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RE: [PWE3] PWE3 state information in context to ATM
Anindya,
See draft-nadeau-pwe3-oam-msg-map-04.txt
Section 6 covers the mapping of PW failures and alarms to ATM alarms and vice versa. Section 4.7 discusses some issues regarding the bi-directional nature of Pseudo Wires.
One point that is not clearly covered in the current draft and that was pointed out by Neil Harrison is that even if only one direction of a PW is down, from a perspective of SLAs and Performance Monitoring the entire emulated ATM VC must be considered failed.
Peter
> -----Original Message-----
> From: Roy, Anindya (Anindya) [mailto:anroy@lucent.com]
> Sent: Monday, March 22, 2004 10:12 AM
> To: Roy, Anindya (Anindya); 'pwe3@ietf.org'
> Subject: [PWE3] PWE3 state information in context to ATM
>
>
>
> Hi All,
>
> Would like to get the groups view on the following issue.
>
> PWs can fail in a single direction or in both
> directions.However this may not be acceptable when the PWE3
> are used to emulate ATM Layer2 connections, to maintain the
> integrity of the bidirectional property of ATM connections.
>
> My understanding is in order to preserve the integrity of the
> BI-DIRECTIONAL property of ATM VC/VP, any or both of the
> following MUSTBE supported.
>
> (1) If a PWE3 is emulating a ATM Layer 2 service, the PW must
> be bound to a *bi-directional* PSN tunnel because of the
> ATM's bidirectional connection properties ?
>
> (2) Incase the PW is allowed to setup over two disjoint
> unidirectional tunnels in each direction, then the
> implementation must maintain state information of both the
> tunnels in order to synchronize the operational state of the
> ATM VC's in both the direction to handle situations of PSN
> failures in single direction.
>
>
> If there is already a proposed solution can someone please
> provide a pointer.
>
> Thanks.
> Anindya
>
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