The DR is elected first by highest priority, the tie breaker is highest RID. Then the process is repeated for the BDR.
http://www.cisco.com/warp/customer/104/2.html#10.1 My understanding is that if the DR goes down then the BDR is promoted to DR and an election is held for the new BDR. This means that when the original DR comes back up it can not become DR until both of the current DR and BDR go offline. Cheers, Mike DeVoe, Charles (PKI) wrote: > > If I am understanding this correctly. There are no routers up > in the > network. I turn on 3 routers simultaneously at the same time. > The routers > will first select the BDR. They will then look for the DR. > Since none > exist, the BDR will be promoted to DR. Then another election > will be held > to find a new BDR. Is this correct? > > -----Original Message----- > From: Zsombor Papp [mailto:[EMAIL PROTECTED] > Sent: Tuesday, August 05, 2003 11:01 AM > To: [EMAIL PROTECTED] > Subject: RE: OSPF DR and BDR elections [7:73504] > > > The DR is not chosen from the "remaining list." The DR is > chosen from the > list of routers that declared themselves designated routers > (this is why a > high-priority router that comes up late won't take over the DR > role from an > existing DR), or if no router declared itself DR, then the BDR > will become > DR (this is why a high-priority router that came up late won't > necessarily > become DR even if the existing DR dies). > > See RFC2328, Page 75 for more details. > > Thanks, > > Zsombor > > DeVoe, Charles (PKI) wrote: > > > > I am reading the CCNP/CCIP BSCI Study Guide by Todd Lammle > > from Sybex. In > > the OSPF section under the discussion of DR and BDR (page > 171) > > he says that > > the BDR is chosen first and that the DR is chosen from the > > reaming list. > > That seems illogical and backwards. Can someone please > confirm > > or deny and > > explain it. Thanks > **Please support GroupStudy by purchasing from the GroupStudy > Store: > http://shop.groupstudy.com > FAQ, list archives, and subscription info: > http://www.groupstudy.com/list/cisco.html > > Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=73558&t=73504 -------------------------------------------------- **Please support GroupStudy by purchasing from the GroupStudy Store: http://shop.groupstudy.com FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html
