[Pce] 答复: Re: I-D Action:draft-bao-pce-pre-configured-routing-00.txt

[Bao.Yuanlin at zte.com.cn]

Hi Adrian, 

Thanks for your comments.

The main idea of this draft is to solve
the problem of potential unavailability 
of pre-configured routes and to provide
better service, which is described in 
section 2.

For the first question, I'm sorry for
the mistake, and this will be rectified
in the next version.

For the second question, the flag defined
in the draft is to let PCE know PCC need
pre-configured route service. And PCC
doesn't care how the route was derived. 
PCC can update the stored pre-configured
route when it receives a PCRep message with
the flag set. For PCE, when it receives
a PCReq message with flag set, it can
recognize a pre-configured route service
is requested from PCC. So PCE can compute
and send the updated pre-configured
route to PCC when the corresponding condition 
meets.


Best regards,
Yuanlin Bao



"Adrian Farrel" <adrian at olddog.co.uk>
写于 2009-10-19 19:29:11:

> While this is a reasonably well-written draft, I don't see that it
adds 
> anything to what we already have in the core RFCs.
> 
> In section 4.3 you have...
> 
>    There are two options
>    for PCE to send pre-configured route as follows:
>    PCRep is used to respond route computation result naturally.
 If it
>    is used to send pre-configured route, a new flag SHOULD
be defined to
>    indicate the route carried is pre-configured route.
> 
> Two questions:
> 1. What is the other option? You only list one option.
> 2. Why do you need a flag to indicate that a route is pre-
>    configured? Why does the PCC care how the route was
>    derived?
> 
> You slighlty answer question 2, in section 5.1 where you say...
> 
>    When PCC requests pre-configured route
> 
> ...but why would the PCC ask for a pre-configured route? It just wants
a 
> route. If there is a policy to be applied by the PCE in selection
of the 
> route, this should be indicated using the normal policy functions.
If there 
> is an objective function/algorithm to be applied in selecting the
route, 
> this should be indicated using the OF object.
> 
> So I think that you don't need the pre-configured route flag.
> 
> Cheers,
> Adrian 
> 
>