[j-nsp] Faster OSPF DD Exchange

AnupKumarT 70695 anupkumart at huawei.com
Tue Dec 13 07:05:00 EST 2005

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?
> _______________________________________________
> juniper-nsp mailing list juniper-nsp at puck.nether.net
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