Re: [mpls] Last Call: <draft-ietf-mpls-in-udp-04.txt> (Encapsulating MPLS in UDP) to Proposed Standard

[Joe Touch <[e-mail]>]

On 1/16/2014 2:32 PM, Ross Callon wrote:
>>> These tunnels are stateless
>>
>> yep. (But they don't have to be.)
>
> The tunnels strictly speaking do not have to be stateless. However, if you want routers to actually implement them, and you want to scale in both forwarding speed and number of tunnels, then yes they do have to be stateless.

There's clearly a problem though:

	- tunnels must be stateless to be efficiently implemented

	- transport layer tunnels must have congestion control

Saying that the only way we can make tunnels cheap is to make them break 
the Internet isn't a good solution.

Maybe it's time to expect something that's inherently costly to end up 
being expensive?

Joe