Tuesday, May 31, 2011

OSPF: unicast instead of multicast explanation?

"If the OSPF link is on a Non Broadcast Multi Access link, such as a frame relay, the OSPF packet will be a unicast rather than multicast." anyone explain this?


  1. Steve, nice to see you getting into the habit. This will all add up in the long run.

  2. This is because FR does not allow multicasting or broadcasting. There is a broadcast command proprietary to Cisco but all it does is send an individual broadcast to every device in the network. This is not a true broadcast.