RE: Two Drafts for Resilience of Control Plane

["Drake, John E" <John.E.Drake2@boeing.com>]

> 
> [JD]
> IB>> This would require node D, for example, to know exactly what to
do
> with
> the service when it gets notified about the CP failure.
> Policies do not work here. It's totally upto user to decide what to do
> with
> this service.
[JD] 

I don't buy that.  That's what Service Level Agreements are for.

> The only way it can convey this decision is by sending more
> requests to the LSP ingress controller. For instance, the user may
decide
> to
> keep using the service for a while and then delete or reroute it
before
> the
> controller B comes back.
[JD] 

Why would the user be involved any decision other than hanging up?  The
user shouldn't be aware that node B failed.  You are asserting a
particular mode of operation for a service provider network which seems
to require that every instance of every service have its own
individualized recovery plan.

> Neither of your options below therefore works. See also my response to
> Dimitri.
> 
> Igor
> 
> 
> Due to 'CP degraded' notification, nodes C and D will know that B
> failed.
> 
> In option a), local policy, configured via the NMS, at D will tell it
> whether to send a PathErr with state removed and if so, how long to
> wait.  As stated in another e-mail, multiple CP failures are handled
by
> configuration, via the NMS, at intermediate nodes that tell them under
> what circumstances and after what duration to send PathTear and /or
> PathErr with state removed, or whether simply to wait until the
> resources time-out and how long to wait before timing them out.
> 
> In option b) A creates an MBB LSP on the path A, E, F, H, K, D.
> Subsequently, A sends a PathTear to B, and D sends a PathErr with
state
> removed to C.  The MBB LSP was created under policy control, via the
> NMS, at the ingress node, A.
> 
> Here's your initial example:
> 
> A----B------C-----D
> |                 |
> E-----F-----H-----K
> 
> > I have a solution and am planning to write a draft. I'd like this
work
> to
> > live in CCAMP.
> [JD]
> 
> You can't get pre-approval of an I-D.
> 
> >
> > Igor