Subscriber Policies

To enable intelligent flooding of packets within a bridge group’s broadcast domain, each bridge group interface you create is associated with a default subscriber policy. A subscriber policy is a set of forwarding and filtering rules that defines how the bridge group interface handles various packet or attribute types, as follows:

• For each packet type, the subscriber policy specifies whether you want the bridge group interface to permit (forward) or deny (filter or drop) packets of that type.
• For the relearn attribute, the subscriber policy specifies whether the bridge interface can relearn a MAC address entry on a different interface from the one initially associated with this entry in the forwarding table. Permit indicates that relearning is allowed, and deny indicates that relearning is prohibited.

The router provides two default subscriber policies: default Subscriber for subscriber (client) bridge interfaces, and default Trunk for trunk (server) bridge interfaces.

Table 22 lists the default values for each packet or attribute type defined in the default Subscriber and default Trunk policies. The only difference between the two policies is how broadcast packets and packets with unknown unicast destination addresses (DAs) are handled.

Table 22: Default Subscriber Policies for Bridge Group Interfaces

You cannot change the default subscriber policy values listed in Table 22 for a trunk bridge interface. You can, however, configure a nondefault subscriber policy for a subscriber bridge interface to change the default permit or deny value for one or more packet or attribute types. For details, see Configuring Subscriber Policies.

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