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catalyst 4507 Rswitch boot intermittently

Hi all,

The switch 4507R chassis has dual WS--X4516

supervisor engines. The switch today intermittently re-boot itself.When I after removed the primary supervisor from the chassis, the switch works.

What is the cause of the problem.

Waiting for your reply.

sami

1 REPLY

Re: catalyst 4507 Rswitch boot intermittently

Sami,

Hopes you're not facing SDRAM degradation. (grin)

Field Notice: FN - 62479 - WS-X4516-10GE and WS-X4013+10GE Supervisors May Reset Due to Multibit ECC Error

Background

Cisco has found that the above Cisco Supervisor models have a potential to experience SDRAM degradation. This could result in switch reloads. In advanced circumstances when SDRAM has degraded extensively, the switch could reload and hang on reboot. Factors which influence the extent of SDRAM degradation are the length of time the supervisor has been in operation along with network traffic patterns that affect SDRAM access. The extent of degradation is not easily quantifiable. In a chassis with redundant supervisors, both the active and standby units can experience SDRAM degradation.

#####################################

CSCsd63410 Bug Details

Multibit ECC errors on SupV-10GE, SupII+10GE

Symptom:

SupV-10GE or SupII+10GE may reset due to multibit ecc error. This

problem has been root-caused to SDRAM.

Conditions:

If either active/standby supervisor (in redundant system) or a standalone

system reloads and reenters IOS examine crashdump for multibit-ecc error signature.

The signature located in the crashdump will include:

a) vector=00000000

b) ErrDetect=x000000Y

where x can be any value, and Y can range from hex 8 to F

In severe cases the active/standby unit can reload and then hang while booting

IOS. While connected to console reset the unit and if system hangs after

several hash prompts "###########" the problem would be identified.

Workaround:

Replace the SDRAM on failed supervisor and also upgrade ROMMON to 12.2(31r)SGA

or higher. The SDRAM chips can be ordered by filling out the upgrades request

form (while upgrade program is active) in the field notice

http://www.cisco.com/en/US/customer/products/hw/switches/ps4324/products_field_notice09186a0080715457.shtml

Further Problem Description:

None.

##########################

HTH,

Toshi

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