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Re: [mpls] draft-ietf-mpls-in-udp was RE: gre-in-udp draft (was: RE: [tsvwg] Milestones changed for tsvwg WG)

Mark Tinka <mark.tinka@seacom.mu> Sun, 12 January 2014 12:26 UTC

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Subject: Re: [mpls] draft-ietf-mpls-in-udp was RE: gre-in-udp draft (was: RE: [tsvwg] Milestones changed for tsvwg WG)
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On Sunday, January 12, 2014 04:59:41 AM l.wood@surrey.ac.uk 
wrote:

> The MPLS assumption is that it's protected and checked by
> a strong link CRC like Ethernet, and checked/regenerated
> by stack processing between hops; here, in a path
> context, with zero UDP checksums MPLS has no checking at
> all.

Right, which is probably why routers today can count badly 
checksum'ed Ethernet frames, but don't have the equivalent 
for MPLS.

> I'm sorry, when was MPLS cheap?

Current-generation ASIC's have no problem forwarding MPLS 
frames at wire rate. One could go so far as to say that MPLS 
has allowed vendors to make cheaper line cards also because 
IP FIB's and traffic queues can be scaled down dramatically 
(not that I'd every buy such line cards, but...).

Mark.

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