Cisco MGX 8200 Series Edge Concentrators

Field Notice: CSCdu16536 and CSCdx35791 Terminal Server or Modem Configuration Can Cause PXMs to Fail to Boot Up.

October 05, 2004

Products Affected




Operating with Releases prior to 1.3.10


Operating with Releases prior to 1.3.10


Operating with Releases prior to 1.3.10


Operating with Releases prior to 1.3.10


Operating with Releases prior to 2.1.75


Operating with Releases prior to 2.1.75

Problem Description

Misconfiguration of Terminal Server or Modem attached to the console port of a PXM may cause failure to boot up.

For the purposes of this field notice, PXM refers only to the items listed in the Products Affected section, above. PXM1E models are not affected by these anomalies.


MGX switches are often accessed via the console port located on the PXM-UI card. The console port supports connectivity to Terminal Servers or Modems. However, these must be configured correctly for proper operation.

Problem Symptoms

The primary symptom is that the PXM will not boot up. The fail LED will remain lit.



Two items must be configured on the Terminal Server port or the Modem port.

  1. Disable flow control on the Terminal Server or Modem.

  2. Disable echo mode on the Terminal Server or Modem.


Upgrade the PXM to a release of software that resolves this problem.

For PXM1 models, upgrade to release 1.3.10 or later.

For PXM45 models, upgrade to release 2.1.80 or later.

Note:?replacing the card will not resolve the problem.

Recovering the PXM from this anomally:

These steps should be followed to recover the PXM when it fails boot up.

  1. Disconnect the cable attached to the console port.

  2. Physically reseat the affected PXM.


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



CSCdu16536 (registered customers only)

After setrev pxm45 failed to come up, no applications invoked

CSCdx35791 (registered customers only)

PXM card fails to boot

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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