Well that depends
How long does the device take to boot up compared to other devices When is the device ready to participate in the OSPF election process (running more services on a device may take it longer to start participating compared to a router with less services) DR and BDR election is done via the Hello protocol - OSPF Network Type | Hello | DR/BDR | _________________________________________ Broadcast | 10sec | Elects DR/BDR| _________________________________________ NonBroadcast | 30sec | Elects DR/BDR| _________________________________________ P2MP | 30sec | No DR/BDR | _________________________________________ P2MP NonBroadcast | 30sec | No DR/BDR | _________________________________________ P2P | 10sec | No DR/BDR | If you want to control which devices become the DR/BDR you can use "ip ospf priority" and set all devices that you do not want to be DR/BDR to "0" Not sure exactly how may hellos before the DR/BDR election takes place, perhaps I will lab it up to see - HTH From: [email protected] [mailto:[email protected]] On Behalf Of David Betz Sent: November-23-10 7:32 PM To: [email protected] Subject: [OSL | CCIE_RS] OSPF Election Time I've not been able to figure this out nor can I find any documentation for this: how long does OSPF wait for others to cast their vote before doing the DR/BDR election? If R1, R2, and R3 come online with 10.1.1.X/25 (X=RX) ip addresses, and R1 and R2 see each other's messages, they will start an election. If R3 is there, it wins... if it's too late, R2 wins. When is "too late"?
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