Re: [mpls-tp] Alarm Reporting (aka AIS)

[Alexander Vainshtein <[e-mail]>]

Maarten,
Could you please point to specific statements in the already published, or approved for publication MPLS-TP standards that confirm this statement?

Until now, I have been under the impression (possibly, a wrong one) that setting up MEPs at the end point of the transport entities is at the discretion of the operator.  And, at the very least, that nothing prevents the operator from disabling these MEPs.

BTW, this is one more example of the differences between the SONET/SDH-based traffic networks (where the OAM headers are inherently generated and terminated for each transport entity) and packet-based networks where OAM uses dedicated packets which would not be transmitted until somebody explicitly injects them into the traffic path, and can be silently discarded upon reception if you decided to do that.

Regards,
     Sasha

From: [e-mail] [mailto:[e-mail]] On Behalf Of Maarten Vissers
Sent: Wednesday, December 08, 2010 9:17 AM
To: 'Sprecher, Nurit (NSN - IL/Hod HaSharon)'; [e-mail]
Cc: 'Zhao, Peng (NSN - CN/Shanghai)'
Subject: Re: [mpls-tp] Alarm Reporting (aka AIS)

Nurit,

In MPLS-TP all transport paths are monitored and will have MEPs.

Regards,
Maarten

From: [e-mail] [mailto:[e-mail]] On Behalf Of Sprecher, Nurit (NSN - IL/Hod HaSharon)
Sent: 8 December 2010 03:06
To: [e-mail]
Cc: Zhao, Peng (NSN - CN/Shanghai)
Subject: [mpls-tp] Alarm Reporting (aka AIS)

Hi,
I have a question about the functionality of Alarm Reporting....
Assuming that there is a failure at a server layer somewhere across the network....and the MEP of the server layer identifies it and needs to ensure that Alarm Reporting is sent to all of the MEPs of the client services that transmit over the failed server...but it may be that some of the client services do not have MEPs....how does the node detecting the server failure knows which client services have MEPs and an Alarm Reporting message needs to be sent to their MEPs and which do not have MEPs and an Alarm Reporting message must not be sent for these client services....(as we would not like to flood the network with unnecessary traffic)....
I hope someone can clarify it to me.
Best regards,
Nurit