HP 6125G Configuration Manual page 264

An IP prefix list, identified by name, can comprise multiple items. Each item, identified by an index
number, can specify a prefix range to match. An item with a smaller index number is matched first. If one
item is matched, the IP prefix list is passed, and the packet will not go to the next item.
AS path list
An AS path list, configured based on the BGP AS_PATH attribute, can only be used to match BGP routing
information.
For more information about AS path list, see "Configuring BGP."
Community list
A community list, configured based on the BGP COMMUNITY attribute, can only be used to match BGP
routing information.
For more information about community list, see "Configuring BGP."
Extended community list
An extended community list, configured based on the BGP extended community attribute (Route-Target
for VPN), can only be used to match BGP routing information.
Routing policy
A routing policy is used to match routing information and modify the attributes of permitted routes. It can
reference the filters to define its own match criteria.
A routing policy can comprise multiple nodes, which are in logic OR relationship. Each routing policy
node is a match unit, and a node with a smaller number is matched first. Once a node is matched, the
routing policy is passed and the packet will not go to the next node.
A routing policy node comprises a set of if-match, apply, and continue clauses.
• The if-match clauses define the match criteria. The matching objects are some attributes of routing
information. The if-match clauses of a routing policy node is in a logical AND relationship. A
packet must match all the if-match clauses of the node to pass it.
The apply clauses of the node specify the actions to be taken on the permitted packets, such as
•
modifying a route attribute.
The continue clause specifies the next routing policy node to be matched. With this clause
•
configured, when a route matches the current routing policy node, it continues to match against the
specified next node in the same routing policy. The continue clause combines the if-match and
apply clauses of the two nodes to improve flexibility of the routing policy.
Follow these guidelines when you configure if-match, apply, and continue clauses:
If you want to implement route filtering only, you do not need to configure apply clauses.
•
If you do not configure any if-match clauses for a permit-mode node, the node permits all routes to
•
pass.
Configure a permit-mode node containing no if-match or apply clauses behind multiple deny-mode
•
nodes to allow unmatched routes to pass.
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