Hello Brian
When you implement the ip ospf network point-to-multipoint
command, essentially you are telling the router NOT to elect a DR/BDR.
If you want DR/BDR to be elected, then you must change the network type to ip ospf network broadcast
. With this command on the interface, you must also include the frame relay map
command as broadcast
as well (as you said you have already done so).
To review, for OSPF with frame relay, you have the following different types of netowrks:
Point to Point configuration
This is where you have one interface connecting with another interface on one PVC where the link between the two is contained in one subnet. No DR/BDR is elected. In this case, as an example, you have the interface configured as follows:
interface Serial0.1 point-to-point
ip address 1.1.1.2 255.255.255.0
frame-relay interface-dlci 16
Multipoint configuration with broadcast network
This is where the network is viewed as a broadcast multi access network where DR and BDR are elected. An example configuration is the following. Notice the ip ospf network broadcast
command:
interface Serial0.2 multipoint
ip address 1.1.1.2 255.255.255.0
ip ospf network broadcast
frame-relay map ip 1.1.1.2 16 broadcast
Multipoint Configuration with Non-Broadcast Network
Here the network is non broadcast, so neighbours cannot be discovered automatically. With this configuration, neighbours must be manually configured. Once neighbours are created, DR and BDR are elected because of the multi access nature of the topology. In this configuration it is a good idea to An example configuration is the following:
interface Serial0.2 multipoint
ip address 1.1.1.2 255.255.255.0
frame-relay map ip 1.1.1.1 16 broadcast
Multipoint Configuration with Point-to-Multipoint Network
Finally, this configuration essentially allows the network to function as a collection of point to point links. Neighbours are discovered automatically, but DR and BDR elections DO NOT TAKE PLACE. An example configuration is the following:
interface Serial0.2 multipoint
ip address 1.1.1.2 255.255.255.0
ip ospf network point-to-multipoint
frame-relay map ip 1.1.1.1 16 broadcast
For more detailed information concerning OSPF and frame relay, take a look at http://www.cisco.com/c/en/us/support/docs/ip/open-shortest-path-first-ospf/13693-22.html#configs. It’s old but it is still valid.
I hope this has been helpful!
Laz