[nsp] Cisco 7600 and uRPF

[Andrew Fort]

On 3/03/2004 3:38 AM, Jared Mauch wrote:

>	the box will only do one 'global' u-rpf mode on the sup2.
>the sup1 it's done in software only, not in hw.
>
>	i can't recall if they "fixed" this in the 720.  i can go
>check my notes in a few ..
>
>	- jared
>	
>  
>

Correct, it's basically the same on sup720 - you can pick only a single 
mode (strict, loose, multi-interface 'strict') for the whole box on 
Sup720, and on/off per interface as expected.  The new Sup720 specific 
Multi-interface strict mode is where you can say "I want the URPF strict 
check to be performed looking at this group of interfaces", rather than 
a single interface only.  This is quite a useful compromise between the 
two modes on an aggregation router (given suitable network 
architecture), I feel, by grouping your customer and internodal (but not 
core) facing interfaces, to allow multi-homed situations (across 
multiple routers) to be URPF'd.

-afort