[c-nsp] 7200 vs. 7600

[F. David Sinn]

What Supervisor are you looking to use in your 7600?  That will 
determine some of the answers to your questions below.

The only one that is consistent is the re-use of dot1q tags.  Since the 
7600 is a ethernet switch at heart, using the same tag on two 
interfaces puts them on the same broadcast domain.  Also, I don't 
believe that they have implement the physical sub-interface style of 
configuration for dot1q as the regular routers do, so you would have to 
migrate to VLAN interfaces to support dot1q (please correct me if this 
has been fixed).

David

On Oct 3, 2004, at 1:49 AM, Ryan O'Connell wrote:

> 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
>
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