📖 What is DROTHER?
An OSPF router on a multi-access network that has not been elected as either the DR or the BDR.
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Sensei Says:
"DROTHERs communicate routing updates to the DR and BDR using the multicast address 224.0.0.6. They receive updates from the DR on 224.0.0.5."
📚 Certification: Certified Network Associate (200-301)
🔑 What are the Key Concepts of DROTHER?
- ▸ Non-DR/BDR routers
- ▸ 2-WAY adjacency state
- ▸ Multicast communication
🎯 How does DROTHER appear on the 200-301 Exam?
Verifying OSPF neighbor states and seeing '2-WAY/DROTHER' instead of FULL.
Ensuring DROTHERs are successfully forming full adjacencies with the DR/BDR.
❓ Frequently Asked Questions
Why do DROTHERs stay in the 2-WAY state with each other?
To reduce overhead. They only form FULL adjacencies with the DR and BDR to exchange routing information.
How do DROTHERs learn about new routes?
The DR sends LSAs to all DROTHERs using the multicast address 224.0.0.5.
Related Terms from Certified Network Associate
Access Port
Chef
WPA2 (Wi-Fi Protected Access 2)
Network Time Protocol (NTP)
Inside Local Address
Next-Hop IP Address