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

Saku Ytti saku at ytti.fi
Sun Jan 24 15:05:15 EST 2016

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
It seems likely that in few years time we won't see any NPU which can
fragment, since if the market accepts boxes which fragment on CPU,
there is little incentive to implement the complexity in NPU.


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