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Re: Two week Last Call on LMP (Sections 12.3.3 and 12.3.4)
Hi Young,
1. Yeah events 1.evCCup and 2.evCCDown has to be added in the Data Link
FSM's in the down state also. Agreed.
2. Transtition 10:evLnkDealloc can be possible know even in the degraded
state. Yeah a control channel is needed, but this event can also be a
external event know, from the user or a network management event. If this
is possible then this event is required in this state. Kindly clarify me.
3. Also event 14.evdcDown can also possible in Test/Pasv Test state. Since
to send a Test message or to receive a Test message we need a data channel.
If you see both the FSM's ( Data link ) event 3 & 4 will pose the next
state to Test & Pasv Test state from Up/Free state. So the event
14.evdcDown is also possible on both the states and hence the next state in
both the case will be down.
Thanks,
Ramesh
George Young wrote:
> Looking at the Data Link FSMs in Sections 12.3.3 and 12.3.4 of
> draft-ietf-ccamp-lmp-02.txt:
>
> 1) It appears that in the Down state, the control channel can be either
> up or
> down. That being the case, there should be transitions for events 1
> :evCCUp:
> and 2 :evCCDown: from Down to Down.
>
> 2) Transition 10:evLnkDealloc: from Deg to Down would appear to be
> impossible,
> as there is no control channel available, and the control channel is
> required to coordinate taking the channel down at both ends. I believe
> this
> transition should be removed.
>
> With these changes, the FSMs would look like:
>
> 12.3.3. Active Data Link FSM Description
>
> Figure 5 illustrates operation of the LMP active data link FSM in a
> form of FSM state transition diagram.
>
> 1,2
> +------+
> | |
> | +------+
> +-->| |<-------+
> +--------->| Down | |
> | +----| |<-----+ |
> | | +------+ | |
> | |5b 3| ^ | |
> | | | |2,7 | |
> | | v | | |
> | | +------+ | |
> | | | |<-+ | |
> | | | Test | |11 | |
> | | | |--+ | |
> | | +------+ | |
> | | 5a| 3^ | |
> | | | | | |
> | | v | | |
> |2,12 | +---------+ | |
> | +-->| |14 | |
> | | Up/Free |----+ |
> +---------| | |
> +---------+ |
> 9| ^ |
> | | |
> v |10 |
> +-----+ 2 +---------+ |
> | |<--------| |13 |
> | Deg | |Up/Alloc |------+
> | |-------->| |
> +-----+ 1 +---------+
>
> Figure 5: Active LMP Data Link FSM
>
> 12.3.4. Passive Data Link FSM Description
>
> Figure 6 illustrates operation of the LMP passive data link FSM in a
> form of FSM state transition diagram.
>
> 1,2
> +------+
> | |
> | +------+
> +-->| |<------+
> +---------->| Down | |
> | +-----| |<----+ |
> | | +------+ | |
> | |5b 4| ^ | |
> | | | |2,8 | |
> | | v | | |
> | | +----------+ | |
> | | | PasvTest | | |
> | | +----------+ | |
> | | 6| 4^ | |
> | | | | | |
> | | v | | |
> |2,12 | +---------+ | |
> | +--->| Up/Free |14 | |
> | | |---+ |
> +----------| | |
> +---------+ |
> 9| ^ |
> | | |
> v |10 |
> +-----+ +---------+ |
> | | 2 | |13 |
> | Deg |<--------|Up/Alloc |-----+
> | |-------->| |
> +-----+ 1 +---------+
>
> Figure 6: Passive LMP Data Link FSM
>
> Regards,
> George R. Young
> 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: Kireeti Kompella [mailto:kireeti@juniper.net]
> >Sent: Monday, November 12, 2001 9:00 PM
> >To: ccamp@ops.ietf.org
> >Subject: Two week Last Call on LMP
> >
> >
> >Hi All,
> >
> >This is to announce a two week Last Call on the LMP draft:
> >draft-ietf-ccamp-lmp-02.txt. This Last Call ends COB Wed Nov 28.
> >
> >Please send questions, comments and requests for clarifications
> >to the CCAMP list.
> >
> >Kireeti.
> >
> >