[j-nsp] mx960 to mx960 via ciena 6500 - mtu smaller in the middle

[Chuck Anderson]

It depends if the DWDM gear is purely L1 or if it is doing OTN switching (it will be doing OTN if you are mapping 1 or more lower rate client side signals into 1 or more higher rate line side signals).  The latter deals with framing and would have MTU limits.  The former would have a 1:1 mapping from each client side wave to a each line side wave.

On Tue, Apr 17, 2018 at 07:24:41AM -0500, Aaron Gould wrote:
> This issue is my turning up new MX960's that are simply connected together with Ciena 6500 DWDM.... for me to have an MTU issue via DWDM is actually a surprise to me.  I pretty much always envisioned wave/lamda dwdm as darn near like having an actual fiber cable... no, not the case apparently... I'm surprised that the ciena dwdm service in this case is actually imposing an Ethernet mtu limitation !  wow, the more I think on it, the more I'm surprised about it... previously my older asr9k 15-node mpls ring was via fujitsu flashwave dwdm and I don't recall this occurring