Flapping on Cisco switch in a Ruckus WiFi solution

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  • Updated 7 months ago
Hi

I have a wifi solution with ruckus, controller 1100 and 47 AP ́s. The ap ́s are disconnecting randomly because of some switch ́s ports are up and down constantly.
The wired network is ok and certified,
But there are many logs registered refers to flapping on the switch.
I have disabled the mesh option on the zonedirector. The processor load on the switch has been decreased after that. But the issue keeps alive.

Could it be related with the cisco switch arp table refresh time?
Is it necessary to get similir time of refresh
Or, What could be the problem?
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Alejandro Mendez

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Posted 3 years ago

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Mat Murdock

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What model of switch are you using?

Mat
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Alejandro Mendez

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We are using 2960S 24 ports and 48 ports
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Mat Murdock

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Are the AP's turning off and on? Check their uptime.

Mat
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Alejandro Mendez

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The AP ́s are on since the last manual reboot. they look ok
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Mat Murdock

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Are you using trunk / tagged ports and are you using both network ports on your AP?
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Monnat Systems, AlphaDog

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Hello Alejandro Mendez,

I would look at following:

1. Switch port configuration

2. AP support file to see if it is network disconnect or AP reboots. You can also check in ZD events and activities to see if its a specific AP(s) or specific segment of network.

3. Check AP ports too.

4. Also read this - May be applicable to yours --> https://forums.ruckuswireless.com/ruc...

hope this helps.
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Bill Burns, AlphaDog

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Alejandro:

The link from Monnat refers to spanning tree issues on switches.

It may be helpful/informative to run the following command on your cisco switch(es):
show spanning-tree detail | begin last

The first line should show you the last time a spanning-tree topology event took place. (for your first VLAN)
The second line should tell you what port the spanning-tree BPDU packet (that caused the event) came in on.

If you have multiple VLANS, you can then type "/" and return to see the same information for the next VLAN. (and the next, etc.)
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Bill Burns, AlphaDog

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Also...
Do the switch logs refer to "mac" flapping?
If so, this message could result from wifi devices roaming rapidly between different APs.
(so the switch sees the same mac coming from different places)

You may want to check Ruckus logs to see if you have excessive roaming going on.
..and it may help to syslog this information to an external (linux?) machine in order to capture/store logs for further analysis.
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Alejandro Mendez

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Yes, the switch logs show many mac flapping lines.
The solution is a high density design. So, we use some AP to make load balancing of users. Many of them are roaming. The logs on ZD show many roaming lines.

But, I think, the spanning tree on switch have to run very fast, because, I guess it is made to wired network times (faster than wireless network).
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Bill Burns, AlphaDog

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Do you have mesh features enabled?
If not, and all you're seeing is a lot of mac flapping log entries on your switches, it's likely that you have an issue w/ wifi clients rapidly roaming. (as opposed to a spanning-tree issue)

I just posted this "best practice configs for a high density deployment" question.
https://forums.ruckuswireless.com/ruc...

See if that helps you.
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Alejandro Mendez

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The mesh features are disable.

Hi Bill. Thanks by the suggestions in best practice.... post.

I will test it. But, I have a question:
How to run steps 2,3 and 4 (ofdm-only, bss-minrate, smart-roam). (on AP CLI or ZD CLI?)
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Bill Burns, AlphaDog

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I added another post explaining how to get to the ZoneDirector CLI to enter the proposed "Best Practice" config.
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Rahul Koul, Employee

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Hi Alejandro,

As Bill said MAC Flap is because of the clients roaming quite frequently which is causing the client MAC to be learnt via more than one AP.

I would like to also mention that there was a known issue on version 9.6.1 which might be what you are having too. Check this out:

https://support.ruckuswireless.com/an...

I would suggest having the ZD on version 9.7.2.0.9 as that is a recommended version and also the bug fix is present in it.

Cheers,
Rahul
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Belova Alesya

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Hi everyone here!
I have same trouble now (in switch's logs I see that port is flapping (up-down) but AP doesn't reboot))
"best practice configs for a high density deployment " didn't help me
How this trouble had solved by you?
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Belova Alesya

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Cisco have bug CSCus35889 with this symptomes. maybe it will be helpful for somebody