About yum3372

yum3372 · 01-20-2026

Hi Guys,We recently replaced our APs to C9120 model, and they are joined to C9800 WLC. However some old clients who have WiFi 3 WLAN card are having issue, they lost wireless connection for a second and re-connected automatically. This issue happends...

yum3372 · 04-15-2025

Hi guys!I'm back carrying weird issue with my WLC and AP! Today morning, I saw some weird logs on my core switch.A lot of MAC address flapping log written there especially between AP and WLC. All my AP is joined WLC, most AP are 3700, 3800 or 9120. W...

yum3372 · 03-27-2025

Hi All, I have issue on my voice gateway, below logs are being written since yesterday. and E1 controller has orange light on its 0/0/1. What's the problem on it? Please help!!000541: Mar 27 15:52:54.988: %CONTROLLER-5-UPDOWN: Controller E1 0/0/1, ch...

yum3372 · 02-27-2025

Hi guys,I have experienced weird issue these days. I have 9300 switch on my network and 1783-BMS20CL switch from allen bradely.weird thing is that a specific MAC is showing on 2 different ports. that MAC actually should be on port 19, because it's co...

yum3372 · 02-16-2025

Weird symptom...I have some switches in my network. and this weird symptom came to me last week. specific vlan(1145) is in my network and I can ping any of IP in that vlan normaly. but when if I bounce a specific interface on my 9300 switch, then I c...

yum3372 · 04-18-2025

I just checked my WLC and it has the vlans for WLAN(11,15)... Damm! Could it be the root cause of the problem? right?And I just found out how to set up the flex profile on WLC as below. Do you think I need to change the set up for the SSID and everyt...

yum3372 · 04-15-2025

No. only 2 vlans (11,15) are in my network for wireless. and their SSID are configured for flex only.

yum3372 · 04-15-2025

Not sure what you meant, I have 2 vlans for wireless (vlan11, 15), and WLC also have these vlans because they are used for WLAN. do I not need vlan 11,15 in WLC? if all AP are running in flex? I just want to know why some client MAC addresses intermi...

yum3372 · 03-27-2025

Thanks for your answer!! I actually inquired ISP with this issue and they replaced some parts of their equipment connecting to my voice gateway. and it's been resolved since then. it was ISP equipment problem.

yum3372 · 03-03-2025

@liviu.gheorghe M02@rt37 Let me share the network topology. Please check out the attachment.And the switch 1783-BMS20CL is running mstp. let me add output of sh spanning-tree from it. sh spanning-treeMST0Spanning tree enabled protocol mstpRoot ID Pr...

Member Since	‎07-18-2023 12:53 AM
Date Last Visited	‎01-20-2026 10:53 PM
Posts	36
Total Helpful Votes Received	1

User Statistics

User Activity

Wireless instability between C9120 and client WiFi3(802.11g)

MAC address flapping between AP and WLC(9800)?

Cisco voice gateway E1 RAI, AIS, LOF detected?

Same MAC address showing on 2 different ports.

Ping loss on specific vlan when specific interface is bounced

Re: MAC address flapping between AP and WLC(9800)?

Re: MAC address flapping between AP and WLC(9800)?

Re: MAC address flapping between AP and WLC(9800)?

Re: Cisco voice gateway E1 RAI, AIS, LOF detected?

Re: Same MAC address showing on 2 different ports.