1-20
Cisco 3825 Mobile Wireless Edge Router Software Configuration Guide
OL-15667-03
Chapter 1 Overview of the Cisco 3825 Mobile Wireless Edge Router
New Features in Cisco IOS Release 12.4(16)MR1
Transportation of ATM Service via L2TPv3
This service transports ATM services over IP networks. It allows you to migrate all PSNs from ATM
legacy networks while still providing ATM legacy services.
The following PW modes are supported in this release:
• ATM Port Cell Relay Service, page 1-20
• ATM VCC Cell Relay Service, page 1-20
• ATM AAL5-SDU Mode, page 1-21
Configuring Layer 2 Tunnel Protocol version 3 (L2TPv3)-based PWs is very similar to configuring
MPLS-based PWs, except that a pseudowire-class command is required to be configured for
L2TPv3-based PWs.
A sample configuration of the L2TPv3 pseudowire-class command is written as follows:
pseudowire-class l2tp
encapsulation l2tpv3
sequencing both
ip local interface Loopback0

ATM Port Cell Relay Service

ATM port mode maps the entire ATM interface to a PW. Use the xconnnect command under the interface
mode to configure a port mode PW. The ATM interface maps to the PW.
A sample configuration is written as follows:
interface ATM0/0/0
no ip address
scrambling-payload
atm mcpt-timers 1000 2000 3000
no atm ilmi-keepalive
atm cell-packing 28 mcpt-timer 3
xconnect 99.99.99.99 100 pw-class l2tp
pvc 1/35 l2transport
encapsulation aal0
!
pvc 1/36 l2transport
encapsulation aal0
!
pvc 1/37 l2transport
encapsulation aal0
!
!

ATM VCC Cell Relay Service

ATM N:1 VCC cell relay mode maps one or more PVCs to one PW. There are two ways to configure N:1
VCC in cell relay mode:
1. When only one PVC needs to be mapped to the PW, configure the xconnect command under the
PVC mode to configure a N:1 VCC cell relay mode PW.
A sample configuration is written as follows:
interface ATM0/0/1
no ip address
load-interval 30
scrambling-payload