Cisco Systems A9014CFD manual How to Configure IMA, 36-2

Chapter 36 Configuring Inverse Muliplexing over ATM

Feature Overview

Restrictions

The following features are not supported:

•Native ATM interfaces

•IP Routing

•VPI or VCI rewrite

•1:1 and N:1 (where N > 1) VCC or VPP mode

•up and down traps

•ATM class of service (CBR, VBR-RT, VBR-nRT, UBR+, and UBR) for VPCs and port-mode

•Transmission of AIS on VCCs and VPCs to the customer-edge s, when the pseudowire goes down.

•Enabling atm cell payload scrambling for T1

•Disabling atm cell payload scrambling for E1

Feature Overview

IMA involves inverse multiplexing and de-multiplexing of ATM cells in a cyclical fashion among physical links grouped to form a higher-bandwidth and logical link. Streams of cells are distributed in a round-robin manner across the multiple T1/E1 links and reassembled at the destination to form the original cell stream. Sequencing is provided using IMA Control Protocol (ICP) cells.

The following features are supported in this release:

•AAl0 and AAL5 encapsulation

•N:1 (where N == 1) VPC and VCC cell relay mode

•Cell packing and Maximum Cell Packing Timeout (MCPT) timers

•Port mode

•AAL5 SDU frame encapsulation

How to Configure IMA

This section describes how to configure IMA on E1/T1 interface and over MPLS:

•Configuring ATM IMA on T1/E1 Interface, page 36-3

•Configuring ATM IMA over MPLS, page 36-4

•How to Configure ATM Class of Service, page 36-11

•Configuring Marking MPLS Experimental Bits, page 36-17

	Cisco ASR 901 Series Aggregation Services Router Software Configuration Guide
36-2	OL-23826-09