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DSL Access Architectures and Protocols 189

Figure 8-6 RBE Protocol Stack

To conﬁgure RBE, follow these steps:

Step 1 Conﬁgure the ATM subinterface, and use aal5snap encapsulation. ip

unnumbered is used when subscribers are on the same subnet and to

conserve IP address space. You can use the ip address command if

subscribers are on different subnets.

interface atm

slot

/0.

subinterface-number

{multipoint | point-to-point}

ip unnumbered

interface-name-number

pvc [

name

]

vpi/vci

encapsulation aal5snap

Step 2 Associate the RBE command with the ATM subinterface:

atm route-bridged ip

Step 3 Deﬁne the static host route. It is required if the IP unnumbered conﬁguration

is used.

ip route

network-number

[

network-mask

] {

address

interface

} [

distance

]

[name

name

]

Example 8-10 demonstrates the RBE conﬁguration of the Cisco 6400 NRP.

Example 8-10 RBE Conﬁguration

interface Loopback0

ip address 192.168.1.1 255.255.255.0

no ip directed-broadcast

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

CPE DSLAM 6400 UAC

continues

0732x01.book Page 189 Monday, November 17, 2003 2:49 PM

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