Cisco 3825 - Manual (Page 27)

1-17
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 MPLS/IP (PWE3/ATM)
An ATM PW is used to carry ATM cells over an MPLS network. It is an evolutionary technology that
allows you to migrate all packet networks from legacy ATM networks, yet provides transport for legacy
applications.
Configuration for provisioning and creating the PW is done through the existing xconnect command.
The following PW modes are supported in this release:
• Transparent Cell Transport Service/ATM Port Mode, page 1-17
• ATM N-to-One VCC Cell Mode, page 1-17
• ATM AAL5 CPCS-SDU Mode, page 1-18
• ATM VCC Cell Relay Service, page 1-20
The following examples illustrates how different modes of PWs are configured.
Transparent Cell Transport Service/ATM Port Mode
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.
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 encapsulation mpls sequencing both
pvc 1/35 l2transport
encapsulation aal0
!
pvc 1/36 l2transport
encapsulation aal0
!
pvc 1/37 l2transport
encapsulation aal0
!
ATM N-to-One VCC Cell Mode
ATM N:1 VCC cell relay mode maps one or more permanent virtual circuits (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 a 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
atm mcpt-timers 1000 2000 3000
no atm ilmi-keepalive
pvc 0/101 l2transport
encapsulation aal0
cell-packing 28 mcpt-timer 3