IOS upgrade,MEM util

[rmv72]

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

[paolo bevilacqua]

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

[rmv72]

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

which level is critical?

[Ivan Shirshin · Accepted solution]

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

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[rmv72]

Ivan, thank you for very informative answer!

[Ivan Shirshin]

Welcome, Mike!

[paolo bevilacqua]

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