[c-nsp] disabling dCEF per VIP on 7500?

[Hank Nussbacher]

> A few years ago, some of our routers had VIP2-40s w/ only 32MB.  When they
> ran out of DRAM (as soon as BGP got about halfway loaded), you'd get a
> malloc failure in the syslog, but everything stayed up and it was relatively
> benign.  These boxes had a mix of 40s and 50s.  dCEF would stay working on
> the 50s and "sh cef linecard" displayed that the 40s were "disabled".

Exactly what happened to ours as well.  We had to upgrade the linecards
from 128M to 256M in order to fix the problem.  'sho cef linecard' is your
friend.   -Hank

> Am not positive, but when dCEF disables, router then defaults to what, fast
> switching?  Some non-distributed CEF?  The load on the RSP was definitely
> higher.  In fact, when all the 40s were replaced with 50s, there was a nice
> drop in RSP CPU.
>
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