Re: OSPF priority and neighbor command

I do not have the answer but i find it interesting and never noticed that
behavior before, but what you are saying makes some sense, if you set the
priority to 0 the router will not be "allowed" even if you configure the
neigbhor statement it keeps it out of the config for you...

because as you said it will take the command but does not show up in the
running configuration:

interface Serial0/0
 ip address 1.1.1.1 255.255.255.0
 encapsulation frame-relay
 clock rate 2000000
 no arp frame-relay
 no frame-relay inverse-arp
router ospf 1
 log-adjacency-changes
 network 1.1.1.1 0.0.0.0 area 0
 neighbor 1.1.1.3

*Mar 1 00:28:46.259: IP: s=1.1.1.1 (local), d=1.1.1.3 (Serial0/0), len 76,
sending, proto=89

R1(config-if)#int s0/0
R1(config-if)#ip ospf priority 0
R1(config-if)#do sh run int s0/0
interface Serial0/0
 ip address 1.1.1.1 255.255.255.0
 encapsulation frame-relay
 ip ospf priority 0
 clock rate 2000000
 no arp frame-relay
 no frame-relay inverse-arp
end

R1(config-if)#do sh run | s ospf
 ip ospf priority 0
router ospf 1
 log-adjacency-changes
 network 1.1.1.1 0.0.0.0 area 0

R1(config-if)#router ospf 1
R1(config-router)#neighbor 1.1.1.3

R1(config-router)#do sh run | s router ospf
router ospf 1
 log-adjacency-changes
 network 1.1.1.1 0.0.0.0 area 0

 --
Garry L. Baker

"With sufficient thrust, pigs fly just fine..." - RFC 1925

On Wed, Jul 13, 2011 at 6:37 AM, Aaron Riemer <ariemer_at_amnet.net.au> wrote:

> Hi Roy,
>
> Yes I understand that NBMA networks need to send unicast hello's. My
> confusion was based on the fact that:
> a) Hellos were not sent from the spoke if 'ip ospf priority 0' is
> configured
> (except in response to a unicast hello)
> b) the neighbor command is accepted under the routing process but does not
> take effect if priority is set to 0 as above.
>
> Thanks for your comments.
>
> -Aaron.
>
> -----Original Message-----
> From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
> Roy
> Khan
> Sent: Wednesday, 13 July 2011 11:03 AM
> To: ariemer_at_amnet.net.au; ccielab_at_groupstudy.com
> Subject: RE: OSPF priority and neighbor command
>
> NMBA Network type send hello as unicast when we use NMBA we need to specify
> nei statement what are the neig that will rec unicast.You issue this
> command
> on DR no need to specify on both sides.
> router ospf 1neighbor X
> check the debug ip packet detail command
> yes ip ospf pri 0 make the router out of election.
> > From: ariemer_at_amnet.net.au
> > To: ccielab_at_groupstudy.com
> > Subject: RE: OSPF priority and neighbor command
> > Date: Wed, 13 Jul 2011 10:41:30 +0800
> >
> > Further to this. Does this have something to do with the fact that the
> > priority 0 command takes the spoke router out of the running for DR/BDR
> > election?
> >
> >
> >
> > Hello's are not sent from the spoke until the spoke learns of the 'DR'??
> In
> > this case hello's must be initiated from the hub with the neighbor
> command.
> > Is this correct?
> >
> >
> >
> > Cheers,
> >
> >
> >
> > -Aaron.
> >
> >
> >
> > From: Aaron Riemer [mailto:ariemer_at_amnet.net.au]
> > Sent: Wednesday, 13 July 2011 10:28 AM
> > To: 'GS CCIE'
> > Subject: OSPF priority and neighbor command
> >
> >
> >
> > Hey guys,
> >
> >
> >
> > I am testing OSPF within an NBMA non-broadcast network. I ensure that the
> > spokes do not become DR/BDR by setting the priority to 0 on the relevant
> > frame relay spoke interface.
> >
> > What I have found is that with the priority set to '0' the router will
> not
> > accept the 'neighbor x.x.x.x' command under the ospf process. (When I say
> > accept I mean it is not visible within the configuration).
> >
> > This is a problem as unicast hello's are not sent to the hub and an
> > adjacency does not form. I found that removing the 'ip ospf priority 0'
> > command from the frame relay spoke interface would resolve the problem
> and
> > the neighbor command would be accepted and adjacencies would form.
> >
> > I know there are ways around this (set neighbor command on hub) but I am
> > just interested as to why this is occurring to help my understanding.
> >
> > Any comments greatly appreciated.
> >
> >
> >
> > Thanks,
> >
> >
> >
> > -Aaron.
> >
> >
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Received on Wed Jul 13 2011 - 15:07:39 ART