[nsp] route maps and cpu usage

[Terry Baranski]

> I'm looking to put a simple route map on a few hundred atm
> interfaces to force the next hop.  I'm having a bit of 
> trouble finding if this is process-switched or not in the 
> 12.2T train.  Any pointers to where I could find that info?

Apparently it's CEF-switched by default from 12.0 on if CEF is enabled.
See
http://www.cisco.com/en/US/products/sw/iosswrel/ps1828/products_configur
ation_guide_chapter09186a00800ca590.html#5751

> I'm also wondering what the behaviour is here if the next hop is
> unreachable...

Standard destination-based routing is performed if there's no route to
the next-hop.  If there is a route to the next-hop (i.e., the outbound
interface is up) but the next-hop itself is down, then you're in some
trouble unless you're using 12.3(4)T which allows PBR to use Enhanced
Object Tracking and allows Enhanced Object Tracking to track via SAA,
which basically means ping-based PBR is possible.  See
http://www.cisco.com/en/US/products/sw/iosswrel/ps5207/products_feature_
guide09186a00801d1e95.html

-Terry