[c-nsp] MPLS MTU / Jumbo frames etc.

[Justin Shore]

Brandon Applegate wrote:
> I think I figured (part of) this out.  Packets to the router != packets 
> through the router.  Trying to ping something on the far side with 
> packet size of 9188/9216 gets me the expected icmp frag @ 9212.  I still 
> think I'm going to proclaim that jumbo == 9000 to make it easier for 
> server / storage guys to remember anyway :)

I used to use 9216 across my network until I ran into some devices that 
couldn't do 9216.  I forget what they were but I ended up lowering it 
all to 9000 after that.  I don't expect to ever send frames that large 
anyhow but I wanted to lay the groundwork for it early.

Justin