Juniper JUNOSE 11.2.X BGP AND MPLS, Configuration Manual

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For each packet type listed in Table 112 on page 578, the subscriber policy specifies
whether the network interface permits (forwards) or denies (filters or drops) packets
of that type.
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For the relearn attribute, the subscriber policy specifies whether the network 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; deny
indicates that relearning is prohibited.
Table 112 on page 578 lists the default values for each packet or attribute type defined in
the policies for subscriber interfaces and trunk interfaces. The default subscriber policy
differs in one way from the default trunk policy: broadcast packets and packets with
unknown unicast destination addresses (DAs) are denied in the subscriber policy and
permitted in the trunk policy.
Table 112: Default Subscriber Policies for VPLS Network Interfaces
Default Trunk Policy Default Subscriber Policy Packet/Attribute Type
Permit Permit ARP
Permit Deny Broadcast
Permit Permit IP
Permit Permit MPLS
Permit Permit Multicast
Permit Permit PPPoE
Permit Permit Relearn
Permit Permit Unicast (user-to-user)
Permit Deny Unknown unicast DA
Permit Permit Unknown protocol
Modifying Subscriber Policies
For a network interface configured as a subscriber (client) interface, you can modify the
default subscriber policy to change the default permit or deny value for one or more of
the packet or attribute types listed in Table 112 on page 578.
You cannot, however, change the default trunk policy for a network interface configured
as a trunk interface or for the VPLS virtual core interface. Trunk interfaces and the VPLS
virtual core interface always use the default trunk policy, which forwards packets of all
types and permits relearning.
Copyright © 2010, Juniper Networks, Inc. 578
JunosE 11.2.x BGP and MPLS Configuration Guide