Re: Control plane resiliency

["Igor Bryskin" <ibryskin@movaz.com>]

Diego,

I would like to read the paper you mentioned.

Igor

----- Original Message ----- 
From: "Diego Caviglia" <Diego.Caviglia@marconi.com>
To: "Adrian Farrel" <adrian@olddog.co.uk>
Cc: "<ccamp" <ccamp@ops.ietf.org>
Sent: Wednesday, November 02, 2005 8:27 AM
Subject: Re: Control plane resiliency


>
> Hi all,
>               a quick comment in line.
>
> Regards
>
> Diego
>
>
>
> "Adrian Farrel" <adrian@olddog.co.uk>@ops.ietf.org on 31/10/2005 23.37.34
>
> Please respond to "Adrian Farrel" <adrian@olddog.co.uk>
>
> Sent by:    owner-ccamp@ops.ietf.org
>
>
> To:    <ccamp@ops.ietf.org>
> cc:
>
> Subject:    Control plane resiliency
>
> [CUT]
>
> 4. *The* controller resiliency issue appears to be: How to manage and
> teardown an LSP downstream of a broken controller. I do not understand why
> the answer is not one of:
> a. Wait for the controller to be repaired
> b. Use the management plane
> It seems that in-place modification of GMPLS LSPs is not a common
> operational feature for an active LSP. This leaves us with teardown. For
> teardown, option a does not seem to be very painful, but if it does cause
> problems (and alarms *will* be raised) option b is available.
> [dc] In last DRCN (http://drcn2005.telecomitalialab.com/) ww presented a
> paper that illustrates a possible solution of this issues.
> It works using signalling messages.
> If someone is interesed in reading the paper please write me and I'll send
> the paper.
>
>
> [CUT]
>
> 8. In a transport network, we must accept an operator's right to entirely
> eliminate soft state timeouts. That is, the failure of the control plane
> for any length of time, must not impact the traffic (note that even though
> RSVP is a soft state protocol, the refresh period may be set so high (32
> bitsworth of milliseconds) as to be practically infinite. Note
> specifically that the failure of Hellos is used in RFC3473 to temporarily
> "turn off" the soft state nature of RSVP-TE.
> [dc] I strongly agree with this.
>
> [CUT]
>
> Thanks,
> Adrian
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