RE: [PWE3] Is VCCV LSP Ping to test only MPLS PWs over MPLS PSN ?

Tom, Raman and all,
My understanding of the original question was (please correct me if I
got something wrong):

	Can LSP ping in VCCV be used to verify the PW connectivity if it
uses, say, MPLS-in-IP or MPLS-in-GRE for transport and the PW label
(bound to the appropriate PW Id or Generalized PW Id FEC) for PW
demultiplexing? And is such a verification required if the IP
connectivity to the remote device is OK?

IMHO the answer is:

*	
	Such a verification makes sense (the PW demuxing in the remote
box can go wrong even if the IP transport brings the PW packets to the
correct remote box)
*	
	LSP Ping in VCCV is the appropriate (and, AFAIK, the only) way
to perform it.

Did I miss something?

Regards,
                   Sasha

________________________________

From: Thomas Nadeau [mailto:tnadeau@lucidvision.com] 
Sent: Tuesday, November 27, 2007 4:26 PM
To: Raman Rangaswamy
Cc: pwe3@ietf.org; Vijayanand C - TLS, Chennai.
Subject: Re: [PWE3] Is VCCV LSP Ping to test only MPLS PWs over MPLS PSN
?

	Hi ,

	Can I conclude from the below draft sections that
	"LSP Ping should be used to test MPLS PWs over MPLS PSN and
	it does not applicable to test MPLS PWs over IP PSN(Say GRE
tunnel)."

VCCV should always be used to test the PW layer regardless of the PW 
type or encapsulation, and the appropriate tools for the lower layer to
test those. 
So use LSP ping/trace for MPLS LSPs, and ICMP echo for IP/l2tp 
tunnels/paths.

--Tom

	Draft: draft-ietf-pwe3-vccv-15
	Section 3 : The CV types include LSP Ping [RFC4379] for MPLS
	PWs, and ICMP Ping [RFC0792] [RFC4443] for both MPLS and L2TPv3
PWs. 

	Section 4: The various VCCV CV types supported are used only
when they apply to the
	context of the PW demultiplexer in use.  For example, LSP Ping
type should only be used 
	when MPLS is utilized as the PSN.

	Thanks,
	Raman R
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