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Cisco Catalyst 3750 Series Switches

Field Notice: FN - 63024 - C3750G-12S Upgrade to 12.2(35)SE and Later May Fail Due to Incompatible Bootloaders


January 7, 2008

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.


Revision History

Revision

Date

Comment

1.0

07-JAN-2008

Initial Public Release

Products Affected

Products Affected

C3750 - WS-C3750G-12S-E

C3750 - WS-C3750G-12S-S

C3750 - WS-C3750G-12S-SD

Problem Description

WS-C3750G-12S switches having the following four bootloader versions and upgrading to Cisco IOS Release 12.2(35)SE or later will run into a booting loop problem and fail to upgrade.

  1. 12.1(14)EA1

  2. 12.1(19r)Ea1b

  3. 12.2(25r)SEB1

  4. 12.2(25r)SEC

Background

Cisco IOS Release 12.2(35)SE or later software goes into a loop trying to upgrade the older bootloaders as the code is unable to recognize the bootloader versions. This issue only affects WS-C3750G-12S hardware.

Problem Symptoms

This problem may exhibit the following symptoms:

Upgrade fails.

The switch will run into a booting loop.

Workaround/Solution

Do not attempt to upgrade to Cisco IOS Release 12.2(35)SE and later if Cisco Catalyst C3750G-12S switches have the above listed bootloader versions. Please see the How to Identify Affected Units section for details.

The issue will be solved in the next software release: 12.2(44)SE.

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

CSCsk29724 (registered customers only)

3750 enters boot loop trying to upgrade bootloader after IOS upgrade

How To Identify Affected Units

Table 1.1: The affected products and Boot loader versions are as follows:

Affected Product ID

Affected Version ID

Affected Bootloader Version

WS-C3750G-12S-SD

ALL

12.1(14)EA1, 12.1(19r)Ea1b, 12.2(25r)SEB1, 12.2(25r)SEC

WS-C3750G-12S-S

ALL

12.1(14)EA1, 12.1(19r)Ea1b, 12.2(25r)SEB1, 12.2(25r)SEC

WS-C3750G-12S-E

ALL

12.1(14)EA1, 12.1(19r)Ea1b, 12.2(25r)SEB1, 12.2(25r)SEC

In all products above, prior to upgrading, the Boot loader version must be used to identify an affected unit.

Step 1: Pre-upgrade Identification

Prior to an upgrade, the show version command can be used to identify the affected switches. Below is an example of the show version command output of an affected unit - the Boot loader versions match the affected criteria.

SWITCH>show version | include BOOTLDR 

BOOTLDR: C3750 Boot Loader (C3750-HBOOT-M) Version 12.2(25r)SEB1, RELEASE SOFTWARE (fc)

Step 2:

If the Boot loader version matches the listed Boot loader in Table 1.1, don't precede with an upgrade to 12.2(35)SE and later.

How to recover a switch post upgrade with the affected bootloader:

Use the following URL for Step-by-Step Recovery Procedure:

Step-by-Step Recovery Procedure

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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