Configuring if-match clauses
You can either specify no if-match clauses or multiple if-match clauses for a routing policy node. If no if-match clauses are specified for a permit-mode node, all routes can pass the node. If no if-match clauses are specified for a deny-mode node, no routes can pass the node.
The if-match clauses of a routing policy node have a logical AND relationship. A route must meet all if-match clauses before it can be executed by the apply clauses of the node. If an if-match command exceeds the maximum length, multiple identical if-match clauses are generated. These clauses have a logical OR relationship. A route only needs to match one of them.
To configure if-match clauses:
Step | Command | Remarks |
|---|---|---|
1. Enter system view. | system-view | N/A |
2. Enter routing policy node view. | route-policy route-policy-name { deny | permit } node node-number | N/A |
3. Match routes whose destination, next hop, or source matches an ACL or prefix list. |
| By default, no ACL or prefix list match criterion is configured. If the ACL used by an if-match clause does not exist, the clause is always matched. If no rules of the specified ACL are matched or the match rules are inactive, the clause is not matched. |
4. Match routes having the specified cost. | if-match cost value | By default, no cost match criterion is configured. |
5. Match routes having the specified output interface. | if-match interface { interface-type interface-number }&<1-16> | By default, no output interface match criterion is configured. |
6. Match IGP routes having the specified tag value. | if-match tag value | By default, no tag match criterion is configured. |