RE: L2 VPN questions

[Shahram Davari <[e-mail]>]

 > 1. What should be the ttl of VC label set to? In
> > draft-martini-l2circuit-encap-mpls-04.txt, it says that the 
> value should be
> > set to 2, but in draft-martini-ethernet-encap-mpls-01.txt, 
> it says that the
> > value should be set to 255.
> 
> It should be 2.
> 

Why it shouldn't be 1? It seems the reason to limit the TTL is
to prevent the packet to be forwarded further than egress PE.
According to: 

http://www.ietf.org/internet-drafts/draft-ietf-mpls-ttl-03.txt

In all tunneling modes, from ingress to egress, the inner label's TTL is
subtracted by 1 only. And based on the following definition:

"oTTL Check: Check if oTTL is greater than 0. If the oTTL Check is 
false, then the packet is not forwarded"

If TTL=2 at the ingress, then TTL=1 at the egress and the packet could still
be forwarded further.

Yours,
-Shahram