[c-nsp] spanning trees failing on five minute intervals

[Suchy Daniel]

I experienced similar problem with Cisco boxes having set absolute 
port-security aging timers on affected ports (specially visible on lines 
used for TDMoIP, which are more sensitive for packet-loss). Change to 
inactivity timers for portsecurity solved that problem [but on 65xx 
platform this feature is available only for Sup720, at least on CatOS]...

> We have an otherwise healthy network that is dropping
> packets on precise five minute intervals.  The problem
> originally came to our attention when we started
> seeing SYNs dropping from one of our applications, but
> we can also reproduce it with traceroute.  We narrowed
> down the problem to where we see our 6500 get a
> packet, but it does not deliver it to the neighboring
> switch.
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