In the video, Russ discusses the designated and backup designated routers used in OSPF. Learn how the DR and BDR create an efficient communication model within OSPF.
- [Narrator] In this lesson, we are going to discuss…the OSPF designated router and backup designated router.…Now, the designated router allows OSPF…to centralize communication of LSAs…in a multi-access situation.…Now, this allows us to form many fewer neighborships,…saving us on overall communication overhead.…We will basically elect a router representative…of multiple routers that share a single link.…This means that they are basically connected by a switch.…
So here we can see a diagram of what I'm talking about.…We have five routers that are connected together…over a switch, and it could even be…multiple switches if you like.…Now this means that they are sharing the same subnet.…And for our purposes, from a router perspective,…it is almost as if they are sharing the same segment.…Now, they aren't, but from a Layer 3 perspective…it does look that way.…Now notice that we have one DR here…that's going to be in this environment.…And we could have multiple DRs in an area.…
Remember that DRs are elected per multi-access environment.…
- Static routing
- Dynamic routing
- Interior vs. exterior routing protocols
- InterVLAN routing
- OSPF routing
- EIGRP routing
- Other routing protocols
Skill Level Intermediate
Cisco ICND2 Cert Prep: Switchingwith Russell Long2h 20m Intermediate
Cisco ICND2 Cert Prep: Infrastructure Serviceswith Russell Long2h 8m Intermediate
2. InterVLAN Routing
5. Other Protocols
RIP, BGP, and MPLS6m 57s
Next steps2m 33s
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