
Configuring IP Exterior Gateway Protocols (BGP and EGP)
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308628-15.0 Rev 00
Using the BCC
Figure 3-1
shows an example of a BGP-4 confederation. In this example, the
following steps establish sub-ASs 65000 and 65001 as confederation peers.
1.
Specify sub-AS 65002 as the local AS number and the external visible AS
number 20 as the BGP confederation identifier by entering:
/jointfilesconvert/97454/bgp#
local-as 65002
/jointfilesconvert/97454/bgp#
confederation-id 20
2.
Specify the local AS numbers of the other sub-ASs within the same
confederation as confederation peers by entering:
/jointfilesconvert/97454/bgp#
confederation-peers {65000 65001}
3.
Specify BGP peers within the confederation by entering:
/jointfilesconvert/97454/bgp#
peer 192.32.194.1/192.32.194.2 as 65000
(Router 3)
peer/192.32.194.1/192.32.194.2#
back
/jointfilesconvert/97454/bgp#
peer 192.32.194.5/192.32.194.6 as 65001
(Router 6)
peer/192.32.194.5/192.32.194.6#
back
/jointfilesconvert/97454/bgp#
peer 192.32.195.2/192.32.195.1 as 65002
(Router 8)
peer/192.32.195.2/192.32.195.1#
back
/jointfilesconvert/97454/bgp#
peer 192.32.195.5/192.32.195.6 as 65002
(Router 9)
peer/192.32.195.5/192.32.195.6#
back
/jointfilesconvert/97454/bgp#
4.
Specify BGP peers in another AS or confederation with their local AS number
(if not a confederation) or their confederation ID (if a confederation) by
entering:
/jointfilesconvert/97454/bgp#
peer 192.32.195.1/192.32.195.2 as 55
peer/192.32.195.1/192.32.195.2#
back
/jointfilesconvert/97454/bgp#
Note:
A sub-AS number cannot be the same as any external BGP peer AS;
however, internal sub-AS numbers can be assigned to a sub-AS in another
confederation. Suggestion: Use the reserved AS number range. (IANA
reserved numbers are 64512 through 65535.)
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