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homerwsmith
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ospf nbma 3 routers

Sun Jul 18, 2021 6:18 am

I have 4 routers bridged together on a single ethernet without vlans

R1 is the master that they call connect to on ether1.

OSPF is flapping on some of those links.

I wish to try using NBMA and tcp/ip for those flapping links.

Are the following true?

1.) If I use NBMA on one of those routers, I have to use it on all 4 of them.

2.) If I put a vlan 1 on two of the routers R1 and R2 with a unique subnet, can I use nbma on that vlan1, and use broadcast on the others that have no vlan?

3.) Each router has a unique individual subnet to R1., do I have to connect them all via a single subnet and use that for NBMA setup?
Ie. I can't use multiple different networks on the same lan for the NBMA.

3.) Only R1 should be priority 1 and he rest are priority 0. Can I have more than one be priority 1 in case one goes down?

Thanks in advance Homer

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