topic Re: Loop network throught Repeater wifi device in Wireless

Loop network throught Repeater wifi device

dungdao251298 — Wed, 30 Nov 2022 02:56:29 GMT

Hello everybody,

I've issues. Cisco switch can't detection loop from repeater wifi device although I turned STP, Loopback Detection, Storm Control but it not working. Someone can help me ?

Re: Loop network throught Repeater wifi device

Mark Elsen — Wed, 30 Nov 2022 07:08:59 GMT

- The network doesn't have any looping segments at first glance (and or is loop-free), how is this observed ?

Re: Loop network throught Repeater wifi device

dungdao251298 — Wed, 30 Nov 2022 07:35:52 GMT

I intentionally made a loop at Repeater wifi device and cisco switch can't detection that.

Re: Loop network throught Repeater wifi device

Mark Elsen — Wed, 30 Nov 2022 09:06:21 GMT

>...and cisco switch can't detection that.
That depends , and or meaning it depends on the global switch configuration and the configuration of the port the access point is on (for instance). Also access point and repeater could have incorrect configuration directives.

Re: Loop network throught Repeater wifi device

dungdao251298 — Wed, 30 Nov 2022 10:26:36 GMT

Do mean that the cisco switch does not understand the LOOP PACKAGE from the wifi device? Do I need to configure both the cisco switch and the wifi device, right?

Re: Loop network throught Repeater wifi device

Mark Elsen — Wed, 30 Nov 2022 12:16:24 GMT

- What do you mean by 'loop package' ? Can you show an example of such a package ? Also check and or show logs from the switch when the loop is observed.

Re: Loop network throught Repeater wifi device

tobies — Wed, 30 Nov 2022 13:28:30 GMT

So, your "Repeater device" is what kind of device actually? Is it a wireless router/bridge with an integrated switch? And you used a network cable to bridge two ports of that integrated switch? If so, THERE needs to be the loop detection of any sort (STP/RSTP …).

Re: Loop network throught Repeater wifi device

dungdao251298 — Wed, 30 Nov 2022 14:08:17 GMT

That right!

as I said above. I used STP, Loopback Detection, Storm Control on Cisco Switch but it doesn't working. You have new idea ?

Re: Loop network throught Repeater wifi device

Mark Elsen — Wed, 30 Nov 2022 17:41:12 GMT

- Provide logs from switch , access point and repeater (if possible)

Re: Loop network throught Repeater wifi device

tobies — Wed, 30 Nov 2022 21:00:46 GMT

Yes, you said you enabled STP on the cisco switch (red arrow).

But if I understand you right, there's also some kind of integrated(?) switch on the repeater device (green arrow). Is that correct? If so, I'm suspecting you need to enable STP there as well.

Re: Loop network throught Repeater wifi device

Haydn Andrews — Wed, 30 Nov 2022 21:54:16 GMT

take a look at Cisco WGB or Cisco Mesh P2P guides for how this should be configured

Re: Loop network throught Repeater wifi device

dungdao251298 — Thu, 01 Dec 2022 04:20:29 GMT

This is cisco switch log:

File Logging: Level debug. File Messages: 53 Logged, 53 Dropped.
01-Dec-2022 11:18:22 %COPY-I-FILECPY: Files Copy - source URL flash://logging destination URL HTTP://172.16.1.106/
01-Dec-2022 11:17:53 %AAA-I-CONNECT: New http connection for user cisco, source 172.16.1.106 destination 172.16.0.215 ACCEPTED
01-Dec-2022 11:17:31 %UDLD-E-MALFORMED_TLV: UDLD message from cached with illegal tlv. UDLD parsing error: errorIllegalChecksum. mac 144d67cd49f8 , aggregated (3643)
01-Dec-2022 11:17:11 %UDLD-E-MALFORMED_TLV: UDLD message from cached with illegal tlv. UDLD parsing error: errorIllegalChecksum. mac 144d67cd49f8
01-Dec-2022 11:17:11 %AAA-I-DISCONNECT: http connection for user cisco, source 172.16.1.106 destination 172.16.0.215 TERMINATED
01-Dec-2022 11:17:11 %UDLD-E-MALFORMED_TLV: UDLD message from cached with illegal tlv. UDLD parsing error: errorIllegalChecksum. mac 144d67cd49f8 , aggregated (12618)
01-Dec-2022 11:12:49 %UDLD-E-MALFORMED_TLV: UDLD message from cached with illegal tlv. UDLD parsing error: errorIllegalChecksum. mac 144d67cd49f8
01-Dec-2022 11:12:49 %UDLD-E-MALFORMED_TLV: UDLD message from cached with illegal tlv. UDLD parsing error: errorIllegalChecksum. mac 144d67cd49f8 , aggregated (8827)
01-Dec-2022 11:07:49 %UDLD-E-MALFORMED_TLV: UDLD message from cached with illegal tlv. UDLD parsing error: errorIllegalChecksum. mac 144d67cd49f8
01-Dec-2022 11:07:09 %COPY-N-TRAP: The copy operation was completed successfully, aggregated (1)
01-Dec-2022 11:07:09 %COPY-I-FILECPY: Files Copy - source URL flash://logging destination URL HTTP://172.16.1.106/
01-Dec-2022 11:04:23 %COPY-N-TRAP: The copy operation was completed successfully
01-Dec-2022 11:04:19 %COPY-I-FILECPY: Files Copy - source URL running-config destination URL flash://startup-config
01-Dec-2022 11:04:13 %SYSLOG-N-LOGGINGFILE: configure file logging level to 7.

Re: Loop network throught Repeater wifi device

Arshad Safrulla — Thu, 01 Dec 2022 05:10:16 GMT

I would start by checking whether the UDLD is enabled on the AP facing ports, if yes I would disable them first. Then I would check whether the switch CPU/memory utilization is high, if yes please take an output of show tech from the switch and open a TAC case for further analysis, you may also analyze the output via Cisco CLI Analyzer application.

I would also recommend that you run the latest Cisco TAC recommended code in the switch.

You have also not mentioned how the Mesh AP facing switchports are configured (Trunk or Access) This is somewhat mandatory if you want us to provide recommendations. It would be great if you can past the switchport configuration from both sides and tell us how the mesh link is configured (to carry dot1q or no)

Re: Loop network throught Repeater wifi device

dungdao251298 — Thu, 01 Dec 2022 07:31:31 GMT

Thank for your idea, but if Repeater wifi is attacker.

In my case, wifi device and repeater wifi device haven't stp or something method prevent it.