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Webcast-Catalyst9k
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High Router CPU

Hi,

I have a router that telnet sessions were running slow on. I checked sho proc cpu and TTY Background was using 46%. I checked sho proc cpu his and the router had been running like this for at least 72 hours.

What is TTY background and why would it be using so much CPU

The router in question is a 2611 64mb ram 48mb fl running FW IOS c2600-io3.122-15.t2.bin

2 REPLIES
Silver

Re: High Router CPU

If yopu have logging synchronous enabled you could be hitting this bug

CSCdy01705

Release Notes

A Cisco router may experience high cpu utilization at process

TTY Background when the command logging synchronous

is configured under line con 0.

The workaround is to remove the command logging synchronous

from line con 0, however, this should only be performed during a scheduled

maintenance window as the router could pause indefinitely just after removal

of the command, possibly requiring a manual reboot of the router.

Silver

Re: High Router CPU

here is another bug

CSCds73259

A Cisco 2610 router that is running Cisco IOS Release 12.1(4) may experience

performance degradation from high CPU utilization caused by a defective modem

signal. There is no workaround.

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