Cisco Wireless :: Etherchannels Flapping / Stacked 3750 To WLC5508?

Feb 18, 2013

We're running two 5508 WLCs running 7.0.235.3 pushing out 7 WLANs.  They are both live.  Each WLC is connected to the same stack of 3750G running 12.2(44)SE6 via Etherchannels.I'm getting tons of MAC flapping errors similar to this:9373213: Feb 19 10:53:54.564 CST: %SW_MATM-4-MACFLAP_NOTIF: Host 843a.4b3c.4cec in vlan 752 is flapping between port Po12 and port Po11Each portchannel consists of ports on each of the two switches in the 3750 stack.  Only VLAN 752 shows the flapping activity. LAG is enabled on the each of the WLCs.  The portchannel and interface configs are identical, minus the channel-group command of course.Maybe completely unrelated....looking at CDP neighbors from the switch is incorrect:

WLC1             Gig 2/0/44        157            H       AIR-CT550 Gig 0/0/1
WLC1             Gig 1/0/21        157            H       AIR-CT550 Gig 0/0/2
WLC1             Gig 1/0/20        157            H       AIR-CT550 Gig 0/0/3

[code].....

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WS-C3750G-48PS
WS-C3750G-48TSWS-C3750G-48TSWS-C3750G-48TS

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Jul 16, 2012

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Jun 3, 2013

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Cisco Switching/Routing :: 3750 - VLAN Flapping Error Message

Sep 15, 2012

I recently upgraded my network to have two 3750x core, one interface on the Cisco is connecting to a Net gear switch via a fiber converter. I am keep getting the vlan flapping error message in my log as below.
 
003396: Sep 17 01:46:16.328: %SW_MATM-4-MACFLAP_NOTIF: Host 5c0e.8ba7.0a5c in vlan 2 is flapping between port Gi2/0/15 and port Gi2/0/13
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[Code] .....
 
After my research i think this is a looping issue but I'm unsure how to address it.

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Cisco Switching/Routing :: Error Message Ports Flapping On 3750 Stack

Aug 27, 2012

I am receiving the following error message on a Cisco 3750 switch stack. Need troubleshooting this error message.

00:03:13: %SW_MATM-4-MACFLAP_NOTIF: Host 00d0.7400.2730 in vlan 600 is flapping between port Gi2/0/3 and port Gi2/0/2

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Cisco Switching/Routing :: 3750 Stack To Upstream ISP Separate Switches - MAC Flapping

Mar 11, 2012

I have an issue with a Cisco 3750 switch stack which is connected to two seperate upstream Cisco 3750's which are administered by an ISP.  The ISP is experiencing MAC address flapping from one of my VLAN SVI's i am using to route traffic upstream
 
[code]...
 
As you can see I utilise a VLAN SVI to route traffic to the upstream 1.1.1.2 (illustration only) IP.  As per the diagram of the topology attached, the ISP is receiving a MAC address flapping error confirming the SVI MAC address from my switch stack is being learnt on the trunk port connecting switch 1 and switch 2, and also the port (Gi1/0/48) directly connected to my switch stack. As these are all Layer 2 links essentially being passed upstream and then connected between the two ISP switches, we have a 3 way triangular loop formed.
 
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May 11, 2011

We are designing a LAN Network for ourselves.The proposed design is as follows:
 
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how many etherchannels can the 2960S support when it is stacked? I understand it initially has 6 channels.

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Cisco Wireless :: Mac Address Flapping Between C3750 / WLC 5508

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we have coonection between c3750 and wlc 5508 and it shows that mac address flaps between two interfaces of c3750. [code] two ports are trunking and one port is for management purposes and the other port is for the all other vlans. But it shows that it flaps always. And i think WLC uses one mac address for all device and not for port specific and that causes problem.

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Cisco Wireless :: WLC5508 - Client Cannot Get IP From Ex DHCP

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I have a WLC5508 , we are using external DHCP for WLANs
 
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This is debug
 
*DHCP Socket Task: Feb 05 21:26:43.106: e8:06:88:9b:a8:04 DHCP received op BOOTREQUEST (1) (len 308,vlan 1, port 1, encap 0xec03)
*DHCP Socket Task: Feb 05 21:26:43.106: e8:06:88:9b:a8:04 DHCP processing DHCP

[Code].....

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