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OSPF 2Way

‎07-02-2012 10:53 AM

Hi All,

 

I'm running an OSPF network (topology attached)

 

Router D is in the UK and sending out multicast traffic to routers A, B and C. All routers are running OSPF and are in a /26 network for the ports that are on the VPLS.

 

On router D I'm seeing 2 way to router C (using show ospf neighbour).

 

Can someone explain what that means please? I've read the documentation but I don't feel any the wiser for it.

 

Does it mean that for traffic from the "rest of network" switch to router C it will not go Switch->Router D -> Router C, but rather through another router first (either A or B)?

 

Thanks

 

Andrew.

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5 REPLIES 5
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Re: OSPF 2Way

‎07-02-2012 01:19 PM

Hello,

On OSPF network type "broadcast" the DROther routers (that is, not DR and not BDR) are seeing each other as 2Way.

So what you are reporting may be normal assuming C and D are not DR/BDR routers.

And no, 2Way does not mean packet from C has to get to D first in order to travel to subnet beyond A.

HTH

Rgds

Alex 

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Re: OSPF 2Way

‎07-05-2012 03:18 AM

So what you're basically saying is that this is normal?


That's great, thank you.

 

Regards


Andrew.

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Re: OSPF 2Way

‎07-05-2012 07:12 AM

This is normal behavior, when you have broadcast network.

Your router should see DR and BDR with state "FULL" and DROTHER in "2way " state.

 

Best Regards,
Misha
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Re: OSPF 2Way

‎08-31-2018 01:16 AM

How does one configure a router to be the DR or BDR?

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Re: OSPF 2Way

‎08-31-2018 02:20 AM

It's an election process.

 

Infuence the results by configuring priority.

 

Explained here:

 

https://www.juniper.net/documentation/en_US/junos/topics/topic-map/ospf-router-designated-router.htm...

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