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For more information about extended community lists, see
MPLS Configuration Guide
.
MAC list
A MAC list matches the destination MAC address of EVI IS-IS routing information.
A MAC list, identified by name, can comprise multiple items. Each item, identified by an index number,
specifies a MAC address range. An item with a smaller index number is matched first. A route that
matches one item matches the MAC list.
Routing policy
A routing policy can comprise 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 and does not match
against the next node unless the
continue
clause is configured. If not, 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 comprise 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—Specify 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.
