It may be stated that way in the RFC, I have not checked, but the logic of it is il, as in illogical.
;-) Fred Reimer - CCNA Eclipsys Corporation, 200 Ashford Center North, Atlanta, GA 30338 Phone: 404-847-5177 Cell: 770-490-3071 Pager: 888-260-2050 NOTICE; This email contains confidential or proprietary information which may be legally privileged. It is intended only for the named recipient(s). If an addressing or transmission error has misdirected the email, please notify the author by replying to this message. If you are not the named recipient, you are not authorized to use, disclose, distribute, copy, print or rely on this email, and should immediately delete it from your computer. -----Original Message----- From: DeVoe, Charles (PKI) [mailto:[EMAIL PROTECTED] Sent: Wednesday, August 06, 2003 7:34 AM To: [EMAIL PROTECTED] Subject: RE: OSPF DR and BDR elections [7:73504] That is the point I needed clarification on. Just seemed odd that the DR would not be established first, followed by the BDR. For a brief moment when the routers are first started, there is no DR, but there is a BDR. I wonder what the logic for that is. -----Original Message----- From: Zsombor Papp [mailto:[EMAIL PROTECTED] Sent: Tuesday, August 05, 2003 8:20 PM To: [EMAIL PROTECTED] Subject: RE: OSPF DR and BDR elections [7:73504] Technically, the BDR is elected first. If no router is claiming to be a DR, then the BDR will be immediately promoted to DR. Nonetheless, the end result is pretty much what the web page referenced below describes. Thanks, Zsombor mccloud mike wrote: > > 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 **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 **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=73602&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
