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New Member

IOS upgrade,MEM util

Hello,

after IOS upgrade to 15.x on Cisco2811 MEM util rised from 20% to 43%. Is it critical?

Which level of MEM utilization is critical?

Regards,

Mike

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Cisco Employee

IOS upgrade,MEM util

Hi Mike,

The router will have failures in forwarding/services if it does not have enough memory to allocate for corresponding processes. So as long as there is free memory, the services should not be impacted. Thus critical condition is when memory is in 9x% - e.g. 98% memory is utilized and only 2% free. With so little free memory network churn or new routes added the router may have issues.

I would recommend to start investigating memory utilization if it goes above 80%. E.g. monitor if free memory amount is decreasing day by day, as it could be a sign of a memory leak. I don't think there are Cisco recommended thresholds though.

43% is all right and not critical at all.

Kind Regards,
Ivan

**Please grade this post if you find it useful.

Kind Regards, Ivan Shirshin **Please grade this post if you find it useful.
6 REPLIES
Hall of Fame Super Gold

IOS upgrade,MEM util

Not critical. To be safe, have 512 MB or more on ISR router.

New Member

IOS upgrade,MEM util

Yeah, i know that 512M will be safe but... $)

which level is critical?

Cisco Employee

IOS upgrade,MEM util

Hi Mike,

The router will have failures in forwarding/services if it does not have enough memory to allocate for corresponding processes. So as long as there is free memory, the services should not be impacted. Thus critical condition is when memory is in 9x% - e.g. 98% memory is utilized and only 2% free. With so little free memory network churn or new routes added the router may have issues.

I would recommend to start investigating memory utilization if it goes above 80%. E.g. monitor if free memory amount is decreasing day by day, as it could be a sign of a memory leak. I don't think there are Cisco recommended thresholds though.

43% is all right and not critical at all.

Kind Regards,
Ivan

**Please grade this post if you find it useful.

Kind Regards, Ivan Shirshin **Please grade this post if you find it useful.
New Member

IOS upgrade,MEM util

Ivan, thank you for very informative answer!

Cisco Employee

IOS upgrade,MEM util

Welcome, Mike!

Kind Regards, Ivan Shirshin **Please grade this post if you find it useful.
Hall of Fame Super Gold

Re: IOS upgrade,MEM util

Third-party memory expansion is about $20,, works perfectly.

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