Concurrent Routing And Bridging - Juniper JUNOSE SOFTWARE 11.2.X - LINK LAYER CONFIGURATION GUIDE 7-7-2010 Configuration Manual

Concurrent Routing and Bridging

Copyright © 2010, Juniper Networks, Inc.
Table 27: Default Subscriber Policies for Bridge Group Interfaces
(continued)
Packet/Attribute Type Default Subscriber Policy
MPLS Permit
Multicast Permit
PPPoE Permit
Relearn Permit
Unicast (user-to-user) Permit
Unknown unicast DA Deny
Unknown protocol Permit
You cannot change the default subscriber policy values listed in Table 27 on page 468 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" on page 478.
After you create the necessary bridge groups and bridge interfaces for your network
configuration, you can use the bridge crb command to enable concurrent routing and
bridging (CRB) for all bridge groups configured on your router. When CRB is enabled, the
router can route a protocol among a group of interfaces in one bridge group and
concurrently bridge the same protocol among a separate group of interfaces in a different
bridge group on the router.
The router does not switch the protocol between the two bridge groups. Instead, it
confines routed traffic to the routed interfaces and bridged traffic to the bridged interfaces.
As a result, a protocol can be either routed or bridged on a particular interface, but cannot
be both routed and bridged on the same interface.
By default, CRB is disabled for all bridge groups on the router. When you use the bridge
crb command to enable CRB, it takes effect for all bridge groups currently configured on
your router; you cannot enable CRB for some bridge groups on the router but not for
others.
When you first enable CRB, the router issues an implicit bridge route command for any
IP, MPLS, or PPPoE interfaces that are currently configured in the interface stack for the
bridge group. This command directs the bridge group to route traffic for these protocols.
After CRB has been enabled, you must issue an explicit bridge route command to route
any new IP, MPLS, or PPPoE interface that is the first occurrence of this protocol in the
bridge group. (See "Configuring Explicit Routing" on page 483 for details about using the
bridge route command.)
Chapter 15: Configuring Transparent Bridging
Default Trunk Policy
Permit
Permit
Permit
Permit
Permit
Permit
Permit
469