3Com 3C13636 Configuration Manual page 713

3Com Router 3000 Ethernet Family
Configuration Guide
Table 7-5 Define a route-policy
Enter routing policy view
Remove the specified route-policy
The argument permit specifies the matching mode for a defined node in the
route-policy to be in permit mode. If a route satisfies all the if-match clauses of the
node, it will pass the filtering of the node, and the apply clauses for the node will be
executed without taking the test of the next node. If not, however, the route should take
the test of the next node.
The deny argument specifies the matching mode for a defined node in the route-policy
to be in deny mode. In this mode, the apply clauses will not be executed. If a route
satisfies all the if-match clauses of the node, it will be denied by the node and will not
take the test of the next node. If not, however, the route will take the test of the next
node.
The nodes have the "OR" relationship. In other words, the router will test the route
against the nodes in the route-policy in sequence, once a node is matched, the
route-policy filtering will be passed.
By default, the route-policy is not defined.
Note: if multiple nodes are defined in a route-policy, at least one of them should be in
permit mode. Apply the route-policy to filter routing information. If the routing
information does not match any node, the routing information will be denied by the
route-policy. If all the nodes in the route-policy are in deny mode, all routing information
will be denied by the route-policy.
II. Defining if-match clauses for a route-policy
The if-match clauses define the matching rules. That is, the filtering conditions that the
routing information should satisfy for passing the route-policy. The matching objects are
some attributes of routing information.
Perform the following configuration in route-policy view.
Table 7-6 Define if-match conditions
Match the AS path domain of the BGP
routing information
Cancel the matched AS path domain of
the BGP routing information
Operation
Operation
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7-7
Chapter 7 IP Routing Policy Configuration
Command
route-policy route-policy-name { permit
| deny } node node-number
undo route-policy route-policy-name
[ permit | deny | node node-number ]
Command
if-match as-path aspath-acl-number
undo if-match as-path