if-match extcommunity-list soo

The extended community attributes help flexibly control the route-policy. You can use the if-match extcommunity-list soo command to configure a node to filter routes based on the SoO extended community filter.

• Run the route-policy command to enter the Route-policy view.
• A route-policy may consist of multiple nodes. The relationship between the nodes is "OR". The system matches a route against the nodes in sequence. If the route matches a node, the route matches the route-policy, and the system no longer matches it against other nodes.
• Each node comprises a set of if-match and apply clauses. The if-match clauses define the filtering rules that are used to match certain route attributes. The relationship among if-match clauses of the same node that are based on different route attributes is AND. A route matches a node only when the route matches all the filtering rules specified in the if-match clauses of the node. The apply clauses specify actions. The relationship among if-match clauses of the same node that are based on the same route attribute is OR. The system matches routes against the if-match clauses in order. If a route matches an if-match clause, the system no longer matches the route against the rest if-match clauses. For example, the if-match community-filter 1 and if-match as-path-filter 1 configurations in node 10 are based on different route attributes. Therefore, the relationship among if-match clauses of this node is AND. The if-match community-filter 1 and if-match community-filter 2 configurations in node 20 are both based on the community attribute. Therefore, the relationship among if-match clauses of this node is OR. The apply clauses specify actions. If a route matches a node, the apply clauses set some attributes for the route.
  The if-match extcommunity-list soo command is applicable only to BGP routes and must work with the ip extcommunity-list soo command. For example:
• If the if-match extcommunity-list soo basic aaa command is used but the extended community filter 1 is not configured, all routes match the filtering rule.
• If the if-match extcommunity-list soo basic aaa command is used after the ip extcommunity-list soo basic aaa permit 1.2.3.4:5 command is used, the BGP routes with the SoO extended community attribute 1.2.3.4:5 are permitted.