Enterasys-networks Security Router X-PeditionTM Manual de usuario descargar pdf (Pagina 158)

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101

Overview

6-10 Configuring the Border Gateway Protocol

learn, advertise, or redistribute routes. When routes are aggregated, the resulting aggregate has a

COMMUNITIES attribute that contains all communities from all the initial routes.

Community lists form groups of communities for use in a route map’s match clause. Similar to

ACLs, you can create a series of community lists where statements are checked until a match is

found and when one statement is satisfied, the test is finished with the

ip community-list

community-list-number {permit | deny} community-number

command.

To configure the COMMUNITIES attribute and match clauses based on communities, refer to the

match community-list and set community command descriptions in “BGP Community with

Route Maps Examples” on page 6-26 and the XSR CLI Reference Guide.

Although a COMMUNITIES attribute is not sent to a neighbor by default, you can specify the

attribute be sent to the neighbor at an IP address with the

neighbor {ip-address | peer-

group-name} send-community

command.

Figure 6-7 Application of Community Attribute

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