[j-nsp] L2VPN MTU Issue

[Eric Van Tol]

> -----Original Message-----
> From: Dermot Williams [mailto:Dermot.Williams at imaginegroup.ie]
> Sent: Wednesday, September 29, 2010 10:43 AM
> To: Eric Van Tol; juniper-nsp
> Subject: RE: [j-nsp] L2VPN MTU Issue
> 
> Hi Eric,
> 
> Unless it's sensitive, would you mind sharing how you arrived at that
> number please?
> 
> Thanks,
> 
> Dermot

Well, primary credit goes to JTAC, but doing some packet captures, I found that the packets entering the customer interface were not leaving the router.  JTAC suggested 1520, but that only allowed 1498-bytes through.  I bumped it up to 1524, which still did not work, so then I bumped it up to 1528.  I am still not too keen on the math, but JTAC hasn't broken it down for me yet.  If anyone out there knows, please point me to a reference.  I googled like mad yesterday, but either overlooked the obvious, or wasn't searching for the right info.

-evt