Routing Policy; Configuring Filters; Configuration Prerequisites; Configuring An Ip Prefix List - HP 6125XLG Layer 3 - Ip Routing Configuration Manual

For more information about extended community lists, see MPLS Configuration Guide.

Routing policy

A routing policy can contain multiple nodes, which are in a logical OR relationship. A node with a
smaller number is matched first. A route (except the route configured with the continue clauses) that
matches one node matches the routing policy.
Each node has a match mode of permit or deny.
permit—Specifies the permit match mode for a routing policy node. If a route matches all the
•
if-match clauses of the node, it is handled by the apply clauses of the node. The route does not
match against the next node unless the continue clause is configured. If a route does not match all
the if-match clauses of the node, it matches against the next node.
deny—Specifies the deny match mode for a routing policy node. The apply and continue clauses
•
of a deny-mode node are never executed. If a route matches all the if-match clauses of the node, it
is discarded and does not match against the next node. If a route does not match all the if-match
clauses of the node, it matches against the next node.
A node can contain a set of if-match, apply, and continue clauses.
if-match clauses—Configure the match criteria that match the attributes of routing information. The
•
if-match clauses are in a logical AND relationship. A route must match all the if-match clauses to
match the node.
apply clauses—Specify the actions to be taken on permitted routes, such as modifying a route
•
attribute.
• continue clause—Specifies the next node. A route that matches the current node (permit-mode node)
must match 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 only want to filter routes, do not configure apply clauses.
If you do not configure any if-match clauses for a permit-mode node, the node will permit all routes.
•
Configure a permit-mode node containing no if-match or apply clauses behind multiple deny-mode
•
nodes to allow unmatched routes to pass.

Configuring filters

Configuration prerequisites

Determine the IP prefix list name, matching address range, and community list number.

Configuring an IP prefix list

Configuring an IPv4 prefix list
If all the items are set to deny mode, no routes can pass the IPv4 prefix list. To allow other IPv4 routing
information to pass, you must configure the permit 0.0.0.0 0 less-equal 32 item following multiple deny
items.
To configure an IPv4 prefix list:
416