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BGP and BGP4+ Configuration
Software Reference Supplement for SwitchBlade® x8112, x908, x900 and x610 Series Switches
2.8 AlliedWare Plus
TM
Operating System - Software Version 5.4.3-2.6 C613-50032-01 REV D
Configuring a BGP Confederation
In this example, AS1 contains three Confederation Autonomous Systems - AS 1000, AS
1001 and AS 1002. To any outside AS, the Confederation is a single AS. AS1 Confederation
eBGP is run between Peer 2 and Peer 5, and between Peer 5 and Peer 7. Peer 2 is
configured so that its local AS is 1000. Its peer connection to Peer 5 is set up like any other
eBGP session.
The bgp confederation identifier (BGP and BGP4+) command on page 3.21 tells the
peer that it is a member of a Confederation and the Confederation ID. The bgp
confederation peers (BGP and BGP4+) command on page 3.22 lists the member AS to
which Peer 2 is connected. The command tells the BGP process that the eBGP connection
is a Confederation eBGP rather than a normal eBGP.
bgp_5
Peer 4
Peer 7
10.10.11.5
Peer 6
10.10.10.5
Peer 5Peer 2
Peer 1
10.10.12.4
10.10.13.6
Peer 3
Peer 8
AS1
eBGP
eBGP
AS1001
AS1002
AS1000
10.10.7.3
10.10.9.1
10.10.10.2
10.10.11.7
10.10.15.8
Peer 2
awplus#
configure terminal
Enter the Global Configuration mode.
awplus(config)#
router bgp 1000
Define the BGP routing process. The number 1000 specifies
the AS number of Peer 2.
awplus(config-router)#
bgp confederation identifier 1
Specify a BGP Confederation Identifier. To routers outside
the confederation, the whole confederation will appear as a
single AS, and the identifier will appear as its AS number.
awplus(config-router)#
bgp confederation peers 1001 1002
Specify 1001 (AS1001) and 1002 (AS1002) to become
members of the Confederation.