Cisco Cisco IOS Software Release 12.0(22)S

This feature module describes the Cisco 8-Port OC-3 STM-1 ATM line card and its use in the 
Cisco 12000 series Internet Routers.

This document includes information on the following sections:

The 8-Port OC-3 STM-1 ATM line card supports traffic shaping and delivers line rate OC-3/STM-1 
bandwidth while performing traffic shaping and per-virtual circuit (VC) queueing. It also supports 
per-VC Modified Deficit Round Robin (MDRR) with per-VC low latency queueing (LLQ).

MDRR is implemented on a per-VC basis, with up to eight queues per VC. One of the queues is a low 
latency queue (LLQ). Both per-VC Weighted Random Early Detection (WRED) and per-VC MDRR are 
performed in hardware.

The 8-Port OC-3 STM-1 ATM line card provides the Cisco 12000 series product line with eight 
155 Mbps ATM interfaces. The card communicates with the Cisco 12000 series product line switch 
fabric.

12.0(22)S

This feature was introduced on Cisco 12000 series Internet Routers.

12.0(23)S

Software support for the 8-Port OC-3 STM-1 ATM line card was expanded 
to include ATM Cell Loss Priority (CLP) bit setting, ATM virtual circuit 
(VC) bundle management, MPLS virtual private network (VPN) Carrier 
supporting Carrier (CsC), MPLS VPN Inter-Autonomous Systems 
(Inter-AS), and 128-line input Access Control Lists (ACLs).