Hi ,
I agree with priscilla , but doesnt this master/slave relationship change
after the slave had sent its dd packets to the master then the master
becomes slave and sents the dd packets?
can you send me the report of ur sniffer priscilla cause i havent yet been
able to see this besides books
Priscilla Oppenheimer <[EMAIL PROTECTED]> wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> I don't think the master/slave business is related to DR and BDR. It has
to
> do with neighbor adjacency and establishing the protocol for exchanging
the
> link state database.
>
> After initializing, two neighbors establish bidirectional communication
and
> then enter the ExStart state. In this state, the routers establish a
> master/slave relationship and determine the initial database description
> (DD) sequence number.
>
> At first both neighbors will claim to be the master by sending an empty DD
> packet with the Master/Slave (MS) bit set to one. The neighbor with the
> lower Router ID will become the slave and will reply with a DD packet in
> which the MS bit is zero and the DD sequence number is set to the master's
> sequence number. This DD packet is the first one with actual data, that
is,
> LSA summaries.
>
> The routers then know who is the master and who is the slave and enter the
> Exchange state where they synchronize their link state databases.
>
> When I first looked at all of this on a Sniffer I was pleasantly surprised
> to discover how complicated it is! &;-) It's a little like a TCP 3-way
> handshake.
>
> Priscilla
>
>
> At 02:43 PM 1/16/01, Gopinath Pulyankote wrote:
> >Hello all,
> > Could someone explain what is master/slave relationship during DBD
> >exchange. My understanding is that since DR is the Router with the
highest
> >priority value, it will always be the master. So why have this definition
?
> >Or is it only used on Point-to-Point links, which don't elect DR & BDR?
> >TIA
> >Gopinath
> >
> >
> >
> >_________________________________
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>
> ________________________
>
> Priscilla Oppenheimer
> http://www.priscilla.com
>
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