Dell Force10 E600i FTOS Version 8.4.1.5 Configuration Guide for ExaScale - Page 157
Route Maps, Implementation Information, Important Points to Remember
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remark 8 this remark corresponds to permit ip any host 1.1.1.2 seq 8 permit ip any host 1.1.1.2 seq 10 permit ip any host 1.1.1.3 seq 12 permit ip any host 1.1.1.4 Route Maps c e s Route-maps are supported on platforms: Like ACLs and prefix lists, route maps are composed of a series of commands that contain a matching criterion and an action, yet route maps can change the packets meeting the criterion. ACLs and prefix lists can only drop or forward the packet or traffic. Route maps process routes for route redistribution. For example, a route map can be called to filter only specific routes and to add a metric. Route maps also have an "implicit deny." Unlike ACLs and prefix lists, however, where the packet or traffic is dropped, in route maps, if a route does not match any of the route map conditions, the route is not redistributed. Implementation Information The FTOS implementation of route maps allows route maps with no match command or no set command. When there is no match command, all traffic matches the route map and the set command applies. Important Points to Remember • For route-maps with more than one match clause: • Two or more match clauses within the same route-map sequence have the same match commands (though the values are different), matching a packet against these clauses is a logical OR operation. • Two or more match clauses within the same route-map sequence have different match commands, matching a packet against these clauses is a logical AND operation. • If no match is found in a route-map sequence, the process moves to the next route-map sequence until a match is found, or there are no more sequences. • When a match is found, the packet is forwarded; no more route-map sequences are processed. • If a continue clause is included in the route-map sequence, the next or a specified route-map sequence is processed after a match is found. IP Access Control Lists (ACL), Prefix Lists, and Route-maps | 157
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