Subject: RE: Query on LMP document?

From: Jonathan Lang <[email-masked]>
Date: Fri, 1 Sep 2000 11:59:52 -0700

Sudhanshu,
  Sorry for the delay in response, I have been out of town.  Comments
in-line.

-Jonathan

>-----Original Message-----
>From: Sudhanshu Jain [mailto:[email-masked]]
>Sent: Tuesday, August 29, 2000 4:58 PM
>To: [email-masked]
>Cc: [email-masked]
>Subject: Query on LMP document?
>
>
>Hi All,
>
>I have following query on draft-lang-mpls-lmp.
> 
>1) If both control channel(s) (primary as well as backup) are not
available, link goes
> into DEG state. In DEG state, how does the data channel LSP (e.g RSVP
refresh) are going
> to be maintained? 
Soft state cannot be maintaned indefinately when a communication fails,
however, if the refresh timer is sufficiently large, the problem may be
addressed before a refresh is needed.

> 
>2) As per the draft, for verification of the link, data (test message) is
need to be read 
>over the optical component link. Why do we need this kind of capability?
This is required to verify the physical connectivity of the component link.
The reason a test message is used (as opposed to just pulses of light, for
example) is that there may be opaque (terminating) devices between the boxes
running LMP which would not pass such pulses.

> 
>Is information gathered from power measurement and Optical Spectrum
Analyzer (OSA) is not 
>sufficient to declare link connectivity?
see above.  Such light may not be passed through to the adjacent box if an
opaque device is between boxes.

> 
>Is the Link verification capability in LMP is optional?
no

>-Sudhanshu