Add an NBMA Neighbor
Add an NBMA neighbor for each interface that is eligible to become the DR.
An NBMA 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
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
Example
Create an NBMA neighbor that will not become the DR:
Switch:1(config-if)#ipv6 ospf nbma-nbr fe80:0:0:0:8217:7dff:fe76:8a03 0
Variable definitions
Use the data in the following table to use the ipv6 ospf nbma-nbr command.
Variable | Value |
---|---|
priority <0-255> | 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. |
WORD<0-43> | Specifies the IPv6 address of the neighbor. |