[c-nsp] MPLS and links with limited MTU size

Adam Vitkovsky Adam.Vitkovsky at gamma.co.uk
Mon Jan 25 04:23:18 EST 2016

> Saku Ytti
> Sent: Sunday, January 24, 2016 8:05 PM
> To: Alexandre Snarskii
> Cc: cisco-nsp at puck.nether.net
> Subject: Re: [c-nsp] MPLS and links with limited MTU size
> On 24 January 2016 at 16:35, Alexandre Snarskii <snar at snar.spb.ru> wrote:
> > Not sure if it can be done with Cisco, with Juniper MX it's possible
> > since JunOS 14.2.
> MX Trio has very good fragmentation rate, it's done in the NPU (there is per-
> flow limit which is no where near wirerate). But for example ASR9k will
> fragment on LC CPU, so you really don't want to fragment on ASR9k.
Interesting I didn't know that, do you know if LU or MQ is responsible for the fragmentation? But I'm afraid it would overload the Trio ensemble pretty quickly.
Yeah, on ASR9K the "to be fragmented" traffic has to be punted to LC CPU and that is subject to LPTS rate-limiting.


        Adam Vitkovsky
        IP Engineer

T:      0333 006 5936
E:      Adam.Vitkovsky at gamma.co.uk
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