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