DR & BDR Election

[wu min <[e-mail]>]

Hi,

I am pretty new to OSPF and I have a couple of questions. I would appreciate
some help.

1. Can a router declares itself as DR and BDR simultaneously (just in case
that it may not be choosen to be a DR, it have some chance to take up BDR
post)?

2. Should *other* routers keep declaring themselves (eligible to be) DR or
BDR in HelloPackets eventhough both DR and BDR were already choosen?

3. In section 9.4, page 76 of RFC2328, step (4), why does the newly selected
DR or BDR (or resigning DR or BDR), is required to run step (2) and (3)
again? Take for instance, if it knew that it was being elected as the new
designated DR or BDR in the first run of step (2) and (3), repeating step
(2) and step (3) again will never change its view. Am I missing something
here?

4. Is it true that if a router that was previously a BDR (and also has been
declaring itself as BDR only in its HelloPacket), but now being elected as
new DR to replace the old one, must declare itself as DS in its subsequence
HelloPackets?

Thanks in advance.

-Tze Ven

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