Hi, Fowler.
I believe when you said "unplugged the Ethernet connection between the
two", what you really did seems to me that you unplugged Router A from
a hub or switch.
That means the Ethernet interface of Router A is DOWN in state, while
the counterpart of Router B is still UP and BDR in the beginning.
Because Router B is still connected to the hub, what Router B is
missing is just a neighbor(DR: Router A), not its "UP" interface
state. If Router B is disconnected from the hub, the election will be
triggered right after disconnection, you don't have to wait 40
seconds.But in that election no DR or BDR will elected, because
there's no up interface out there including itself..
Hope it helps,
Regards
Jaeheon
On 6 Jan 2001 22:03:59 -0500, [EMAIL PROTECTED] ("Fowler, Joey")
wrote:
>I setup OSPF on between two routers, and Router A was elected as the DR
>becuase it had the highest IP address. Router B was elected BDR. I ran debug
>ip ospf adj on Router B and unplugged the Ethernet connection between the
>two. After 40 seconds Router B showed that it promoted itself to DR. Then I
>plugged the connection back in, and Router A was now selected as the BDR.
>This didn't make sense to me. I know that each time a router is added, that
>a new DRand BDR election does NOT take place, however shouldn't Router A
>still considered itself as the DR so when the connection was re-established
>it would either 1. remain as the DR or more likely 2. rerun the election
>since both routers think that they are the DR. I might could understand if
>there were multiple routers on the Ethernet connection. Any elightenment
>would be greatly appreciated. Meanwhile I'll go look at RFC 2328.
>
>Joey
>
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