Subject: [mpls-tp] R: operator commands and survivability in draft-Weingarten-mpls-tp-ring-protection

From: D'Alessandro Alessandro Gerardo <[email-masked]>
Date: Fri, 9 Apr 2010 12:23:53 +0200

I renew my request to the authors and to the IETF community about some doubts I have about  the draft "draft-Weingarten-mpls-tp-ring-protection" :

 1.  can operators count on "Operator commands" like FS (forced switch), MS (manual switch), LP(lockout of protection) for  both Wrapping and steering approaches?
 2.  does the proposed wrapping solution assure survivability in case of multiple arbitrary failures on a ring (e.g. survivability when any to any traffic relationships exist on the ring)?
 3.  I guess it is possible to enhance the solution (respect to that one described in the draft that protect from a single link or single node failure) to face with multiple adjacent failures in a ring (e.g. two adjacent nodes). With that hypothesis in mind, has the wrapping approach a level of complexity that does not impact on the node scalability?
 4.  focusing on the wrapping solution in the case of node failure, does the protection configuration require configuring which flows must be tunnelled towards the secondary node PST or it is not required?

Thanks in advance.
Best regards,
Alessandro

________________________________
Da: [email-masked] [mailto:[email-masked]] Per conto di D'Alessandro Alessandro Gerardo
Inviato: mercoledì 24 marzo 2010 22.13
A: [email-masked]
Oggetto: [mpls-tp] operator commands and survivability in draft-Weingarten-mpls-tp-ring-protection

I would ask some clarifications about the different ring protection mechanisms proposed in "draft-Weingarten-mpls-tp-ring-protection".

 1.  can operators count on "Operator commands" like FS (forced switch), MS (manual switch), LP(lockout of protection) for  both Wrapping and steering approaches?
 2.  do the proposed solutions assure survivability in case of multiple arbitrary failures on a ring (e.g. survivability when any to any traffic relationships exist on the ring)?
 3.  I guess it is possible to enhance the solution (respect to that one described in the draft that protect from a single link or single node failure) to face with multiple adjacent failures in a ring (e.g. two adjacent nodes). With that hypothesis in mind, has the wrapping approach a level of complexity that does not impact on the node scalability?

Thanks in advance.
Best regards,
Alessandro

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Questo messaggio e i suoi allegati sono indirizzati esclusivamente alle persone indicate. La diffusione, copia o qualsiasi altra azione derivante dalla conoscenza di queste informazioni sono rigorosamente vietate. Qualora abbiate ricevuto questo documento per errore siete cortesemente pregati di darne immediata comunicazione al mittente e di provvedere alla sua distruzione, Grazie.

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