Brocade Communications Systems FastIron SX 1600, Руководство по настройке, Страница: 393 / 593

devices in the confederation. Thus, devices in other autonomous systems see traffic as coming from AS 10 and are unaware that the
devices in AS 10 are subdivided into sub-autonomous systems within a confederation.
Configuring a BGP4 confederation
To configure a BGP4 configuration, perform these configuration tasks on each BGP4 device within the confederation:
• Configure the local AS number. The local AS number indicates membership in a sub-AS. All BGP4 devices with the same local
AS number are members of the same sub-AS. BGP4 devices use the local AS number when communicating with other BGP4
devices in the confederation.
• Configure the confederation ID. The confederation ID is the AS number by which BGP4 devices outside the confederation
recognize the confederation. A BGP4 device outside the confederation is not aware of, and does not care that BGP4 devices
are in multiple sub-autonomous systems. A BGP4 device uses the confederation ID to communicate with devices outside the
confederation. The confederation ID must differ from the sub-AS numbers.
• Configure the list of the sub-AS numbers that are members of the confederation. All devices within the same sub-AS use IBGP
to exchange device information. Devices in different sub-autonomous systems within the confederation use EBGP to exchange
device information.
To configure four devices to be members of confederation 10 (consisting of sub-autonomous systems 64512 and 64513), enter
commands such as the following.
Commands for device A
deviceA(config)# router bgp
deviceA(config-bgp-router)# local-as 64512
deviceA(config-bgp-router)# confederation identifier 10
deviceA(config-bgp-router)# confederation peers 64512 64513
deviceA(config-bgp-router)# write memory
Syntax: [no] local-as num
The num parameter with the local-as command indicates the AS number for the BGP4 devices within the sub-AS. You can specify a
number in the range 1 - 4294967295. I Brocade recommends that you use a number within the range of well-known private
autonomous systems, 64512 through 65535.
Syntax: [no] confederation identifier num
The num parameter with the confederation identifier command indicates the confederation number. The confederation ID is the AS
number by which BGP4 devices outside the confederation recognize the confederation. A BGP4 device outside the confederation is not
aware of, and does not care that your BGP4 devices are in multiple sub-autonomous systems. BGP4 devices use the confederation ID
when communicating with devices outside the confederation. The confederation ID must be different from the sub-AS numbers. For the
num parameter, you can specify a number in the range 1 - 4294967295.
Syntax: [no] 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 can list all sub-autonomous systems in the confederation. You must specify all the sub-autonomous systems with
which this device has peer sessions in the confederation. All the devices within the same sub-AS use IBGP to exchange device
information. Devices in different sub-autonomous systems within the confederation use EBGP to exchange device information. The
num
is a number in the range 1 - 4294967295.
Commands for device B
deviceB(config)# router bgp
deviceB(config-bgp-router)# local-as 64512
Optional BGP4 configuration tasks
FastIron Ethernet Switch Layer 3 Routing
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