[c-nsp] Sup720 - FIB full, software switching

"Rolf Hanßen" nsp at rhanssen.de
Mon Feb 3 09:09:07 EST 2014


today I saw 2x Sup720-3B (default 192K IPv4 routes) that received a full
After FIB was filled IOS gave a warning that it now may forward in
software (and resetted all BGP sessions because of memory issues). I don't
have the exact messages.

The real problem occured after that. I shut the full table BGP session and
cleared the others, the system now had a few routes only again.

But it started to drop packets, I saw no pattern, it looked nearly random.
I needed to reboot both boxes to resolve that issue.

IOS was s72033-advipservicesk9_wan-mz.122-33.SXJ.bin

Is there a way to avoid those issues by let it just ignoring routes not
matching into the FIB?
Is there a command to reset the routing mode/routes back to CEF without
reloading the box?

kind regards

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