📖 What is Designated Router (DR)?
A router elected on an OSPF multi-access network (like Ethernet) to act as a central point for collecting and distributing routing information.
🥋
Sensei Says:
"The DR minimizes LSA flooding. All other routers (except the BDR) form a FULL adjacency only with the DR and BDR, remaining in the 2-WAY state with each other."
📚 Certification: Certified Network Associate (200-301)
🔑 What are the Key Concepts of Designated Router (DR)?
- ▸ LSA traffic reduction
- ▸ Multi-access networks
- ▸ Type 2 Network LSA generation
🎯 How does Designated Router (DR) appear on the 200-301 Exam?
Verifying which router was elected DR on an Ethernet segment.
Manipulating OSPF priority to force a specific router to become the DR.
❓ Frequently Asked Questions
Are DRs elected on point-to-point links?
No, DRs and BDRs are only elected on multi-access networks like Ethernet.
What IP address do DROTHERs use to send updates to the DR?
They use the multicast address 224.0.0.6 (AllDRRouters).
Related Terms from Certified Network Associate
DTP (Dynamic Trunking Protocol)
Threat
DROTHER
WPA2 (Wi-Fi Protected Access 2)
Control and Provisioning of Wireless Access Points (CAPWAP)
Address Resolution Protocol (ARP)