On 1/16/14, 9:35 AM, Stewart Bryant wrote: >> Look at it the other way: if transport area folks would want to >> send MPLS packets into the network in some problematic way, I'm >> sure the routing and ops folks would not be amused. > The root cause of the problem here is that UDP, has bifurcated into a > general purpose encapsulation. One observation with respect to general purpose use of UDP as an mpls encapsulation on the internet as a whole that seems to have been missed in this discussion is the rather dire prospects for MTU and potential for fragmentation. Effectively, assuring, that you do not need to fragment requires as certain amount of coordination. 1500 mtu hops pretty effectively (imho) preclude the use of this encapsulation on the internet as a whole (if encapsulated traffic is not aware of a correspondingly lower MTU) this is especially true for L2vpn where you don't have recourse to PMTUD). As the document notes (section 4) preventing fragmentation is rather important. > Stewart >
Attachment:
signature.asc
Description: OpenPGP digital signature