BGP Configuration Guide | Cabletron Systems 9032578-02 instruction

Chapter 6: BGP Configuration Guide

The community attribute may be a single community or a set of communities. A maximum of 10 communities may be specified.

The community attribute can take any of the following forms:

•Specific community

The specific community consists of the combination of the AS-value and community ID.

•Well-known-community no-export

Well-known-community no-export is a special community which indicates that the routes associated with this attribute must not be advertised outside a BGP confederation boundary. Since the SSR’s implementation does not support Confederations, this boundary is an AS boundary.

For example, router SSR10 in Figure 6 has the following configuration:

ip-router policy create	optional-attributes-list noexport well-known-
community no-export
ip-router policy create	bgp-export-destination 900to901dest autonomous-
system 64901 optional-attributes-list noexport
ip-router policy export	destination 900to901dest source 900to901src
network all
ip-router policy export	destination 900to901dest source 900to901dir
network all

•Well-known-community no-advertise

Well-known-community no-advertise is a special community indicating that the routes associated with this attribute must not be advertised to other bgp peers. A packet can be modified to contain this attribute and passed to its neighbor. However, if a packet is received with this attribute, it cannot be transmitted to another BGP peer.

•Well-known-community no-export-subconfed

Well-known-community no-export-subconfed is a special community indicating the routes associated with this attribute must not be advertised to external BGP peers. (This includes peers in other members’ autonomous systems inside a BGP confederation.)

A packet can be modified to contain this attribute and passed to its neighbor. However, if a packet is received with this attribute, the routes (prefix-attribute pair) cannot be advertised to an external BGP peer.

•Well-known-community none

This is not actually a community, but rather a keyword that specifies that a received BGP update is only to be matched if no communities are present. It has no effect when originating communities.

96	SmartSwitch Router User Reference Manual

9032578-02 specifications

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Cabletron Systems 9032578-02 manual BGP Configuration Guide

Models: 9032578-02

Chapter 6: BGP Configuration Guide

9032578-02 specifications