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Cisco Catalyst 8500 Series Campus Switch Routers

Field Notice: FN - 4948 - Cell Loss Between DS3/T1 and OC-3 on the Same SCAM


Revised April 24, 2007

June 8, 1999

NOTICE:

THIS FIELD NOTICE IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTY OF MERCHANTABILITY. YOUR USE OF THE INFORMATION ON THE FIELD NOTICE OR MATERIALS LINKED FROM THE FIELD NOTICE IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS FIELD NOTICE AT ANY TIME.


Products Affected

  • C8540MSR

  • C85MS-SCAM-2P=

Problem Description

Customers may experience cell loss between lower speed Port Adapter Modules (PAMs). Small packets have partial success, but cell loss increases as packet size increases and is total at about 1000 bytes.

Background

PAMs of less than OC-3 rates experience cell drops on transfers within the same Super CAM (SCAM) on Catalyst 8540MSR platforms. There is a problem with how the Field Programmable Gateway Array (FPGA) image on the SCAM handles backpressure.

Problem Symptoms

A cell loss problem exists between lower speed PAMs (below OC-3 rates) that are installed in the same SCAM (C85MS-SCAM-2P=) on all SCAMs whose FPGA image is lower that 1.5.

Details are explained in DDTS CSCdm12694 (registered customers only) .

Workaround/Solution

The solution is to upgrade the FPGA image to fi-c8540-scam.A.1-5. This image is available on CCO at the FPGA Download Page (registered customers only) :

For More Information

If you require further assistance, or if you have any further questions regarding this field notice, please contact the Cisco Systems Technical Assistance Center (TAC) by one of the following methods:

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