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260 CHAPTER 16: IP ROUTING PROTOCOL OPERATION
Defining a Route Policy
A route policy can include multiple nodes. Each node is a unit for the matching
operation. The nodes are tested against the
node_number.
Perform the following configurations in System View.
The
permit parameter specifies that if a route satisfies all the if-match clauses of a
node, the route passes the filtering of the node, and the
apply clauses for the node
are executed without taking the test of the next node. If a route does not satisfy all
the
if-match clauses of a node, however, the route takes the test of the next node.
The deny parameter specifies that the apply clauses are not executed. If a route
satisfies all the
if-match clauses of the node, the node denies the route and the
route does not take the test of the next node. If a route does not satisfy all the
if-match clauses of the node, however, the route takes the test of the next node.
The router tests 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.
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 policy denies the routing
information. If all the nodes in the route policy are in deny mode, all routing
information is denied by the route policy.
Defining If-match Clauses for a Route-policy
The
if-match clauses define the matching rules that the routing information must
satisfy to pass the route policy. The matching objects are attributes of the routing
information.
Perform the following configurations in Route Policy View.
Table 253 Defining a route-policy
Operation Command
Enter Route Policy View route-policy route_policy_name { permit |
deny } node { node_number }
Remove the specified route-policy undo route-policy route_policy_name [
permit | deny | node node_number ]
Table 254 Defining if-match Conditions
Operation Command
Match the destination address of
the routing information
if-match { acl acl_number | ip-prefix
ip_prefix_name }
Cancel the matched destination
address of the routing information
undo if-match { acl | ip-prefix }
Match the next-hop interface of the
routing information
if-match interface{ interface_type_
interface_number }
Cancel the matched next-hop
interface of the routing information
undo if-match interface
Match the next-hop of the routing
information
if-match ip next-hop { acl acl_number |
ip-prefix ip_prefix_name }