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You can disable synchronization if one of the following conditions is true: • • Your AS does not pass traffic from one AS to another AS. All the transit routers in your AS run BGP. BGP and Route Maps Route maps are used with BGP to control and modify routing information and to define the conditions by which routes are redistributed between routing domains. The format of a route map is as follows: route-map map-tag permit Designing Large-Scale IP Internetworks 3-35 BGP Internetwork Design Guidelines The map-tag is a name that identifies the route map, and the sequence-number indicates the position that an instance of the route map is to have in relation to other instances of the same route map.

Route reflectors ease this limitation and allow a router to advertise (reflect) IBGP-learned routes to other IBGP speakers, thereby reducing the number of IBGP peers within an AS. The network shown in Figure 3-39 demonstrates how route reflectors work. 3-62 Internetwork Design Guide Understanding and Defining BGP Routing Policies Figure 3-39 imple route reflector example. 2 Router B 16612 Router C Without a route reflector, the network shown in Figure 3-39 would require a full IBGP mesh (that is, Router A would have to be a peer of Router B).

By specifying that the update must also end with 200, the access list permits updates from AS 400 (whose AS_path attribute is 200, 400). If the access list specified ^200 as the regular expression, updates from AS 400 would be denied. ) symbol means any character, and the asterisk (*) symbol means a repetition of that character. * matches any value of the AS_path attribute, which in effect permits any update that has not been denied by the previous access-list statement. If you want to verify that your regular expressions work as intended, use the following EXEC command: show ip bgp regexp regular-expression The router displays all of the paths that match the specified regular expression.

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