RE: relationship of ChannelFail and Data Link FSM

[Jonathan Lang <jplang@calient.net>]

George,
  The upstream node should put the data link into the Down state.  The
downstream node remains in the Up/Alloc state since it doesn't know if the
failure is with this particular link or if it is further upstream.  The
reason to remain in up/alloc is that it may see restored traffic over the
link if the failure is repaired upstream.

Thanks,
Jonathan

> -----Original Message-----
> From: George Young [mailto:george.young@edgeflow.com]
> Sent: Friday, September 07, 2001 10:13 AM
> To: ccamp@ops.ietf.org
> Subject: relationship of ChannelFail and Data Link FSM
> 
> 
> Regarding ID draft-ietf-ccamp-lmp-00.txt, I have a question about the
> ChannelFail message and the Data Link FSM. 
> 
> Firstly, my understanding is that when channel monitoring detects a
> failure, an LMP ChannelFail message is sent upstream, relative to the
> direction of transmission. A node which receives this message 
> and knows
> via monitoring that its upstream link is ok has localized the failure.
> 
> My question is does this cause any state change in the Data Link FSM,
> and if so, does it occur only in the node which localizes the failure,
> or all nodes which are aware of the failure. The current FSM does not
> seem to address this.
> 
> Regards,
> George.
> edgeflow Inc.
> 329 March Rd., Kanata, ON, Canada, K2K 2E1
> phone: +1 613-270-9279 Ext 287
> fax: +1 613-270-9268
> 
>