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Cisco IOS Software Releases 12.1 Mainline

Field Notice: *Expired* FN - 14015 - Transparent Bridging Into DLSw/TCP Problem


Revised October 11, 2006

June 15, 2001

THIS FIELD NOTICE HAS BEEN ARCHIVED AND IS NO LONGER MAINTAINED OR UPDATED BY CISCO.

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


Products Affected

All platforms running Cisco IOS® Software Release 12.1(8)

Problem Description

When using data-link switching (DLSw) Transmission Control Protocol (TCP) with Cisco IOS software 12.1(8) with an ethernet connection into DLSw, the Logical Link Control (LLC) session on the DLSw router can get stuck in REJECT state.

Background

  • CSCds75669: Problem with bridged DECnet traffic, introduced first in 12.1(7.2).

  • CSCdt67276: Problem with large packets failing over bridged X.25.

  • CSCdu43134: Problem with ethernet bridging into DLSw/TCP.

Problem Symptoms

When running transparent bridging into DLSw/TCP, the LLC session on the DLSw router can get stuck in REJECT state. After a while the other end of the LLC stack (normally a mainframe front-end) will disconnect the circuit. Only LLC2 sessions that originate via a transparent bridge group are affected, meaning a session originated on a TR coming into the router via source-route bridging (SRB) works fine.

Workaround/Solution

A workaround is reconfiguring from TCP to Fast Sequenced Transport (FST) encapsulation. The Fix is integrated in Cisco IOS 12.1(8.1). The next maintenance release, which is 12.1(9), will have the fix as well.

DDTS

To follow the bug ID link below and see detailed bug information, you must be a registered user and you must be logged in.

DDTS

Description

CSCds75669 (registered customers only)

Problem with bridged DECnet traffic, introduced first in 12.1(7.2)

CSCdt67276 (registered customers only)

Problem with large packets failing over bridged X.25

CSCdu43134 (registered customers only)

Problem with ethernet bridging into DLSw/TCP

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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