3Com Switch 4500 26-Port, Configuration Manual

Page: 126 / 396

124 C
HAPTER
6: IP R
OUTING
P
ROTOCOL
O
PERATION
By default, no matching is performed.
The
if-match
clauses for a node in the route policy require that the route satisfy
all the clauses to match the node before the actions specified by the
apply
clauses
can be executed.
If no
if-match
clauses are specified, all the routes will pass the filtering on the
node.
Defining Apply Clauses for a Route Policy
The
apply
clauses specify actions, which are the configuration commands
executed after a route satisfies the filtering conditions that are specified in the
if-match
clauses. In this way, some attributes of the route can be modified.
Perform the following configurations in Route Policy View.
By default, no apply clauses are defined.
Importing Routing Information Discovered by Other Routing Protocols
A routing protocol can import the routes that are discovered by other routing
protocols to enrich its route information. The route policy can filter route
information to implement the redistribution. If the destination routing protocol
that imports the routes cannot directly reference the route costs of the source
routing protocol, you should satisfy the requirement of the destination protocol by
specifying a route cost for the imported route.
In different routing protocol views, the parameter options are different. For
details, refer to the description of the
import-route
command for each protocol.
Defining IP Prefix
A prefix list is identified by the IP Prefix name. Each IP Prefix can include multiple
items, and each item can specify the matching range of the network prefix forms.
The
index_number
specifies the matching sequence in the prefix list.
Cancel the matched next-hop of
the routing information set by the
address prefix list
undo if-match ip next-hop ip-prefix
Match the routing cost of the
routing information
if-match cost cost
Cancel the matched routing cost of
the routing information
undo if-match cost
Table 124 Defining Apply Clauses
Operation Command
Set the routing cost of the routing information
apply cost value
Cancel the routing cost of the routing information
undo apply cost
Table 123 Defining if-match Conditions
Operation Command