[c-nsp] Cisco ASR 9K Vs 7600

[Nick Hilliard]

> ASR9K gives good NetFlow, 7600 doesn't.

mostly - it's getting there (e.g. doesn't support destination based netflow 
for ipv4, or either peer-as or destination AS records for v6)  But it 
doesn't have the awful limitations of the sup720 in this regard.

> ASR9K doesn't have weird ACL-construction caveats, 7600 does.
>
> ASR9K support uRPF mode on a per-interface basis, 7600 doesn't.

Unlike EARL7 kit, it supports ipv6 urpf in hardware.  Loose ipv6 urpf isn't 
there just yet, but it's on the roadmap.

It also runs XR.  And despite having an upgrade process which was designed 
by someone who obviously never, EVER had a requirement to upgrade a live 
production router, XR is really much nicer than IOS.

Nick