[c-nsp] VACL capture versus OAL on 6500s

[Phil Mayers]

The release notes state that OAL (Optimised ACL logging) is mutually 
exclusive with VACL capture:

"""OAL and VACL capture are incompatible. Do not configure both features 
on the switch. With OAL configured (see the "Optimized ACL Logging with 
a PFC3" section on page 34-4), use SPAN to capture traffic."""

We currently use SPAN to mirror our default route, for URL logging 
purposes, however we've got an imminent capacity upgrade to dual 10GbE 
so we're looking at a different approach - specifically we are 
considering VACL to limit capture to port 80 only.

However we have OAL enabled, though (currently) no logging ACLs. Anyone 
know if this is a fundamentally unsolvable issue (in which case we may 
abandon OAL) or not?