RE: relationship of ChannelFail and Data Link FSM

["George Young" <george.young@edgeflow.com>]

Hello Jonathan,

Thanks for the clarification.

Does this mean there should be a transition in the Active Data Link FSM
Description from Up/Alloc to Down, triggered by a 'failure localized'
event?

Regards,
George.
edgeflow Inc.
329 March Rd., Kanata, ON, Canada, K2K 2E1
phone: +1 613-270-9279 Ext 287
fax: +1 613-270-9268


>-----Original Message-----
>From: Jonathan Lang [mailto:jplang@calient.net]
>Sent: Monday, September 10, 2001 1:13 PM
>To: George Young; ccamp@ops.ietf.org
>Subject: RE: relationship of ChannelFail and Data Link FSM
>
>
>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
>> 
>> 
>