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6500 IPC question


Iam regularly getting the below message in the log of a 6500 sup 720-3b (s72033-advipservicesk9_wan-mz.122-18.SXF10a.bin)

Apr 28 21:21:16: %IPC-5-WATERMARK: 2131 messages pending in rcv for the port Card5/1:Request(2150000.5) seat 2150000.

It doesn't seem to be causing a problem, CPU is OK, and I can't find any bugs directly relating to this. Any ideas.

Hall of Fame Super Silver

Re: 6500 IPC question

Hello Chris,

have you got a supervisor in slot 5 ?

How many supervisors are in the chassis ?

IPC should stand for inter process communication and the message should complain of an high number of messages sitting in a queue waiting to be processed or dispatched.

As you have already checked this is the output from error message decoder

1. %IPC-5-WATERMARK: [dec] messages pending in [chars] for the port [chars]([hex].[hex]) seat [hex]

Several IPC messages are waiting to be processed. If the number increases, this condition may result in the exhaustion of IPC header cache or buffers.

Recommended Action: Copy the message exactly as it appears on the console or in the system log. Enter the show tech-support ipc command to gather data that may help identify the nature of the error. Research and attempt to resolve the issue using the tools and utilities provided at With some messages, these tools and utilities will supply clarifying information. Search for resolved software issues using the Bug Toolkit at If you still require assistance, open a case with the Technical Assistance Center via the Internet at, or contact your Cisco technical support representative and provide the representative with the information you have gathered. Attach the following information to your case in nonzipped, plain-text (.txt) format: the output of the show logging and show tech-support ipc commands and your pertinent troubleshooting logs.

It suggests to use

sh tech-support ipc

to get more information

Hope to help


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