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New Member

OSPF neighbors with L3 links

The latest HA Campus Design shows putting a higher priority on the interface of the distribution so it will become DR instead of the access switch. Is there a reason not to do a "ip ospf non-broadcast" on the routed interface and put the neighbor in with a "neighbor x.x.x.x" statement under the "router ospf x" section? Should the far end IP of the link or can the loopback IP be used?


Re: OSPF neighbors with L3 links

Hello Glenn,

I am not shure what design guide you are referring to but, in case of a broadcast multi-access network you can change the priority on the access switch to prevent it from joining DR/BDR elections. You can change the priority on the distribution/core switch to a higer priority for preffered DR and BDR candidate.

!Access Switch


interface GigabitEthernet1/0/1

no switchport

ip address

ip ospf priority 0




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New Member

Re: OSPF neighbors with L3 links


I will suggest you to put ip ospf network point-to-point if you are using neighbor command in broadcast network in this scenerio there won't be any DR/BDR and hello's for all neighbor will also be unicast not broadcass.

Regarding the neighbor ip to be use i think you should use interface ip addresses bcos if any how loopbacks are not reachable than there could be problem with ospf working.

HTH please rate if it helps.


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