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DES-7200 Configuration Guide Chapter 6 BGP
Configuration
6-26
Command Function
[address mask]
of all routes, and release the
suppressed routes.
6.16 Configuring AS Confederation for BGP
The confederation is a measure to reduce the connections of the IBGP peer
within the AS.
One AS is divided into multiple sub ASs that can form a confederation by setting a
unified confederation ID (namely, confederation AS number). An external
confederation is still considered to be an AS and only the AS number of the
confederation is visible. Within the confederation, the full IBGP peer connection is
still established among the BGP Speakers and the EBGP connection is
established among the BGP Speakers within the sub AS. Although the EBGP
connection is established among BGP Speakers within the sub ASs, the path
attribute information of NEXT_HOP, MED and LOCAL_PREF retains intact when
the information is exchanged.
To implement the AS confederation, execute the following operations in the BGP
configuration mode:
Command Function
DES-7200(config-router)# bgp
confederation identifier as-number
Configure the AS confederation
number.
The range of as-number is 1 to
65535.
DES-7200(config-router)# bgp
confederation peers as-numbe
[as-number..]
Configure other sub AS numbers
within the AS confederation.
The range of as-number is 1 to
65535.
Use the no mode of above commands to disable the configured content.
6.17 Configuring BGP Management Distance
The management distance indicates the reliability of the route information
resource, whose range is 1 to 255. The larger the value of the management
distance, the lower the reliability is.
The BGP sets different management distances for various information sources
learned, such as External-distance, Internal-distance and Local-distance.
External-distance: The management distance of the route learned from the
EBGP peers.