I think I finally tracked this one down.
An IP Address out of the /30 that was the OSPF Network was defined on
another Router on an interface in the DOWN state. So the subnet/IP did
not show up in the routing table, or the OSPF Routing table, or even
that local routers routing table, but it must have caused some conflict
in the OSPF Process. Disabling the address on the remote router fixed
the route flapping. It was just causing Routes to change, the OSPF
Neighbor never flapped.
Found it purely by accident, not sure how I'd have tracked it down
otherwise since there was no route to the subnet and looked like it did
not exist since the interface it was assigned to was down.
On 10/12/2022 9:04 AM, castarritt wrote:
I made an IP conflict recently after goofing my documentation on a /28
and overlapping part of it with a /30 on the same router. It caused
the same sort of problem you were having.
On Wed, Oct 12, 2022 at 8:47 AM Nate Burke <n...@blastcomm.com
<mailto:n...@blastcomm.com>> wrote:
I changed the /30 that the OSPF network was using over the F425
and that
seems to have fixed it. The original /30 does not exist anywhere
else
on the network that I can find, either as a route, defined IP, or a
Router ID. I didn't think of changing that since it seemed to be a
weather event that triggered it in the first place, and it had been
working fine for months.
On 10/12/2022 7:11 AM, Dennis Burgess wrote:
> I would have to take a look, but sounds like duplicate routerID
or BFD. OSPF is pretty straight forward on this.
>
>
>
> Dennis Burgess, Mikrotik Certified Trainer
> MTCNA, MTCRE, MTCWE, MTCTCE, MTCINE, MTCSE, HE IPv6 Sage,
Cambium ePMP Certified
> Author of "Learn RouterOS- Second Edition"
> Link Technologies, Inc -- Mikrotik & WISP Support Services
> Office: 314-735-0270 Website: http://www.linktechs.net
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>
> -----Original Message-----
> From: AF <af-boun...@af.afmug.com
<mailto:af-boun...@af.afmug.com>> On Behalf Of Nate Burke
> Sent: Tuesday, October 11, 2022 5:18 PM
> To: AnimalFarm Microwave Users Group <af@af.afmug.com
<mailto:af@af.afmug.com>>
> Subject: Re: [AFMUG] OSPF Pulling my hair out
>
> I changed the RB4011 to a RB2009, and tried downgrading the
RB4011 to
> ROS6.49.6 from ROS7.5 and it's doing the exact same thing. I've
tried setting up an EoIP Tunnel across the F425, and changed the
Router ID in OSPF. Still doing the exact same thing. As soon as
I enable the F425 link, the Entire route table will flap between
the Powerbridge and the
> F425 even though the powerbridge is a cost of 20 higher than the
F425.
> If I disable the F425, everything is stable over the
Powerbridge. Not sure what else to try.
>
> On 10/6/2022 4:22 PM, Robert Haas wrote:
>> Make sure you haven't duplicated your router id.
>>
>>
>>
>> -----Original Message-----
>> From: AF <af-boun...@af.afmug.com
<mailto:af-boun...@af.afmug.com>> On Behalf Of Nate Burke
>> Sent: Tuesday, October 4, 2022 1:58 PM
>> To: AnimalFarm Microwave Users Group <af@af.afmug.com
<mailto:af@af.afmug.com>>
>> Subject: [AFMUG] OSPF Pulling my hair out
>>
>> I have a site with a RB4011 connected via an old M5
Powerbridge, and an EPMP PTP425. The 4011 is running ROSv7,
everything else is on ROSv6. Connecting to a CCR1036 and CCR1009
on the other ends of the radios.
>>
>> Everything was working perfectly for several months until a
storm came
>> through, and now the F425 OSPF Session will not stay stable.
The OSPF
>> Weights are set to prefer the F425 link. The OSPF neighbor
never goes
>> down, Adjacency/state never change, but the RB4011 will update it's
>> entire routing table about every 5 seconds and flap back and forth
>> between the Powerbridge and the F425. The remote routers never
update
>> the route to the 4011, it is stable over the F425. If I disable the
>> F425 neighbor, everything is stable over the powerbridge. If I
disable the Powerbridge neighbor, the router will lose
connectivity for a second every 10 or 15 seconds, like it loses
it's routing table.
>>
>> There is no packet loss across the F425 link, and it will Tik
to Tik bw test at 100MB sync no problem and no packet loss. I've
even tried changing ports on the 4011, plugging the F425 into a
completely separate OSPF router on the remote end. I've also put
the traffic through a VLAN on the F425 to see if the F425 was
doing something weird with the packets. The F425 radios on both
ends have been power cycled. I've also updated ROS to the latest
7beta, and no change.
>>
>> I'd think this is an issue with ROSv7/6 since the routing table
keeps updating, but the powerbridge link is always fine, so it
feels like something with the F425. Especially since it happened
after a storm.
>> But at the same time, how could a failure of the F425 be
affecting OSPF? When I do OSPF Logging on the 4011, nothing is
looking out of the ordinary. I guess I could try physically
changing the 4011, but I've never had a failure like that before.
>>
>> Mainly I just want to vent that I'm probably missing something
stupid, I just haven't been able to figure out what it is yet.
>>
>>
>
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