reponse in-line.
----- Original Message -----
From: "Howard C. Berkowitz" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Friday, August 18, 2000 3:40 PM
Subject: Re: ospf lsu using 224.0.0.5 and 224.0.0.6 ?
>
>
> Yes, this is true, but not the whole story. As a study topic, why
> doesn't the reporting router send to the unicast address of the DR?
> Multicasts imply that more than one destination will listen. Who
> else would be interested in this update? Why?
The Backup Designated Router is interested in the update, because it needs
to automatically take over DR duties if the DR fails. If the OSPF neighbors
were using the DR's IP address (unicast) instead of the multicast address,
they would have to learn the new DR's IP address if the former DR went down.
With multicast, the LSU is just sent to 'All Designated Routers', and the
routers currently designated as DR and BDR respond to the packet.
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