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For more information about extended community lists, see
MPLS Configuration Guide
.
MAC list
A MAC list matches MAC addresses contained in EVI IS-IS packets.
A MAC list can contain multiple items that specify MAC address ranges. Each MAC address entry in an
EVI IS-IS packet is compared with these items in ascending order of their index numbers. A MAC address
entry matches the MAC list if it matches one item in the list.
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 matches the routing policy if it matches one node (except the
node configured with the
continue
clause) in 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 meets 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 meet 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 node are never executed. If a route meets all the
if-match
clauses of the node, it is
discarded and does not match against the next node. If a route does not meet 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—Specify the match criteria that match the attributes of routes. The
if-match
clauses
are in a logical AND relationship. A route must meet 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 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 node, the node will permit all routes.
•
Configure a permit node containing no
if-match
or
apply
clauses following multiple deny nodes to
allow unmatched routes to pass.
Configuring filters
Configuration prerequisites
Determine the IP prefix list name, matching address range, and community list number.
