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saahil
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Help - MPLS/VPLS flapping

Tue Jul 13, 2021 10:50 am

Hi Support, I have been goin through the forum for some time but have not been able to solve this problem.

Any assistance or guidance will be appreciated.

We have network with 1 core router [1072] and multiple CCR-1009 routers deployed at sites which does the OSPF routing and MPLS/VPLS for pppoe users.

OSPF we are using PTP from 1072.

The OSPF routers are connected to CSS326 switches with vlans for pppoe users. Problem is at the PPPOE Server Router [1036] all VPLS links flap randomly together. It drops for 3-5 seconds and then all users get connected. But causing packet drops to customers and inconvinience if on calls or IPTV.

I have also gone through the forum and modified the mtu configs, but there is no change.. every hour 3-4 times it flaps.

Attached is the diagram, if someone can shed some light.
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IPANetEngineer
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Re: Help - MPLS/VPLS flapping

Tue Jul 13, 2021 4:38 pm

Three things to check for flapping VPLS

1. Duplication of MAC addresses on VPLS interfaces from copy/paste
2. Loop Detect is set on some or all routers - disable it
3. Bridging loop in one or more VPLS instances
 
saahil
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Re: Help - MPLS/VPLS flapping

Thu Jul 15, 2021 8:55 pm

Thank you for your prompt response. I check all your suggestions and disabled loop protection on all physical & vlan interfaces connected to the OSPF routers and VPLS.

But it’s still flapping. All our routers are on OS 6.44.6? Do you recommend we upgrade or downgrade?

Because every 50-60 mins all VPLS links drop 5-8 timeouts and then reconnects, where all the physical routers are connected on fiber with no packet loss.
 
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Re: Help - MPLS/VPLS flapping

Thu Jul 15, 2021 10:23 pm

The latest long term version (6.47.10) is stable and contains a number of OSPF and MPLS bug fixes since the 6.44 series.

That's what we typically put on client networks.
 
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feranmi
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Re: Help - MPLS/VPLS flapping

Fri Jul 30, 2021 7:06 pm

which platform are you using to connect the remote sites to your core-is it RF or fibre? If it is RF that is a 5Ghz-based, do check the quality of the link.
 
BluegrassBB
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Re: Help - MPLS/VPLS flapping

Tue Oct 04, 2022 4:56 am

Hi,
I'm having a similar issue if it's not the same.

Was a resolution ever found?
 
miasharmse84
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Re: Help - MPLS/VPLS flapping

Mon Oct 24, 2022 11:26 am

Perhaps good idea to start by confirm that the OSPF network is stable, run a continuous ping on the OSPF network and see if ping drops when the VPLS tunnels are flapping.
 
DonnieDarko777
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Re: Help - MPLS/VPLS flapping

Wed Nov 02, 2022 5:39 pm

upgrade at 6.48.6 look vpls forwarding table when drop connection
 
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nichky
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Re: Help - MPLS/VPLS flapping

Thu Nov 03, 2022 6:06 am

one more thing u can try to detect the issue.
Do tracert (once u experiencing drop) to the remote ip-add (loop) in the vpls.

Check the path , make sure it goes right direction, sometimes can be routed to the end users, and may cost the issue.
 
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nichky
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Re: Help - MPLS/VPLS flapping

Thu Nov 03, 2022 6:48 am

@IPANetEngineer
what do u mean by that?

Bridging loop in one or more VPLS instances

more than one vpls to the one end point, is that right?

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