[rbridge] FTag

[Joe Touch]

Caitlin Bestler wrote:...
> Despite the description, this is ultimately a Class of Service
> field. Class of Service fields are always useful, the question
> is whether they are useful enough. Each extra bit is less useful,
> and potentially costs a lot more.
> 
> To justify increasing the shim header size I think a scenario
> that would specifically require the extra classes would be
> useful -- or at least one that exhausts those available without
> the extra field.
> 
> Philosophically, I take the attitude that the bandwidth belongs
> to the customer. I want a justification for each and every bit
> I take out of it (although realistically I know that they come
> in handy 32-bit packages).

And it's nice to have room for expansion, i.e., unused bits.

IMO, we're either trying to support routed ethernet or routed IP; if the
former, there's no point in anything other than the TTL field beyond the
destination address. If the latter, then let's put in a full IPv6 header
- with options and run IP on the nodes - i.e., just use IP.

Joe

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