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DES-7200 Configuration Guide Chapter 4 OSPF
Configuration
4-40
OSPF NBMA network type configuration example
Requirements:
Configure NBMA network between A, B and C;
Device A is the designated router, and Device B is the backup designated
router;
All networks are in the same area;
Quicken topological convergence.
Detailed configurations
Since there is no special configuration about OSPF, we will use multicasting to
detect neighbors. If the interface is configured with the network type of NBMA,
then the interface won't send OSPF multicast packets. Therefore, the IP
addresses of neighbors shall be specified. You can configure shorter SPF
hold-time to quicken topological convergence.
Configurations on Device A:
# Configure WAN interface
interface Serial 1/0
ip address 192.168.123.1 255.255.255.0
encapsulation frame-relay
ip ospf network non-broadcast
ip ospf priority 10
# Configure OSPF routing protocol; the cost to reach device B is smaller.
router ospf 1
network 192.168.123.0 0.0.0.255 area 0
neighbor 192.168.123.2 priority 5
neighbor 192.168.123.3
timers throttle spf 500 1000 10000
Configurations on device B:
# Configure WAN interface
interface Serial 1/0
ip address 192.168.123.2 255.255.255.0
encapsulation frame-relay
ip ospf network non-broadcast
ip ospf priority 5
# Configure OSPF routing protocol
router ospf 1
network 192.168.123.0 0.0.0.255 area 0