Cisco wlc mac flappingwe are using WLC and 3502, also 3802i APs I can see Mac flapping log between two APs in serval sites but most sites are not my question is 1. what occasion does mac flapping happen? -> I guess it is wireless roaming 2. Mac flapping can happen in WLC environment? -> I guess Mac flap in WLC environment means Roaming is not properly workingThe Cisco Learning Network Store. Satisfy your craving to learn with up to 25% savings on select Cisco training products, March 14th, 8am PDT. Commands. The notification is based on a command which will be executed by the scheduler when the notification is issued. This command is attached to each contact to be notified. Centreon has default commands that you can modify. Go to the configuration commands chapter to edit / add new notification commands. You can also find in the Centreon ... Apr 20, 2021 · From Dashboard navigate to Configure > Access control. 2. Select MAC-based access control (no encryption) for Association requirements. 3. For Splash page choose None. Click through splash can be selected if desired. Select Cisco Identity Services Engine (ISE) Authentication if your setup uses the AVP Service Type - Call Check, otherwise the ... Cisco Networks Add-on. Contribute to inspired/TA-cisco_ios development by creating an account on GitHub. A MAC Flap is caused when a switch receives packets from two different interfaces with the same source MAC address. If you are getting the behaviour for a lot of other MACs, that most likely is a layer 2 loop. Check the network switches for misconfigurations that might cause a data-forwarding loop. If you aren't running spanning-tree, turn it on.Valentina, A MAC flap is detected, when a MAC address is learned on a new port within the 300-second CAM table refresh window. Normally in a properly configured network, that doesn't happen, because on Access layer switch, when you physically remove patch lead from one port and connect it to another, the original port goes to notconnected mode and all its MAC entries are purged instantly, so ... Symptom: -Mobility Traffic is being sent to a mac address terminated on "non zero" -this may cause mobility flapping on corner cases on VSS setups, for WLC without any Aps joines Conditions: Wism or 4400 Trigger is not clearWe're sorry but dummies doesn't work properly without JavaScript enabled. Please enable it to continue. But based on what he showed before, gi1/0/1 is the WLC. If the MACs are being seen from the WLC, that would indicate central switching of some sort (assuming these are client MAC addresses). If things are centrally switched across the board, the MACs should only ever be seen on WLC ports and flapping shouldn't occur. 1425 manning point roadAvailable Languages. Download Options. Book Title. Cisco Wireless Controller Configuration Guide, Release 7.5. PDF - Complete Book (17.98 MB) View with Adobe Reader on a variety of devices. Results. Updated: June 10, 2020.NO. PRINSIPAL PRODUSEN SUPPLIER PRONUTEC S.A.U; Parque Epresarial Boroa Parcela 2c-1 48340 Amorebieta Vizcaya-Spanyol CIRCUTOR, S.A; Vial Sant Jordi s/n 08232 we are using WLC and 3502, also 3802i APs I can see Mac flapping log between two APs in serval sites but most sites are not my question is 1. what occasion does mac flapping happen? -> I guess it is wireless roaming 2. Mac flapping can happen in WLC environment? -> I guess Mac flap in WLC environment means Roaming is not properly workingCisco Bug: CSCvk68688 - Client traffic seen on the 5508 Standby Hot WLC causing MAC flapping on switch. Last Modified . Nov 11, 2020. Products (1) Cisco 5500 Series Wireless Controllers ; Known Affected Releases . 8.3(140.0) Description (partial)Ran into a similar issue with Cisco WS-3850 switches connected to both Aruba and Aerohive systems. Wireless stations roamed between WAPs ( and because the director of IT didn't believe in site surveys, even stationary clients fast roamed ) and the switches threw errors and warnings about "MAC-ADDRESS-FLAP xxxx.xxxx.xxxx". NO. PRINSIPAL PRODUSEN SUPPLIER PRONUTEC S.A.U; Parque Epresarial Boroa Parcela 2c-1 48340 Amorebieta Vizcaya-Spanyol CIRCUTOR, S.A; Vial Sant Jordi s/n 08232 Nov 12, 2014 · In these cases if the RSSI received by the host is within the range that triggers a "roam" then the host will roam. Of course if the host doesn't move, the RSSI's don't change and the host could roam again. This looks like an "AP flap" and when it happens I sometimes see a mac-flap warning on the switch. But based on what he showed before, gi1/0/1 is the WLC. If the MACs are being seen from the WLC, that would indicate central switching of some sort (assuming these are client MAC addresses). If things are centrally switched across the board, the MACs should only ever be seen on WLC ports and flapping shouldn't occur. Dec 27, 2016 · On the CISCO command-line interface, there is the shutdown interface configuration command to disable an interface and the no shutdown command to enable it. I will show the examples of these commands, as well as how to check an interface status using the show interfaces status command. Cool Tip: There is nothing worse then trying to debug a ... May 09, 2012 · MAC flapping on WLC ports. I've been getting "%MAC_MOVE-SP-4-NOTIF: Host xx.xx.xx.xx.xx in vlan 123 is flapping between port Gi1/18 and port Po1" entries on my core switches. The topology looks like this: Interface Po1 connects my two 6500 core switches, we have HSRP running for each vlan on the the wireless network. what is doming resinCisco Public AireOS WLC Provisioning troubleshooting • Streaming Telemetry Failure -WLC shows “partial collection failure” in Last Sync Status • Check following items, 1. Check if WLC has right SNMP Read Only community name 2. MAC flapping on WLC ports. I've been getting "%MAC_MOVE-SP-4-NOTIF: Host xx.xx.xx.xx.xx in vlan 123 is flapping between port Gi1/18 and port Po1" entries on my core switches. The topology looks like this: Interface Po1 connects my two 6500 core switches, we have HSRP running for each vlan on the the wireless network.We're sorry but dummies doesn't work properly without JavaScript enabled. Please enable it to continue. Investigate Switch MAC Address Forwarding Table C. Verify Physical Layer Connectivity 1. Check Interface Status 2. Link Change and Port Errors 3. Verify IP Connectivity 4. Check for Unidirectional Link 5. Additional Physical Layer Troubleshooting References D. Layer 3 HSRP Debugging 1. Standard HSRP Debugging 2.Cisco Catalyst 9800 Series comprises next-generation wireless controllers (controller) built for intent-based networking. The Catalyst 9800 Series Wireless Controllers are Cisco IOS XE-based and integrate the radio frequency (RF) capabilities from Cisco Aironet with the intent-based networking capabilities of Cisco IOS XE to create a best-in-class wireless experience for your organization. Jul 31, 2019 · For subsequent Cisco IOS XE Denali 16.x.x, or Cisco IOS XE Everest 16.x.x, or Cisco IOS XE Fuji 16.x.x, or Cisco IOS XE Gibraltar 16.x.x releases, if there is a new bootloader in the release, it may be automatically upgraded based on the hardware version of the switch when you boot up your switch with the new image for the first time. Dec 27, 2016 · On the CISCO command-line interface, there is the shutdown interface configuration command to disable an interface and the no shutdown command to enable it. I will show the examples of these commands, as well as how to check an interface status using the show interfaces status command. Cool Tip: There is nothing worse then trying to debug a ... Hi all, I've been getting .Feb 23 10:59:50: %C4K_EBM-4-HOSTFLAPPING: Host 7C:E9:D3:9A:DC:99 in vlan 1 is flapping between port Gi3/2 and port Fa4/14 .Feb 23 11:00:01: %C4K_EBM-4-HOSTFLAPPING: Host B8:EE:65:71:55:12 in vlan 1 is flapping between port Fa4/14 and port Gi3/2 .Feb 23 11:01:14: %C4K_EBM-4...Investigate Switch MAC Address Forwarding Table C. Verify Physical Layer Connectivity 1. Check Interface Status 2. Link Change and Port Errors 3. Verify IP Connectivity 4. Check for Unidirectional Link 5. Additional Physical Layer Troubleshooting References D. Layer 3 HSRP Debugging 1. Standard HSRP Debugging 2.We're sorry but dummies doesn't work properly without JavaScript enabled. Please enable it to continue. Available Languages. Download Options. Book Title. Cisco Wireless Controller Configuration Guide, Release 7.5. PDF - Complete Book (17.98 MB) View with Adobe Reader on a variety of devices. Results. Updated: June 10, 2020.ipe 140 weightJun 19, 2018 · Jun 19 12:28:25.679: %MAC_MOVE-4-NOTIF: Host xxxxx in vlan xx is flapping between port Po71 and port Po25 Po71 is the Po that connects with the WLC in each side, and Po15 and Po25 are the interconnections between both sites. May 26, 2013 · Flapping events don't require ingress traffic alternating between ports -- a simple change from ingress of a MAC address on port A to port B on a switch quickly enough will cause a flapping event to be logged; for instance, a live migration of a virtual machine from one host to another will often cause a MAC flapping notification. @Derelict said in VLANs having same mac address causing flapping error on cisco switch: It is absolutely not a problem to have the same MAC address from a device on different VLANs on the same properly-configured switch port.Release Notes for Cisco Wireless Controllers and Lightweight Access Points, Cisco Wireless Release 8.8.120.0 and 8.8.125.0 -Release Notes: Release Notes for Cisco Wireless Controllers and Lightweight Access Points, Cisco Wireless Release 8.8.120.0 and 8.8.125.0Aug 09, 2012 · After that we experienced problems with flapping control and data paths. Our setup: 4 remote WLC, 1 centralized Anchor-WLC hosted in a DMZ. First of all, it´s important to understand that the etherchannel is always initiated by the host with the lowest MAC-Address. Jun 19, 2018 · Jun 19 12:28:25.679: %MAC_MOVE-4-NOTIF: Host xxxxx in vlan xx is flapping between port Po71 and port Po25 Po71 is the Po that connects with the WLC in each side, and Po15 and Po25 are the interconnections between both sites. Ran into a similar issue with Cisco WS-3850 switches connected to both Aruba and Aerohive systems. Wireless stations roamed between WAPs ( and because the director of IT didn't believe in site surveys, even stationary clients fast roamed ) and the switches threw errors and warnings about "MAC-ADDRESS-FLAP xxxx.xxxx.xxxx". Jul 31, 2019 · For subsequent Cisco IOS XE Denali 16.x.x, or Cisco IOS XE Everest 16.x.x, or Cisco IOS XE Fuji 16.x.x, or Cisco IOS XE Gibraltar 16.x.x releases, if there is a new bootloader in the release, it may be automatically upgraded based on the hardware version of the switch when you boot up your switch with the new image for the first time. apple music not working after updateNov 12, 2014 · In these cases if the RSSI received by the host is within the range that triggers a "roam" then the host will roam. Of course if the host doesn't move, the RSSI's don't change and the host could roam again. This looks like an "AP flap" and when it happens I sometimes see a mac-flap warning on the switch. Cisco Public AireOS WLC Provisioning troubleshooting • Streaming Telemetry Failure -WLC shows “partial collection failure” in Last Sync Status • Check following items, 1. Check if WLC has right SNMP Read Only community name 2. Symptom: Uni-cast flooding caused by Mesh AP 1520 in RAP mode. This can be detected as "mac flapping" seen on the switch were RAP(s) are connected to. Conditions: WLC 7.0.116.0. LAP152x in RAP mode.The MAC Flapping message basically says that your switch sees a MAC address at one port, and suddenly after that at another port. This is expected behavior with Instant APs as the client breaks out at the AP and appears to be moving from port to port while roaming. Do you have issues as well? Or is it just these messages?Anybody ever see flapping between 1 of your AP's and the controller? 1 controller connected to a single interface interface GigabitEthernet1/0/1 description Cisco WLC switchport trunk native vlan 100 switchport mode trunk load-interval 30 end 24 AP's. All interfaces configured the same way interface GigabitEthernet5/0/45 switchport access vlan 10w176 service menuThe Cisco Learning Network Store. Satisfy your craving to learn with up to 25% savings on select Cisco training products, March 14th, 8am PDT. Symptom: Uni-cast flooding caused by Mesh AP 1520 in RAP mode. This can be detected as "mac flapping" seen on the switch were RAP(s) are connected to. Conditions: WLC 7.0.116.0. LAP152x in RAP mode.Aug 09, 2012 · After that we experienced problems with flapping control and data paths. Our setup: 4 remote WLC, 1 centralized Anchor-WLC hosted in a DMZ. First of all, it´s important to understand that the etherchannel is always initiated by the host with the lowest MAC-Address. Cisco Public AireOS WLC Provisioning troubleshooting • Streaming Telemetry Failure -WLC shows “partial collection failure” in Last Sync Status • Check following items, 1. Check if WLC has right SNMP Read Only community name 2. Cisco Networks Add-on. Contribute to inspired/TA-cisco_ios development by creating an account on GitHub. Extreme Networks delivers end-to-end, cloud-driven networking solutions and top-rated services and support to advance our customers' digital transformation efforts and deliver progress like never before. May 26, 2013 · Flapping events don't require ingress traffic alternating between ports -- a simple change from ingress of a MAC address on port A to port B on a switch quickly enough will cause a flapping event to be logged; for instance, a live migration of a virtual machine from one host to another will often cause a MAC flapping notification. Anybody ever see flapping between 1 of your AP's and the controller? 1 controller connected to a single interface interface GigabitEthernet1/0/1 description Cisco WLC switchport trunk native vlan 100 switchport mode trunk load-interval 30 end 24 AP's. All interfaces configured the same way interface GigabitEthernet5/0/45 switchport access vlan 10Mac address flapping between C3750 - WLC 5508 we have coonection between c3750 and wlc 5508 and it shows that mac address flaps between two interfaces of c3750. %SW_MATM-4-MACFLAP_NOTIF: Host c417.fea9.bae5 in vlan 5 is flapping between port Gi1/0/3 and port Gi1/0/4Aug 09, 2012 · After that we experienced problems with flapping control and data paths. Our setup: 4 remote WLC, 1 centralized Anchor-WLC hosted in a DMZ. First of all, it´s important to understand that the etherchannel is always initiated by the host with the lowest MAC-Address. Dec 27, 2016 · On the CISCO command-line interface, there is the shutdown interface configuration command to disable an interface and the no shutdown command to enable it. I will show the examples of these commands, as well as how to check an interface status using the show interfaces status command. Cool Tip: There is nothing worse then trying to debug a ... @Derelict said in VLANs having same mac address causing flapping error on cisco switch: It is absolutely not a problem to have the same MAC address from a device on different VLANs on the same properly-configured switch port.Jun 19 12:28:25.679: %MAC_MOVE-4-NOTIF: Host xxxxx in vlan xx is flapping between port Po71 and port Po25 Po71 is the Po that connects with the WLC in each side, and Po15 and Po25 are the interconnections between both sites.Jul 31, 2019 · For subsequent Cisco IOS XE Denali 16.x.x, or Cisco IOS XE Everest 16.x.x, or Cisco IOS XE Fuji 16.x.x, or Cisco IOS XE Gibraltar 16.x.x releases, if there is a new bootloader in the release, it may be automatically upgraded based on the hardware version of the switch when you boot up your switch with the new image for the first time. @Derelict said in VLANs having same mac address causing flapping error on cisco switch: It is absolutely not a problem to have the same MAC address from a device on different VLANs on the same properly-configured switch port.Dec 24, 2012 · The frame is forwarded to the default port. b. The switch generates an ARP request for the address. c. The switch floods the frame out all ports (except the receiving port).--. d. The switch drops the frame. 5. In the Catalyst 6500, frames can be filtered with access lists for security and QoS. 02a vs 02jDec 27, 2016 · On the CISCO command-line interface, there is the shutdown interface configuration command to disable an interface and the no shutdown command to enable it. I will show the examples of these commands, as well as how to check an interface status using the show interfaces status command. Cool Tip: There is nothing worse then trying to debug a ... Apr 20, 2021 · From Dashboard navigate to Configure > Access control. 2. Select MAC-based access control (no encryption) for Association requirements. 3. For Splash page choose None. Click through splash can be selected if desired. Select Cisco Identity Services Engine (ISE) Authentication if your setup uses the AVP Service Type - Call Check, otherwise the ... 問題のMACアドレスはCisco MAC(ポートグループに割り当てられている可能性がありますか?)のようですが、所属するスイッチを物理的に見つけることができません。 DA: 37 PA: 2 MOZ Rank: 16. Host Flapping between ports fix? - Cisco Community cisco.com May 09, 2018 · Needs answer. I have a problem with my WLAN network, it's comprised of a Cisco 2500 WLC and 2702 AP’s. I hope this is the right forum because although the WLAN is Cisco, my Switches are HP. Scenario:- I have a Forklift terminal with an IP 10.1.10.200 connecting to an AP (IP - 10.1.15.100) all AP’s are managed by a WLC (IP- 10.1.15.250). Ran into a similar issue with Cisco WS-3850 switches connected to both Aruba and Aerohive systems. Wireless stations roamed between WAPs ( and because the director of IT didn't believe in site surveys, even stationary clients fast roamed ) and the switches threw errors and warnings about "MAC-ADDRESS-FLAP xxxx.xxxx.xxxx". Symptom: -Mobility Traffic is being sent to a mac address terminated on "non zero" -this may cause mobility flapping on corner cases on VSS setups, for WLC without any Aps joines Conditions: Wism or 4400 Trigger is not clearCisco Bug: CSCvk68688 - Client traffic seen on the 5508 Standby Hot WLC causing MAC flapping on switch. Last Modified . Nov 11, 2020. Products (1) Cisco 5500 Series Wireless Controllers ; Known Affected Releases . 8.3(140.0) Description (partial)Anybody ever see flapping between 1 of your AP's and the controller? 1 controller connected to a single interface interface GigabitEthernet1/0/1 description Cisco WLC switchport trunk native vlan 100 switchport mode trunk load-interval 30 end 24 AP's. All interfaces configured the same way interface GigabitEthernet5/0/45 switchport access vlan 10Ensure legacy crypto options are disabled for HTTPS Ensure CSRF protection is in place SSH Recommendations Secure SSH/Telnet Secure SSH High Crypto WLAN Security Recommendations Enable 802.11r Fast Transition DHCP Required Option Disable Aironet IE Client Exclusion Peer-to-peer Blocking Disable Local EAP WPA2 + 802.1X WLANFlapping events don't require ingress traffic alternating between ports -- a simple change from ingress of a MAC address on port A to port B on a switch quickly enough will cause a flapping event to be logged; for instance, a live migration of a virtual machine from one host to another will often cause a MAC flapping notification.Mac address flapping between C3750 - WLC 5508 we have coonection between c3750 and wlc 5508 and it shows that mac address flaps between two interfaces of c3750. %SW_MATM-4-MACFLAP_NOTIF: Host c417.fea9.bae5 in vlan 5 is flapping between port Gi1/0/3 and port Gi1/0/4rplidar a1 pinoutSymptom: -Mobility Traffic is being sent to a mac address terminated on "non zero" -this may cause mobility flapping on corner cases on VSS setups, for WLC without any Aps joines Conditions: Wism or 4400 Trigger is not clearWLC begins the MAC authentication process when it sends an authentication request to the ISE server configured. Step 3. Based on the authorization policy configured on ISE, the Access-Accept message is sent back to the WLC with the redirect URL and redirect Access Control List ( ACL) entries.May 09, 2012 · MAC flapping on WLC ports. I've been getting "%MAC_MOVE-SP-4-NOTIF: Host xx.xx.xx.xx.xx in vlan 123 is flapping between port Gi1/18 and port Po1" entries on my core switches. The topology looks like this: Interface Po1 connects my two 6500 core switches, we have HSRP running for each vlan on the the wireless network. NO. PRINSIPAL PRODUSEN SUPPLIER PRONUTEC S.A.U; Parque Epresarial Boroa Parcela 2c-1 48340 Amorebieta Vizcaya-Spanyol CIRCUTOR, S.A; Vial Sant Jordi s/n 08232 @Derelict said in VLANs having same mac address causing flapping error on cisco switch: It is absolutely not a problem to have the same MAC address from a device on different VLANs on the same properly-configured switch port.Jun 19, 2018 · Jun 19 12:28:25.679: %MAC_MOVE-4-NOTIF: Host xxxxx in vlan xx is flapping between port Po71 and port Po25 Po71 is the Po that connects with the WLC in each side, and Po15 and Po25 are the interconnections between both sites. Jan 14, 2016 · MAC and IP Address Configuration for an Extended Bridge Domain in Cisco ACI Fabric 1 Figure 50 shows the required bridge domain configuration for the IP and MAC addresses: Custom MAC Address: This is the physical MAC address associated with the SVI that is created on the Hi all, I've been getting .Feb 23 10:59:50: %C4K_EBM-4-HOSTFLAPPING: Host 7C:E9:D3:9A:DC:99 in vlan 1 is flapping between port Gi3/2 and port Fa4/14 .Feb 23 11:00:01: %C4K_EBM-4-HOSTFLAPPING: Host B8:EE:65:71:55:12 in vlan 1 is flapping between port Fa4/14 and port Gi3/2 .Feb 23 11:01:14: %C4K_EBM-4...We're sorry but dummies doesn't work properly without JavaScript enabled. Please enable it to continue. renault megane start stop controlerenMAC flapping on WLC ports. I've been getting "%MAC_MOVE-SP-4-NOTIF: Host xx.xx.xx.xx.xx in vlan 123 is flapping between port Gi1/18 and port Po1" entries on my core switches. The topology looks like this: Interface Po1 connects my two 6500 core switches, we have HSRP running for each vlan on the the wireless network.The Cisco Learning Network Store. Satisfy your craving to learn with up to 25% savings on select Cisco training products, March 14th, 8am PDT. Available Languages. Download Options. Book Title. Cisco Wireless Controller Configuration Guide, Release 7.5. PDF - Complete Book (17.98 MB) View with Adobe Reader on a variety of devices. Results. Updated: June 10, 2020.Mobility Express uses MAC 00-00-5E-00-01-VRID where VRID is 1 so if there are other instances of VRRP running in the environment, use VRID other than 1 for those instances. Master AP Failover and Electing a New Master . Beginning Cisco Wireless Release 8.8, when a VRRP MAC conflict is detected, you can change the VRID on the master AP.Ensure legacy crypto options are disabled for HTTPS Ensure CSRF protection is in place SSH Recommendations Secure SSH/Telnet Secure SSH High Crypto WLAN Security Recommendations Enable 802.11r Fast Transition DHCP Required Option Disable Aironet IE Client Exclusion Peer-to-peer Blocking Disable Local EAP WPA2 + 802.1X WLANCCNA 200-301 Portable Command Guide, 5th Edition. by Scott D. Empson. Released December 2019. Publisher (s): Cisco Press. ISBN: 9780135937907. Explore a preview version of CCNA 200-301 Portable Command Guide, 5th Edition right now. O’Reilly members get unlimited access to live online training experiences, plus books, videos, and digital ... Symptom: Uni-cast flooding caused by Mesh AP 1520 in RAP mode. This can be detected as "mac flapping" seen on the switch were RAP(s) are connected to. Conditions: WLC 7.0.116.0. LAP152x in RAP mode.Commands. The notification is based on a command which will be executed by the scheduler when the notification is issued. This command is attached to each contact to be notified. Centreon has default commands that you can modify. Go to the configuration commands chapter to edit / add new notification commands. You can also find in the Centreon ... A MAC Flap is caused when a switch receives packets from two different interfaces with the same source MAC address. If you are getting the behaviour for a lot of other MACs, that most likely is a layer 2 loop. Check the network switches for misconfigurations that might cause a data-forwarding loop. If you aren't running spanning-tree, turn it on.in your case ap and wlc is located in same place because of which you have looping/mac flapping (when you receive packets from two different interfaces with the same source mac address), the solution would be either you change the ap in local mode, create ap group and place that ap in the group and select the ssids whichever you would like to …May 09, 2018 · Needs answer. I have a problem with my WLAN network, it's comprised of a Cisco 2500 WLC and 2702 AP’s. I hope this is the right forum because although the WLAN is Cisco, my Switches are HP. Scenario:- I have a Forklift terminal with an IP 10.1.10.200 connecting to an AP (IP - 10.1.15.100) all AP’s are managed by a WLC (IP- 10.1.15.250). @Derelict said in VLANs having same mac address causing flapping error on cisco switch: It is absolutely not a problem to have the same MAC address from a device on different VLANs on the same properly-configured switch port.Jun 19 12:28:25.679: %MAC_MOVE-4-NOTIF: Host xxxxx in vlan xx is flapping between port Po71 and port Po25 Po71 is the Po that connects with the WLC in each side, and Po15 and Po25 are the interconnections between both sites.1988 nickel valueMac address flapping between C3750 - WLC 5508 we have coonection between c3750 and wlc 5508 and it shows that mac address flaps between two interfaces of c3750. %SW_MATM-4-MACFLAP_NOTIF: Host c417.fea9.bae5 in vlan 5 is flapping between port Gi1/0/3 and port Gi1/0/4A MAC Flap is caused when a switch receives packets from two different interfaces with the same source MAC address. If you are getting the behaviour for a lot of other MACs, that most likely is a layer 2 loop. Check the network switches for misconfigurations that might cause a data-forwarding loop. If you aren't running spanning-tree, turn it on.NO. PRINSIPAL PRODUSEN SUPPLIER PRONUTEC S.A.U; Parque Epresarial Boroa Parcela 2c-1 48340 Amorebieta Vizcaya-Spanyol CIRCUTOR, S.A; Vial Sant Jordi s/n 08232 A MAC Flap is caused when a switch receives packets from two different interfaces with the same source MAC address. If you are getting the behaviour for a lot of other MACs, that most likely is a layer 2 loop. Check the network switches for misconfigurations that might cause a data-forwarding loop. If you aren't running spanning-tree, turn it on.Mac address flapping between C3750 - WLC 5508 we have coonection between c3750 and wlc 5508 and it shows that mac address flaps between two interfaces of c3750. %SW_MATM-4-MACFLAP_NOTIF: Host c417.fea9.bae5 in vlan 5 is flapping between port Gi1/0/3 and port Gi1/0/4NO. PRINSIPAL PRODUSEN SUPPLIER PRONUTEC S.A.U; Parque Epresarial Boroa Parcela 2c-1 48340 Amorebieta Vizcaya-Spanyol CIRCUTOR, S.A; Vial Sant Jordi s/n 08232 we are using WLC and 3502, also 3802i APs I can see Mac flapping log between two APs in serval sites but most sites are not my question is 1. what occasion does mac flapping happen? -> I guess it is wireless roaming 2. Mac flapping can happen in WLC environment? -> I guess Mac flap in WLC environment means Roaming is not properly workingAug 09, 2012 · After that we experienced problems with flapping control and data paths. Our setup: 4 remote WLC, 1 centralized Anchor-WLC hosted in a DMZ. First of all, it´s important to understand that the etherchannel is always initiated by the host with the lowest MAC-Address. Cisco Bug: CSCtz16343 - MAC flapping during Layer 2 Roam on Salt and Pepper WLC deployment. Last Modified . Dec 19, 2018. Products (1) Cisco 5500 Series Wireless Controllers ; Known Affected Releases . 7.0(98.218) Description (partial) Symptom:Switches report MAC flapping during layer 2 roaming by client within a salt and pepper, ...laravel insert if not exists -fc