Brocade Communications Systems Layer 3 Routing Configuration ICX 6650 - Manual (Page 340)

322 Brocade ICX 6650 Layer 3 Routing Configuration Guide
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Optional BGP4 configuration tasks
• Configure the confederation ID. The confederation ID is the AS number by which BGP switches
outside the confederation know the confederation. Thus, a BGP switch outside the
confederation is not aware and does not care that your BGP switches are in multiple
sub-autonomous systems. BGP switches use the confederation ID when communicating with
switches outside the confederation. The confederation ID must be different from the sub-AS
numbers.
• Configure the list of the sub-AS numbers that are members of the confederation. All the
switches within the same sub-AS use IBGP to exchange switch information. Switches in
different sub-autonomous systems within the confederation use EBGP to exchange switch
information.
To configure four Layer 3 switches to be a member of confederation 10 (as shown in Figure 27 ),
consisting of two sub-autonomous systems (64512 and 64513), enter commands such as the
following.
Commands for router A
BrocadeA(config)#router bgp
BrocadeA(config-bgp-router)#local-as 64512
BrocadeA(config-bgp-router)#confederation identifier 10
BrocadeA(config-bgp-router)#confederation peers 64512 64513
BrocadeA(config-bgp-router)#write memory
Syntax: local-as num
The num parameter with the local-as command indicates the AS number for the BGP switches
within the sub-AS. You can specify a number from 1 through 65535. Brocade recommends that you
use a number within the range of well-known private autonomous systems, 64512 through 65535.
Syntax: confederation identifier num
The num parameter with the confederation identifier command indicates the confederation
number. The confederation ID is the AS number by which BGP switches outside the confederation
know the confederation. Thus, a BGP switch outside the confederation is not aware and does not
care that your BGP switches are in multiple sub-autonomous systems. BGP switches use the
confederation ID when communicating with switches outside the confederation. The confederation
ID must be different from the sub-AS numbers. You can specify a number from 1 through 65535.
Syntax: confederation peers num [num …]
The num parameter with the confederation peers command indicates the sub-AS numbers for the
sub-autonomous systems in the confederation. You must specify all the sub-autonomous systems
contained in the confederation. All the switches within the same sub-AS use IBGP to exchange
switch information. Switches in different sub-autonomous systems within the confederation use
EBGP to exchange switch information. You can specify a number from 1 through 65535.
Commands for router B
BrocadeB(config)#router bgp
BrocadeB(config-bgp-router)#local-as 64512
BrocadeB(config-bgp-router)#confederation identifier 10
BrocadeB(config-bgp-router)#confederation peers 64512 64513
BrocadeB(config-bgp-router)#write memory