Re: [mpls-tp] PSC MEP action on Non TTL 1 value- Receive

Hi,

If I understand it correctly, the thread below assumes
draft-ietf-mpls-tp-linear-protection-04 applies to PW protection as
well. However the draft explicitly limits its scope to LSPs,
specifically:

"The protocol addresses the protection of LSPs in an MPLS-TP network as
required by [RFC5654 <http://tools.ietf.org/html/rfc5654> ] (in
particular requirements 63-67 and 74-79) and described in [SurvivFwk
<http://tools.ietf.org/html/draft-ietf-mpls-tp-linear-protection-04#ref-
SurvivFwk> ]", and
"The applicability of this protocol to additional MPLS-TP constructs and
topologies may be documented in future documents."

Is there a hidden assumption that the scope of the draft will be
extended to cover PW protection? Or is there something I'm
misunderstanding here?

Thanks,

Daniel

From: mpls-tp-bounces@ietf.org [mailto:mpls-tp-bounces@ietf.org] On
Behalf Of Greg Mirsky
Sent: Thursday, March 17, 2011 3:00 AM
To: Saravanan P
Cc: mpls-tp@ietf.org
Subject: Re: [mpls-tp] PSC MEP action on Non TTL 1 value- Receive

Dear Saravanan,

VCCV Control Channels 2 and 3 cannot be used to carry PSC OAM as it uses
ACh/G-ACh. (I think that only BFD, LSP and ICMP ping might use CC 2 and
3). As I understand the draft-ietf-mpls-tp-linear-protection-04.txt, the
PW must use PW CW in order to properly process PSC signalling. Of
course, that is the case for MPLS-TP PW and based on current wording of
RFC 5586. If GAL is used in PWs, in non-TP and/or MPLS TP PSN, use of PW
CW might not be required.

Regards,

Greg

On Tue, Mar 15, 2011 at 3:05 AM, Saravanan P <PSaravanan@ixiacom.com>
wrote:

Hi,

In spec  Linear Protection draft-ietf-mpls-tp-linear-protection-04.txt,
what will be the default behavior if designated MEP receives the PSC OAM
packet with  Pseudowire lable has non TTL 1 value ?

How does MEP in PE knows that should pass the packet to control plane or
forward the packet since PW label is non TTL 1 value.

PE should take decision by seeing Tunnel and PW  label or TTL also need
to be looked ?
Regards,
Saravanan.
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