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RE: [mpls] misdelivered mpls packets - Was: Re: draft-ietf-mpls-in-udp was RE: gre-in-udp draft

2014-01-10 10:59:25
Hi Loa, et al.,
I think that you're referring to Connectivity Verification in MPLS-TP (RFC 
6428). It would only detect mis-connection but would not count leaked in frames.

Such problem may be more apparent in Segment Routing (SPRING WG). Perhaps CV 
should be a requirement in SR OAM.

        Regards,
                Greg

-----Original Message-----
From: mpls [mailto:mpls-bounces(_at_)ietf(_dot_)org] On Behalf Of Loa Andersson
Sent: Thursday, January 09, 2014 8:17 AM
To: mark(_dot_)tinka(_at_)seacom(_dot_)mu; stbryant(_at_)cisco(_dot_)com
Cc: gorry(_at_)erg(_dot_)abdn(_dot_)ac(_dot_)uk; mpls(_at_)ietf(_dot_)org; 
ietf(_at_)ietf(_dot_)org; david(_dot_)black(_at_)emc(_dot_)com; 
tsvwg(_at_)ietf(_dot_)org; jnc(_at_)mit(_dot_)edu; lisp(_at_)ietf(_dot_)org
Subject: [mpls] misdelivered mpls packets - Was: Re: draft-ietf-mpls-in-udp was 
RE: gre-in-udp draft

Changed the subject line !

On 2014-01-09 20:36, Mark Tinka wrote:
On Thursday, January 09, 2014 02:08:43 PM Stewart Bryant
wrote:

Either or both.

I can only speak to native MPLS, as I've never run tunneled MPLS.

I am interested in how often in practice MPLS packets get 
misdelivered due to label corruption.

Well, first of all, routers would need to report corrupted MPLS frames 
so operators can glean this data. This isn't something I've come 
across, but it would be good to find some kind of way to count this 
across interfaces, if the routers can detect and report them.

This would be possible to do with MPLS-TP OAM, wouldn't it?

/Loa

The known issue about mis-delivery of MPLS frames is poorly- sized MTU 
interfaces. I have no empirical data as to how this can corrupt 
successive MPLS frames that may fit into the transit MTU. But in this 
case, as with any Layer 2 traffic, not enough MTU = dropped frame.

Mark.


-- 


Loa Andersson                        email: 
loa(_at_)mail01(_dot_)huawei(_dot_)com
Senior MPLS Expert                          loa(_at_)pi(_dot_)nu
Huawei Technologies (consultant)     phone: +46 739 81 21 64
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