[j-nsp] MTU problems over VPLS

[Luca Salvatore]

11.2R5.4 on all MX involved - this was the recommended release up to a few days ago.
Any ideas on the PR number?

Luca


-----Original Message-----
From: david.roy at orange.com [mailto:david.roy at orange.com] 
Sent: Wednesday, 13 February 2013 8:24 AM
To: Luca Salvatore
Cc: juniper-nsp at puck.nether.net
Subject: Re: [j-nsp] MTU problems over VPLS

Which release do you use ? Experienced some mpls mtu issue on trio platform. Known PR... 

Envoyé de mon iPad

Le 12 févr. 2013 à 22:17, "Luca Salvatore" <Luca at ninefold.com> a écrit :

> I have a few sites connected via a VPLS core.  The core devices are all MX 10 routers connected via 10Gb fibre.
> I'm having problems doing file copies (SCP between two Centos VMs).
> 
> The issue is that the file copy never gets anywhere, on the Centos CLI it sits at 0% then says 'stalled'
> To fix this issue I have just set the MTU on the Centos machines to be 1400 - when this is in place the copy works and I get nice speeds.
> 
> I don't believe I should have to modify the MTU though, shouldn't path MTU discovery take care of this?
> 
> For example - I have done some TCPdumps, I can see the sender is sending traffic with the DF bit set, however I don't see any 'ICMP fragmentation needed' coming back from the MX saying the MTU is too big, I assume this should be the case.
> 
> I haven't modified any of the MTU's on the MX, everything is just the default.
> 
> I also have normal layer 3 running over the fibre between the routers and when I use that I don't see any issues, so it must be something to do with VPLS.
> 
> Any thoughts would be greatly appreciated.
> 
> Thanks
> Luca.
> 
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