Subject: [Capwap] Please describe flow for image transfer to WTP

From: "David T. Perkins" <[email-masked]>
Date: Fri, 7 Apr 2006 17:38:39 -0700 (PDT)

HI,

I'm having a little trouble understanding the image
download operation in the CAPWAP-00 spec. Pat (or anyone
else that understands) would you please provide an
example.

In particular, it appears that either an AC and WTP can
initiate an image transfer. Is this correct, or can
only the AC push an image to a WTP, or can a WTP also
pull an image?

There are two message types - Image Data Request(14),
and Image Data Response(15), which are defined in
sections 8.1 and 8.2 respectively.

The message elements for a request are:
  1) a filename (section 8.1.1) and
  2) image data (section 8.1.2)

A response has no message elements.

Consider an image file named xyz-wtp-foo-ver1.1.9.img
on the AC that is 48000 octets long.

1) what are the operations (and the values of the message
   elements) to transfer this file to the WTP?
2) where does the WTP store the image? (Is it to
   "memory", or can it also be to persistent store,
   such as flash? If there are more than one place
   to store the image (such as 2 banks of flash),
   how is this indicated?)
3) what happens if the WTP can not store the image
   due to say, not enough memory space, not enough
   of some other system resource, a hardware failure
   in storage subsystem. 
4) can two image transfers occur at the same time?
   If so, how are blocks of data from one image
   distingushed from the other image?
5) The control messages are running on DTLS,
   so it seems like the checksum is not needed.
   Would it's use be explained?
6) Is it assumed that the complete image is
   to be transfer before it is to be stored
   in persistent storage (flash)? 
7) When an how would an WTP initiate an image
   transfer from the AC to the WTP? 
8) Can an image be transfered from the WTP to
   an AC? If so, please describe.

Thanks,
/david t. perkins

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