Jan
08

By adjusting the hello/dead timers you can make non-compatible OSPF network types appear as neighbors via the "show ip ospf neighbor" but they won't become "adjacent" with each other.  OSPF network types that use a DR (broadcast and non-broadcast) can neighbor with each other and function properly.  Likewise OSPF network types (point-to-point and point-to-multipoint) that do not use a DR can neighbor with each other and function properly.  But if you mix DR types with non-DR types they will not function properly (i.e. not fully adjacent).  You should see in the OSPF database "Adv Router is not-reachable" messages when you've mixed DR and non-DR types.

Here is what will work:

Broadcast to Broadcast
Non-Broadcast to Non-Broadcast
Point-to-Point to Point-to-Point
Point-to-Multipoint to Point-to-Multipoint
Broadcast to Non-Broadcast (adjust hello/dead timers)
Point-to-Point to Point-to-Multipoint (adjust hello/dead timers)

INE
About INE

INE is the premier provider of technical training for the IT industry. INE is revolutionizing the digital learning industry through the implementation of adaptive technologies and a proven method of hands on training experiences. Our portfolio of trainings is built for all levels of technical learning, specializing in advanced networking technologies, next generation security and infrastructure programming and development. Want to talk to a training advisor about our course offerings and training plans? Give us a call at 877-224-8987 or email us at sales@ine.com

Subscribe to INE Blog Updates

New Blog Posts!