Configuring the NBMA network type for an interface
After configuring the network type of an interface as NBMA, you must make some special configurations.
Because NBMA interfaces cannot find neighbors via broadcasting hello packets, you must specify neighbors and their router priorities. (A router priority of 0 means the router does not have the DR election right. A router priority greater than 0 means the router has the DR election right.)
The router priority configured with the ospf dr-priority command is for actual DR election. The priority configured with the peer command indicates whether a neighbor has the election right or not. If you configure the router priority for a neighbor as 0, the local router will assume the neighbor has no election right, and thus send no hello packets to this neighbor. However, if the local router is the DR or BDR, it still sends hello packets to the neighbor with priority 0 for neighborship establishment.
To configure the OSPF network type for an Interface as NBMA:
Step | Command | Remarks |
|---|---|---|
1. Enter system view. | system-view | N/A |
2. Enter interface view. | interface interface-type interface-number | N/A |
3. Configure the OSPF network type for the interface as NBMA. | ospf network-type nbma | By default, the network type of an interface depends on the link layer protocol. |
4. Configure a router priority for the interface. | ospf dr-priority priority | Optional. The default router priority is 1. |
5. Exit to system view. | quit | N/A |
6. Enter OSPF view. | ospf [ process-id | router-id router-id | vpn-instance vpn-instance-name ] * | N/A |
7. Specify a neighbor and its router priority. | peer ip-address [ cost value | dr-priority dr-priority ] | N/A |