Hello,
I recently moved a network from Static Routing to OSPF, very simple implementation as I always did it on Cisco and Juniper with no big problems.
So, I did the setup normally, all my routes arrived in every router's routing table, that's all ok so far.
However, 30 minutes later, boom. Every OSPF route is gone. I had to disable and enable the OSPF instance in order to get the routes back.
It is happening randomly from every 30 minutes to a hour.
Anyone else having this problem?
I'm using public IPs with a PPPoE Server, Static Routes is becoming a pain with over 500 routes to work with. (/23 ip block)
Re: OSPF losing routes randomly
I assume you are using a OSPF loopback interface on each ospf device?
Re: OSPF losing routes randomly
Yes, using a loopback interface for the Router ID.I assume you are using a OSPF loopback interface on each ospf device?
Re: OSPF losing routes randomly
Are you using this over wireless point-to-point links that are being created by external devices (Ubiquiti)?
Many people recommend using link-type of NBMA and statically-defining the neighbors because the multicast traffic (OSPF hellos) tends to get dropped by these UBNT links, especially when the links carry significant traffic at or near the max throughput rate.
If this is your setup, and you change to NBMA and the problem persists, you may also need to set DSCP on the OSPF packets to 46 so that the UBNT gear will prioritize the OSPF traffic.
Many people recommend using link-type of NBMA and statically-defining the neighbors because the multicast traffic (OSPF hellos) tends to get dropped by these UBNT links, especially when the links carry significant traffic at or near the max throughput rate.
If this is your setup, and you change to NBMA and the problem persists, you may also need to set DSCP on the OSPF packets to 46 so that the UBNT gear will prioritize the OSPF traffic.
Re: OSPF losing routes randomly
OSPF is running between 4 CCR1009 in the same rack, connected through Cat6a cables.Are you using this over wireless point-to-point links that are being created by external devices (Ubiquiti)?
Many people recommend using link-type of NBMA and statically-defining the neighbors because the multicast traffic (OSPF hellos) tends to get dropped by these UBNT links, especially when the links carry significant traffic at or near the max throughput rate.
If this is your setup, and you change to NBMA and the problem persists, you may also need to set DSCP on the OSPF packets to 46 so that the UBNT gear will prioritize the OSPF traffic.
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StubArea51
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Re: OSPF losing routes randomly
What version of RouterOS is on each router?
Re: OSPF losing routes randomly
Newest version.What version of RouterOS is on each router?
6.35.2 on all 4 routers.
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StubArea51
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Re: OSPF losing routes randomly
Do you see the same issue if you use the latest bugfix version on all routers? Can you post configs?
Re: OSPF losing routes randomly
Same issue with lastest bugfix version.Do you see the same issue if you use the latest bugfix version on all routers? Can you post configs?
Configs:
Border:
Code: Select all
/routing ospf instance
set [ find default=yes ] distribute-default=always-as-type-1 name=BORDER \
router-id=10.10.0.1
/routing ospf interface
add interface=loopback0 network-type=point-to-point
/routing ospf network
add area=backbone network=10.10.0.1/32
add area=backbone network=177.131.x.x/28
Code: Select all
/routing ospf instance
set [ find default=yes ] name=TIMBU router-id=10.10.1.1
/routing ospf network
add area=backbone network=177.131.x.x/28
add area=backbone network=10.10.1.1/32
add area=backbone network=100.64.0.0/23
add area=backbone network=10.10.0.1/32177.131.x.x/28 is used to communicate between routers, I also have Private IPs set for administration, but this is mainly for tracing routes.
10.20.0.128/28 is used for the administration.
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StubArea51
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Re: OSPF losing routes randomly
Which ports are you using on the CCR1009 to connect the routers together?
Re: OSPF losing routes randomly
BORDER (eth7) to 24p managed switchWhich ports are you using on the CCR1009 to connect the routers together?
Managed switch to port 8 Router #1
Managed switch to port 8 Router #2
Managed switch to port 8 Router #3
Managed switch to port 8 Router #4
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StubArea51
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Re: OSPF losing routes randomly
If possible, connect the routers together with a different switch and see if you still have the issue. Another option would be to run a packet capture just for OSPF on eth8 on several different routers to try and catch why this is happening.
We run OSPF/BGP and MPLS on large production networks with CCRs of all models and don't see the issue you're describing unless there is some kind issue in the ethernet transport whether it's RF, copper or fiber.
Hopefully you're not running BFD with OSPF on the CCR1009?
We run OSPF/BGP and MPLS on large production networks with CCRs of all models and don't see the issue you're describing unless there is some kind issue in the ethernet transport whether it's RF, copper or fiber.
Hopefully you're not running BFD with OSPF on the CCR1009?
Re: OSPF losing routes randomly
Only OSPF running.If possible, connect the routers together with a different switch and see if you still have the issue. Another option would be to run a packet capture just for OSPF on eth8 on several different routers to try and catch why this is happening.
We run OSPF/BGP and MPLS on large production networks with CCRs of all models and don't see the issue you're describing unless there is some kind issue in the ethernet transport whether it's RF, copper or fiber.
Hopefully you're not running BFD with OSPF on the CCR1009?
I have static routes distance set to 200, and OSPF distances set to 100 so I can test the OSPF routing without network interruption.
I'll try keeping just 1 router with OSPF enabled for the time, the rest will be done through static routing, so I can see if it is a particular router messing everything up.
Will post results soon.
(Also I already tried connecting them directly, same problem)
Re: OSPF losing routes randomly
Okay its been 2 hours since the system is running with OSPF enabled only between BORDER and Router #1, no problems so far, so we passed the 30 minutes - 1 hour problem.
I'll enable it on Router #2 now.
I'll enable it on Router #2 now.
Re: OSPF losing routes randomly
NBMA seems to solve the problem.
I've added only the border Neighbor to the Routers, and all the Routers to the Border. 2 hours so far with no problems or warnings, rock solid routing.
I've added only the border Neighbor to the Routers, and all the Routers to the Border. 2 hours so far with no problems or warnings, rock solid routing.
Re: OSPF losing routes randomly
It sounds like perhaps the ethernet switch is dropping some multicast traffic if switching to NBMA fixes the problem.
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StubArea51
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Re: OSPF losing routes randomly
My thoughts exactly which is why i suggested trying a different switch.It sounds like perhaps the ethernet switch is dropping some multicast traffic if switching to NBMA fixes the problem.
To the OP: Typically when NBMA solves your OSPF issues it means you've masked an underlying problem - most likely dropping multicast traffic for 224.0.0.5 & 224.0.0.6
Re: OSPF losing routes randomly
It's possible that the switch may have some broadcast/multicast storm control or limitation feature, and if the OSPF hellos are coming at times when there is enough multicast/broadcast traffic to trigger the limitations, that could be a possible source of the issue.
Re: OSPF losing routes randomly
netgear gray (not the blue line) switches have this feature and break things unless you disable the storm control features. took me a long time to track it down.
Re: OSPF losing routes randomly
Glad you solve the problem, useful info to know also.
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