[c-nsp] 7200 vs. 7600

[Ryan O'Connell]

Looking at the second hand cost of 6500/7600 parts vs. 7200s, they're 
very well priced so I'm considering 7600s instead of upgraded/additional 
7200s with NPE-G1s for a forthcoming network upgrade.

However, I'm aware there are some things a 7600 can't do that a 7200 
with trunks to a lot of attached switches can. The ones I'm aware of are:
- It appears you can't (usefully) do anything ADSL/L2TP related on the 
7600. (Which means you can't terminate an ATM circuit from a provider on 
it and use it as an L2TP Tunnel Switch, nor can you terminate L2TP 
circuits on it)
- You can't use the same dot1q encapsulation on two seperate interfaces, 
even if they're configured as Layer 3 interfaces.
- I presume the same restrictions on ACLs apply as when using 6500s with 
MFSCs in Hybrid mode. (I.e. src/dst port/ip can be hardware-switched, if 
you put anything more complex in there it's going to be process-switched 
and kill the CPU)

Is everything else possible? Features I'm using excluding ADSL at the 
moment are pretty basic ISP ones - BGP, OSPF, SPAN, ip verify unicast 
reverse-path, ACLs, BPDU filter, (Which I guess I won't need on 7600) 
Leased Line aggregation, (PA-MC-STM-1MM, but that could stay on a 7200) 
Netflow and some fairly basic rate-limiting on some (troublesome) 
customers ports. I'll probably also need Multicast soon and IPv6 "sometime".

-- 
         Ryan O'Connell - CCIE #8174
<ryan at complicity.co.uk> - http://www.complicity.co.uk

I'm not losing my mind, no I'm not changing my lines,
I'm just learning new things with the passage of time