Step 1. Verify the IP address and netmask assignments used on the NBMA network interfaces.
Step 2. Verify that the proper DLCIs and IP addresses arebeing used. These can be checked using theshow frame-relay map command.
rtrA#show frame-relay map
Serial0/0.2 (up): point-to-point dlci, dlci 102(0x66,0x1860), broadcast status defined, active Seria 10/0.1 (up): point-to-point dlci, dlci 101(0x65,0x1850), broadcast status defined, active
Step 3. Before configuring OSPF, check IP connectivity by pinging the other end of each Frame Relay link.
Step 4. If you are mixing network types (multipoint and point-to-point), verify that the Hello intervals match on all routers.
• priority— The OSPF priority value for the interface. The range of values is 0 to 255. The default value is 1.
Purpose: On a multiaccess network such as Ethernet, the router with the highest priority will be elected the DR. If all interface priorities are equal, then the router with the highest router ID will be elected the DR. The ip ospf priority command is used to influence the selection of the DR on a multiaccess network. If the priority is 0, then the router will not be elected the DR or BDR.
Initial Cisco IOS Software Release: 10.0
In Figure 19-14, Router B will be elected the DR on the Ethernet network because Router B has a higher router ID than Router A and their OSPF priorities on the Ethernet network are equal.
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