Adding an NBMA neighbor
Add an NBMA neighbor for each interface that is eligible to become the DR.
An NMBA interface with a positive nonzero router priority is eligible to become the DR for the NBMA network and is configured with the identification of all attached routers, IPv6 addresses, and router priorities.
Before you begin
Identify the following information:
specific interfaces to include in the NBMA network
the IPv6 address for each interface
the router priority for each interface
the hello interval for the network
the router dead interval for the network
the poll interval for the network
-
Change the VRF instance as required to configure OSPFv3 on a specific VRF instance.
About this task
In contrast to a broadcast network where switches multicast (send to AllSPFRouters and AllDRouters) certain OSPF protocol packets, switches replicate and send NBMA packets to each neighboring router as unicast. NBMA networks drop all OSPF packets with destination addresses AllSPFRouters and AllDRouters. Because the NBMA network does not broadcast, you must manually configure a list of neighbors and priorities for all routers in the network that can become the DR. Potential DRs use a positive nonzero router priority.
Procedure
- In the navigation tree, expand the following folders: .
- Click OSPFv3.
- Click the NBMA Neighbors tab.
- Click Insert.
- Select the IPv6 port or VLAN interface.
- Specify the IPv6 address for the neighbor.
- Specify the priority for the neighbor.
- Click Insert.
NBMA Neighbors field descriptions
Use the data in the following table to use the NBMA Neighbors tab.
Name | Description |
|---|---|
IfIndex | Specifies the link ID for the link over which the switch reaches the neighbor. |
Address | Specifies the IPv6 address of the neighbor. |
Priority | Specifies the priority to use for this neighbor in the designated router election process. A value of 0 indicates the neighbor cannot become the designated router. The higher the priority value, the higher chance the switch will win the election process. The default is 1. |
RtrId | Identifies the neighboring router in the autonomous system. The value is 0.0.0.0 until the switch receives a hello message from the neighbor. |
State | Identifies the state of the relationship with the neighbor. The state can be one of the following:
|