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DSL Access Architectures and Protocols 187

remote end. Bridge groups are deﬁned by associating VCs with each other. Bridge groups can

be deﬁned in several ways. Bridge members can communicate only with a network host,

between each member and use IRB to route out of the bridge.

Bridge Group Virtual Interface (BVI) is a virtual interface that resides in the Cisco 827 and

NRP. It acts as an interface between a bridge group and a routed interface. When conﬁgured for

IRB, the BVI is assigned a number that corresponds to the bridge group that is used to associate

the bridge group with the BVI. BVI is used as routed interface with network-layer attributes

such as IP address, ﬁltering, and so on. On BVI, routing is enabled on a per-protocol basis. BVI

allows you to route a given protocol between routed interfaces and bridge groups. Figure 8-5

illustrates the RFC 1483 bridging protocol stack.

Figure 8-5 RFC 1483 Bridging Protocol Stack

To conﬁgure IRB, follow these steps:

Step 1 Enable IRB with the following code:

bridge irb

Step 2 Specify the bridge protocol to deﬁne the type of Spanning Tree Protocol:

bridge

bridge-group

protocol {ieee | dec}

Step 3 Specify a protocol to be routed in a bridge group:

bridge

bridge-group

route

protocol

Step 4 Conﬁgure the ATM subinterface and aal5snap encapsulation:

interface atm

slot

/0.

subinterface-number

{multipoint | point-to-point}

pvc [

name

]

vpi/vci

encapsulation aal5snap

AT M

ADSL

AT M

PHY

802.3

CAT 5

802.3

CAT 5

1483

AT M

ADSL

1483

AT M

PHY

802.3

1483 over ATM

CPE DSLAM

ATM PVC

6400 UAC

0732x01.book Page 187 Monday, November 17, 2003 2:49 PM

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