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

Don Nightingale dnightin at wellesley.edu
Mon Feb 3 11:21:29 EST 2014

There is a field upgrade available from Cisco for the 3B to convert it 
to a 3BXL that as I recall was fairly cheap, and was pretty simple to 


On 2/3/2014 9:09 AM, "Rolf Hanßen" wrote:
> Hi,
> today I saw 2x Sup720-3B (default 192K IPv4 routes) that received a full
> table.
> 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
> Rolf
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