[j-nsp] Faster OSPF DD Exchange

[E.T.Metz at telecom.tno.nl]

	I assume this might happen when multiple parallel links exist
between the peers (and multiple adjacencies are established across these
simultaniously).

(but I must admit I'm not entirely sure what the situation/problem is
you're referring to here)

/Eduard

> -----Original Message-----
> From: juniper-nsp-bounces at puck.nether.net 
> [mailto:juniper-nsp-bounces at puck.nether.net] On Behalf Of 
> AnupKumarT 70695
> Sent: dinsdag 13 december 2005 13:05
> To: Doug Marschke
> Cc: juniper-nsp at puck.nether.net
> Subject: Re: RE: [j-nsp] Faster OSPF DD Exchange
> Importance: High
> 
> 
> Sorry. My question was not worded correctly.
> 
> Does anybody know of OSPF peers exchanging more than 1 DD 
> packet SIMULTANEOSULY
> during adjacency formation?
> 
> 
> 
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> ----- Original Message -----
> From: Doug Marschke <doug at ipath.net>
> Date: Tuesday, December 13, 2005 6:51 am
> Subject: RE: [j-nsp] Faster OSPF DD Exchange
> 
> > This is normal.  First have to establish "mastership" then you 
> > send out DD's
> > for synchronization.        
> > 
> > 
> > 
> > This sending and receiving of Database Description packets is
> >        called the "Database Exchange Process".  During this process,
> >        the two routers form a master/slave relationship.  Each 
> > Database        Description Packet has a sequence number.  
> > Database Description
> >        Packets sent by the master (polls) are acknowledged by the 
> > slave        through echoing of the sequence number.  Both polls 
> > and their
> >        responses contain summaries of link state data.  The 
> > master is
> >        the only one allowed to retransmit Database Description 
> > Packets.        It does so only at fixed intervals, the length of 
> > which is the
> >        configured per-interface constant RxmtInterval.
> > 
> >        Each Database Description contains an indication that 
> > there are
> >        more packets to follow --- the M-bit.  The Database Exchange
> >        Process is over when a router has received and sent Database
> >        Description Packets with the M-bit off.
> > 
> >        During and after the Database Exchange Process, each 
> > router has
> >        a list of those LSAs for which the neighbor has more up-to-
> > date        instances.  These LSAs are requested in Link 
> State Request
> >        Packets.  Link State Request packets that are not 
> > satisfied are
> >        retransmitted at fixed intervals of time RxmtInterval.  
> > When the
> >        Database Description Process has completed and all Link State
> >        Requests have been satisfied, the databases are deemed
> >        synchronized and the routers are marked fully adjacent.  
> > At this
> >        time the adjacency is fully functional and is advertised 
> > in the
> >        two routers' router-LSAs.
> > 
> > 
> > 
> > -----Original Message-----
> > From: juniper-nsp-bounces at puck.nether.net
> > [juniper-nsp-bounces at puck.nether.net] On Behalf Of AnupKumarT 70695
> > Sent: Monday, December 12, 2005 5:55 AM
> > To: AnupKumarT 70695
> > Cc: juniper-nsp at puck.nether.net
> > Subject: [j-nsp] Faster OSPF DD Exchange
> > 
> > Does anybody know of OSPF peers exchanging more than 1 DD packet 
> > duringadjacency formation?
> > 
> > _______________________________________________
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> > 
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