>At 09:40 AM 8/18/00, Howard C. Berkowitz wrote:
>>>Hi Jason:
>>>
>>>When there is a change a router forwards the LSU to the DR of the
>>>multiaccess network using the OSPF multicast 224.0.0.6. The DR
>>>acknowledges the receipt of the change and floods the LSU to the
>>>others int the multiaccess network using the OSPF multicast
>>>address 224.0.0.5.
>>>
>>>Hope this helps,
>>>
>>>Carlos Manjarres
>>>CCNA
>>
>>
>>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 (BDR) is interested also, in case it
>has to take over for the DR?
Right. When the BDR hears the update, it starts a timer. If the DR
doesn't respond when the timer expires, the BDR promotes itself to DR
and takes over.
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