Check the OSPF election rules. Once a DR and BDR are selected, if a router
with a higher priority or IP address is added to the network it will not
become the DR. If the DR is goes offline the BDR becomes the DR and a new
election for a BDR occurs. Once the DR comes back online, it does not
become the DR or BDR even if it has the highest IP address. As Chuck
mentioned this keeps the routers from continually changing who is the DR and
BDR.
-dlb
""Fowler, Joey"" <[EMAIL PROTECTED]> wrote in message
E37739B46CE9D311A76700508B6CAF293CAA8B@CORN">news:E37739B46CE9D311A76700508B6CAF293CAA8B@CORN...
> 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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