Product Bulletin, No. 1685

Cisco IOS X-Release 12.2(2)YC

Introduction

This Product Bulletin describes the content and delivery information concerning Cisco IOS(TM) software release 12.2(2)YC. 12.2(2)YC is a Early Deployment (ED) release parented to splob_flo_t_pi4 and supporting the Catalyst 4224 Access Gateway Switch. 

The platform and features delivered with this ED release will be incorporated into Cisco IOS 12.2(10)T and subsequent Cisco IOS releases.

New Features in Cisco IOS Release 12.2(2)YC

The following new features are supported on the Catalyst 4224 in release 12.2(2)YC:

• Low Latency Queuing (LLQ)
• Frame Relay Traffic Shaping (FRTS)

Detailed Information

Low Latency Queuing (LLQ):

LLQ combines the use of a Priority Queue (PQ) with a class-based weighted fair queuing (CBWFQ) scheme. Classes are defined with classification admission schemes. Traffic flows have access to either the PQ, one of the class-based queues, or a default weighted fair queue. LLQ, the recommended queuing scheme for all low-speed links, allows up to 64 traffic classes with the ability to specify such parameters as priority queuing behavior for voice, a minimum bandwidth for Systems Network Architecture (SNA) data, and Cisco AVVID control protocols and weighted fair queuing for other traffic types.

Frame Relay Traffic Shaping:

In Frame-Relay networks, where the physical access speed varies between two endpoints, traffic shaping is used to prevent excessive delay from congested network interface buffers caused by these speed mismatches. Traffic shaping is a tool that meters the transmit rate of frames from a source router to a destination router. This metering is typically done at a value that is lower than the line or circuit rate of the transmitting interface. The metering is done at this rate to account for the circuit speed mismatches that are common in current multiple-access, non-broadcast networks.

Support

Cisco IOS software release 12.2(2)YC follows the standard Cisco support policy as indicated in the following link.

http://www.cisco.com/warp/public/437/27.html

Product Numbers

Download Information

Customers can download Cisco IOS Release 12.2(2)YC software from Cisco Connection Online (CCO) in the Software Image Library.

http://www.cisco.com/public/sw-center/sw-ios.shtml