R2(config)# interface Serial0/0.1 multipoint R1(config-fr-dlci)# frame-relay interface-dlci 1004 R1(config-fr-dlci)# frame-relay interface-dlci 1003 R1(config-subif)# frame-relay interface-dlci 1002 R1(config-subif)# ip ospf network point-to-multipoint non-broadcast Highlighted with red are OSPF network type configurations. Next you see configurations for routers with interfaces, OSPF, PVCs and mappings configured. R2, R3 and R4 are in the same subnet and to reach each other we’ll add some mappings which will go to R1 as a transit point. R2, R3 and R4 all have only one PVC to conect to R1. R1 has Permanent Virtual Circuits (PVC) with all other routers while others have only with R1. With these in mind I will start to set up our lab, will use the same topology like in previous articles. So, if neighbor discovery doesn’t take place we must add them manually under router configuration section. This OSPF network type behaves like a hybrid between multipoint non-broadcast and point-to-multipoint because DR/BDR election does not happen (multipoint non-broadcast) and Neighbor discovery the same (point to multipoint) which results from ‘nonbroadcast’ keyword in router configuration command. In this lab we will discuss about OSPF Point to Multipoint non-broadcast over Frame Relay, will briefly compare with previously discussed OSPF network types and will build a lab to show how it works.

This article is a completion of two previously discussed labs where we talked about OSPF multipoint Non-Broadcast over Frame Relay and OSPF Point to Multipoint over Frame Relay.

Ip ospf network types