Re: [Idr] draft-ietf-idr-bgp4-26.txt: active state (page 61)

Probably two connections.  Event 17 in the Connect state should have been
preceded by Event 14 TcpConnection_Valid in Connect state, most likely with
DelayOpenTimer running.

But the intention of this fsm is to model all that happens between a particular
pair of configured peers with a single fsm at each end.  (Modelling each
connection between a particular pair of peers as an fsm requires a different set
of events and states; it was discussed but would have greater changes to the
existing specification which was not considered within the remit of the WG).
The challenge then is, as discussed in 8.2.1, that the identifier of the peer is
not known until OPENs are exchanged, so each tcp connection may start as a
separate fsm and then when it becomes apparent that there is already an fsm for
this peer,  6.8 BGP connection collision detection  comes into play and you end
up with one.  But you are not required to implement it this way as long as the
appearance you present conforms with the specification.  You may choose to know
from the TCP SYN that this packet relates to an existing fsm and not create a
second.

As with any fsm, it is a matter of judgement what states there are, what events
there are.  What you see is considered the best compromise.  Read section 8.2.1
carefully; it says what there is to be said.

Tom Petch

----- Original Message -----
From: "saravana kumar" <skumar_saravana@yahoo.com>
To: "Tom Petch" <nwnetworks@dial.pipex.com>; <idr@ietf.org>
Sent: Thursday, June 02, 2005 11:22 PM
Subject: Re: [Idr] draft-ietf-idr-bgp4-26.txt: active state (page 61)

> correction: Read that as Event 17.
> -skumar.
> --- Tom Petch <nwnetworks@dial.pipex.com> wrote:
>
> > I don't follow you here.  Event 16 I would regard as
> > outbound connection
> > complete; I sent SYN, received SYN-ACK and sent ACK
> > (TCP three-way handshake).
> > Connection established, I send BGP OPEN (or start
> > the DelayOpen timer); I don't
> > see a second connection.
> >
> > Tom Petch
> >
> > ----- Original Message -----
> > From: "saravana kumar" <skumar_saravana@yahoo.com>
> > To: "Tom Petch" <nwnetworks@dial.pipex.com>;
> > <idr@ietf.org>
> > Sent: Thursday, June 02, 2005 4:35 PM
> > Subject: Re: [Idr] draft-ietf-idr-bgp4-26.txt:
> > active state (page 61)
> >
> > > In the connect state, if Event 16 happens (inbound
> > > connection was successful), the draft suggests
> > > "sending an open or start open delay timer."
> > >
> > > Aren't there two connections (fsms ) to track here
> > :
> > > one for the pending outbound connection and the
> > > inbound connection?
> > >
> > > Thanks,
> > > -skumar.
> > >
> > <snip>
> >
> >
>
>
>
>
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