for the local BGP router. This value is used to identify the confed-
eration affiliation of routes in advertisements. This value is essentially an AS number. To assign a confed-
eration number to the router use the ip bgp confederation identifier command. For example, to assign a
confederation value of 2, you would enter:
-> ip bgp confederation-identifier 2
2 Indicate whether a peer belongs to the confederation configured on this router using the
ip bgp confederation neighbor command. For example to assign the peer at 190.17.20.16 to confedera-
tion 2, you would enter:
-> ip bgp confederation neighbor 190.17.20.16
3 Repeat Step 2 for all peers that need to be assigned to the confederation.