3com 3031 Instruccion De Instalación

C

HAPTER

 34: IP M

ULTICAST

 P

OLICY

 R

OUTING

 C

ONFIGURATION

For a multicast packet, if IP multicast policy routing is configured on the incoming 
interface and the packet meets the match conditions of IP multicast policy routing, 
the packet will be forwarded according to the actions set by the policy routing. 
Otherwise, the packet will be forwarded according to the usual forwarding 
process. The forwarding process is described as follows:

1 Check whether IP multicast policy routing is configured on the incoming interface.

2 If a multicast policy is configured, check whether a packet meets the match 

conditions defined by the if-match statement. Otherwise, the packet will be 
forwarded according to the usual multicast forwarding process.

3 The data packet is forwarded.

I

P Multicast Policy Routing Configuration includes:

■

Define a route-policy

■

Define the if-match clause for IP multicast routing policy

■

Define the apply clause of the route-policy

■

Enable IP multicast policy routing on an interface

Multiple policy-nodes with different conditions and actions can be configured in a 
route-policy. Each policy-node has its own

 if-match

 clauses and 

apply

 clauses. 

Their match order is specified by 

.

Perform the following in the System View.

When IP multicast policy routing is configured on an interface of a router, all 
multicast data packets that enter the router from this interface will be filtered. The 
filtering method is that all policy-nodes of the route-policy specified by the policy 
routing are processed in order of the 

from small to large.

Note that the relationship among all parts of different 

 is “or”, 

that is, the packet pass by every node of different 

 in sequence. 

If packet can match if-match clause of one node, the packet will be forwarded by 
the apply clause of the node and not reach all the following nodes.

An

 if-match

 clause defines the match rule, which is the filtering condition that 

should be met by the packets to pass the current route-policy.

Perform the following in the Route-policy View.

Table 470   Defining a route-policy

Define a policy-node of 
the route-policy

route-policy policy-name { permit | deny } node 
sequence-number

Remove a policy-node of 
the route-policy

undo route-policy policy-name [ permit | deny ]