Vlan flapping between trunk port. You are going to hop to a different vlan.

Vlan flapping between trunk port 1d: %SW_MATM-4-MACFLAP_NOTIF: Host 000c. The core switch, located on Floor A, is connected to the access switches on Floors B and C through fiber optic connections. Host 0cd7. Solved! Go to solution. 163 UTC: %SW_MATM-4-MACFLAP_NOTIF: Host 000a. no mls qos channel-consistency! interface TenGigabitEthernet1/6/1. I see ports flapping on both switches. Today we add only necessary vlans Switch#show platform pm interface-flaps tenGigabitEthernet 2/0/1 Field AdminFields OperFields ===== Access Mode Static Static Access Vlan Id 1 0 Voice Vlan Id 4096 0 VLAN Unassigned 0 ExAccess Vlan Id 32767 Native Vlan Id 1 Port Mode dynamic access Encapsulation 802. switchport mode trunk. xx. 38fa in vlan 70 is flapping between port Gi0/20 and port Po1 . The issue that we are experiencing is flapping between ports on all switches. Can wifi AP’s cause the MAC flapping? (Seen one occurance between a TRUNK port and an AP. There's one AP connected to the switch using an Etherchannel, and the config is like this: Switch#show run int We would like to know best approach to reduce VLAN traffic on our network. Port Mode Encapsulation Status Native vlan Po1 on 802. Host 000c. sh running-config interface Gi1/0/51 Building configuration %SW_MATM-4-MACFLAP_NOTIF: Host a44e. Both ports are configured as 'trunk' mode. 20ce in vlan 10 is flapping between port Gi2/0/47 and port Gi1/0/1 . Like Liked Unlike Reply. 302 CST: %SW_MATM-4-MACFLAP_NOTIF: Host 0cc4. This is a Netlab POD setup I’ve encountered a perplexing issue in our network setup that involves MAC address flapping!! There are three floors (A, B, and C) each equipped with access switches. e800. Port Vlans allowed on trunk. I tried to change cable and hard code speed to match printer setting. 11q on gi0/23 on each switch. 982a. switchport trunk native vlan 10. The switch decides to forward it from all ports having VLAN ID 10. 24 AP's. Senthilkumar. I’m really looking for some guidance around. 000737: Jul 18 10:52:38. I know a lot of people configure AP switch ports as a trunk with the native vlan set to the management vlan. 1. VLAN0014 The Office has a switch stack with redundant routers and a single trunk port connecting a single 2960 switch in the Warehouse. HYG the config::: interface Ethernet1/9 description VPC KEEPALIVE switchport access vlan 123 speed 1000! interface port-channel1 description vPC-PeerLink switchport mode trunk no lacp the 3850 stack is connected with two trunk interfaces, as a port-channel. 0/24) for VOICE. Thanks! Matt. I currently have one trunk port with a router on th Because STP doesn't run on PRP interfaces, one has to ensure that VLANs being sent to a PRP do not transit over the ISL/Dot1Q Trunk between the Switches/Redboxes. switchport trunk allowed vlan 3,5,32. xxxx in vlan x is flapping between port (1) and port (2)" In this example, the MAC address xxxx. Host 5894. Sh mac-address-table address MACADDRESS continues to show me the PO3 or PO15 as the interface location. Click Save. What could have been the possible reason for MAC Host 02a0. I am running 8. Thank you for all the good suggestions! I swapped the cable and disabled trunk negotiation on both sides, but the flapping keeps happening. Oct 2 DATA % C4K-EBM-4-HOST FLAPPING: HOST MACADDRESS in vlan 8 is flapping between port PO3 and port PO15. I have found that message in the cisco siwtch log,%SW_MATM-4-MACFLAP_NOTIF: Host 0010. Vlan 21 dùng cho Wireless Cái Ping times out. c1c1. 402a in vlan 2 is flapping between port Po2 and port Po3 T Why would we have ports go to non trunks after a loop? Our trunks are setup statically with a "switchport mode trunk". 643 IST: %SW_MATM-4-MACFLAP_NOTIF: Host 2816. Please don't forget to rate any posts that have been helpful. But at the same time I think (not sure) vm can access vlan traffic. I have connected cisco 3560 to two moxa switches on these ports 0/8 and 0/9 with Moxa switches connected as end of turb Solved: This should be a very basic fix, but I can't seem to find the answer. Port Vlans in spanning tree forwarding state and not pruned. 0131 in vlan 310 is flapping between port Po10 and port Po20 . Recording server is connected to port gig 1/0/40 (access vlan 105) on both Core switches, shows the below continuous flapping Apr 5 13:52:37: %SW_MATM-4-MACFLAP_NOTIF: Host 98f2. Because STP doesn't run on PRP interfaces, one has to ensure that VLANs being sent to a PRP do not transit over the ISL/Dot1Q Trunk between the Switches/Redboxes. Can the dumb switches be causing it (Seen occurance between a Trunk and small switchport trunk allowed vlan 1,10,100-103,105,106,108,112,116,120,301 switchport mode trunk mls qos trust dscp channel-group 1 mode active end. 4b68 in vlan 1 is flapping between port Gi0/1 and port Po1 18:04:44. Port flapping, also known as link flapping, causes a switch port's state to fluctuate between up and down within concise periods of time. 1q trunking 1. switchport trunk allowed vlan 2-4094. Mark as New; Bookmark; an issue as you leave yourself open to trunks being formed when you don’t wish for to be- hence manually forcing your trunks ports to be Hello. 00 storm-control action trap! interface The port flapping persists on all switches I have not yet upgraded but has completely stopped on all upgraded switches. a6c1 in vlan 2 They only know issue that I can share with you is that on HP switches, you have to manually TAG all the vlans to a 802. Thanks. Expand Post. I have Vlan 100. We have port 23 of the 24 port trunked to port 16 of the 16 port. description " Connected to Switch 1/2 Port g1 3,5 "switchport trunk encapsulation dot1q. vlan 1 is flapping between port mgerguis. e this is the configuration on the ports for all the Aruba APs. de81. 010a in vlan 10 is flapping between port Gi0/7 and port Gi0/1. Hi all, For a few days I have been observing vlan1 to be flapping between 2 ports of two 3750E switches (2 ports on each switch) which are cross connected to each other. The port 1 belongs to VLAN 10. xxxx in vlan 108 is flapping between port Po1 and port Gi2/0/11. 2(25). 4588 in vlan 12 is flapping between port Fa2/0/11 and port Fa2/0/12 . The problem is, on stack 03 logs of MAC flapping. conf t. Step 5. 168. None of these have been put on the port channel interface. /5 switchport trunk encapsulation dot1q channel-group 3 mode auto ! interface GigabitEthernet0/6 switchport trunk encapsulation dot1q channel-group 3 mode auto. Each WLC connects to the switch with 3 ports in a port-channel. 1q trunk. Clients will appear from different ports as they re-associate to other APs/cells in the ESSID. 4654. 410e in vlan 1 is flapping between port Gi1/0/11 and port Gi2/0/12 It is happening on a stacked switch What's this and how to solve it? For me, it 1664321: Nov 14 11:18:16 UTC: %MAC_MOVE-SP-4-NOTIF: Host aaaa. Jun 12 22:08:42. They are used to transmit packets from multiple VLANs between gear usually and will add 802. what occasion does mac flapping happen? -> I guess it is wireless roaming. Router and Windows AD/DC are plugged into the unmanaged Netgear switch. Hi I am geeting the below erros can some one suggeest me on the same Nov 16 17:50:28. bae5 in vlan 5 is flapping between port Gi1/0/3 and port Gi1/0/4 %SW_MATM-4-MACFLAP_NOTIF: Host c417. Mac flapping can happen in WLC environment? -> I guess Mac flap in WLC environment means Roaming is not properly working. The only way to stop the flapping is to shutdown all unused ports. 05c8. 3841 in vlan 138 between port Gi1/0/19 and port Gi1/0/21 Can you tell me the reason why my switch is telling me that there is another Mac Hi All, I have a Cisco 3850X switch that has two Unifi APs (model U6-LR) connected. Subscribe to RSS Feed; Mark Topic as New; Mark Topic as Read; Also, on your trunk ports to APs, it is always a good idea to allow only the vlans that need to be on the trunk port and not all vlans. switchport trunk allowed vlan 1 switchport mode trunk speed 1000 duplex full channel-group 2 mode active and interface GigabitEthernet0/17 description BA_DMZ (Assigned to Po2 for SMG purpose) switchport trunk allowed vlan 1 switchport mode trunk speed 1000 channel-group 2 mode active. By default a trunk port will pass traffic for all VLANs but you can set allowed VLANs to further lock it down. 7044 in vlan 889 is flapping between port Gi0/10 and port Gi0/12 007307: Dec 23 08:48:46 cet: Community. 19da. A trunk port allows you to send all those signals for each switch or router across a single trunk link. Not that it mattered because it was only portfast, Hi, I did quite abit of work on our wireless network last night and I'm seeing alot of these logs on our core switch after the work 069130: Feb 16 12:36:20 CST: %SW_MATM-4-MACFLAP_NOTIF: Host 0018. The vsphere host is a blade, its networking comes from a HP Virtual Connect Switch, the two ports providing uplink are configured on the cisco 4507 as follows: Switch4#sh int tru Port Mode Encapsulation Status Native vlan Gi1/2 on 802. 1q inserts tags in the frame to identify individual vlans when a trunk will carry more than one vlan. switchport trunk allowed vlan x, y, z. 6000 in vlan 75 is flapping between port Gi1/0/25 and port Gi2/0/26. If one of the APs has no native vlan or the wrong one configured this could The MAC flapping errors indicate that the switch is receiving packets with the same source MAC address on different ports (which normally shouldn't be happening). I am just wondering what would be the issue, could it be because people on their mobiles moving around the building and jumping between all the APs I am having a flapping issue on two trunk ports. You may say this used for two purposes. Step 4. The port 2/1 is a trunk port, I have a Catalyst 4006 with a module RSM, I have about 25 vlans. 2. A Router is connected I can see Mac flapping log between two APs in serval sites but most sites are not. 637: %SW_MATM-4-MACFLAP_NOTIF: Host xxxx. 7aac in vlan 130 is flapping between port Gi3/0/24 and port Gi3/0/20 (KAH-3850-CORE1-1) *Jan 29 16:25:09. 0/24) for DATA and VLAN 20 (192. Gi1/1 1,25,49,79. configuration on the VSS: interface TenGigabitEthernet1/1/9 switchport mode trunk Host 685b. b5d1. bc41 in vlan 20 is flapping between port Te2/1/1 and port Po22 (Access-2-2-2) That's just an example, switchport trunk native vlan 100. It was recommended to me to downgrade to 8. Port Vlans in spanning tree forwarding state and not pruned Po1 Po1 10,14,101,148. The Host will flap between Port Channel 1, and the Channel above. Flapping occurs in AP's management vlan (VLAN ID 99). We have done a lot of research and there seem to be a lot of theoretical answers but no one who uses it in practice. Got this log entry, repeated many times: %SW_MATM-4-MACFLAP_NOTIF: Host 2c76. %SW_MATM-4-MACFLAP_NOTIF: Host c417. 6f80 in vlan 35 is flapping between port Po256 and port Po308. 93a4 in vlan 1 is flapping between port Gi1/0/2 and port Gi1/0/1 Gi1/0/1 is PC Gi1/0/2 is connected to an unmanaged switch which at this point is kind of the nucleus of our small network. 1 person had this problem. Buy or Renew. 125: %SW_MATM-4-MACFLAP_NOTIF: Host 3859. Let me share the following articles below for further information: How do I setup a VLAN trunk link between two NETGEAR switches? 2024 Jun 6 12:17:47 SW-B %FWM-6-MAC_MOVE_NOTIFICATION: Host 547f. When this occurs, a syslog message similar to the following will appear:. I’m confused why something like port 23 would have MACFLAP errors, its a CCTV camera directly connected with a network cable, nothing else is on that port. 9718 in vlan 802 is flapping between port Gi1/0/2 and port Gi2/0/2 . . load-interval 30. between the specified ports. The switch stack comes into the switch with the fiber on a cat5E cable and goes out on the fiber port. a863. I discovered a loop in a switch layer 2 connected in my port 3/46. 311c. 2f80 ARPA Vlan50 I’m having a problem with multicast causing flapping between a trunk port and an access port. 435 GMT: %C4K_EBM-4-HOSTFLAPPING: Feb 11 14:43:14. We trunk all vlans from main site to new site with a trunk port. 3c5d. If a trunk port with VLAN 1 disabled is converted to a nontrunk port, it is added to the access VLAN. This results in the MAC address entry in the MAC address table continually changing from port to port. We have about 73 VLANs across the network. switchport mode trunk switchport nonegotiate. xxxx was first learned on interface May 10 02:00:39. Port Vlans allowed on trunk Po1 14,10,101,148. Trunk ports. Paul. 0034 on VLAN 2 detected flapping between port Gi0/1 and port Gi0/2. 279 GMT: %C4K_EBM-4-HOSTFLAPPING: Host 00:1C:A8:A7:6E:08 in vlan 9 is flapping between port Gi6/33 and port Gi6/6. 001905: Host 00:12:79:D5:E3:B3 in vlan 112 is flapping between port Gi1/1 and port Gi3/21 . res. 7781 in vlan 1 is flapping between port Gi0/17 and port Gi0/15 Please guide me how to fix it, config of my switch is pasted below Config: I've got 2 stacks of Catalyst 4506-E switches (Core01 & Core02) with a 4 link port channel (Po1) configured between them. Port Vlans in spanning tree forwarding state and not pruned Po1 14,10,101,148. my question is . HYG the config::: interface Ethernet1/9 description VPC KEEPALIVE switchport access vlan 123 speed 1000! interface port-channel1 description vPC-PeerLink switchport mode trunk no lacp Our network topology has four switches that are configured to use PAgP trunks between them. So you need to make sure that ALL switches are running the same MST configuration and revision number, secondarily suggest not to manually prune vlans on any trunks as MST is ran on a per instance stp and not per Hi, While I am getting Vlan Flapping on LAN network and seeing regular logs on my core switch - 2. 0ed3 in vlan 802 switchport trunk native vlan 4 switchport mode trunk end interface TenGigabitEthernet1/1/2 Nov 14 08:36:34. 4370 in vlan X is flapping between port Gi1/0/10 and port Po3 Hello, I have a Catalyst 2960S-48 port switch which has 2 VLANS; VLAN 30 (192. I was planning to set it up as trunk with no vlans allowed (switchport trunk allowed vlan none) so that I can add vlans once the port channel is up, however it bounces up and down, then I tried creating a new dummy vlan to go through the link, however it doesn't have any traffic so I don't Solved: I have a strange situation where wireless AP's MAC flaps between trunks a on switch. c395. 625: %SW_MATM-4-MACFLAP_NOTIF: Host 4e9a. 91e1. 3584. The trunk forward the packets and on the other side they are received as "not trunk packets", switchport mode trunk switchport trunk allowed vlan 21,220,240 spanning-tree port type edge trunk spanning-tree bpduguard enable spanning-tree guard root mtu 9216 channel-group 60 mode active no shutdown Switch6 interface port-channel60 description Removed25 PORT 1 & 2 switchport switchport mode trunk switchport trunk allowed vlan 21,220,240 Whenever I connect it to trunk port, I can't access proxmox web gui anymore. 208c. 624: %SW_MATM-4-MACFLAP_NOTIF: Host 0281. c639. there are certain servers from these vlans operating on the 3750. 56a3. f394. VLAN0148 Spanning tree Could we tell where is the issue by the log below: Nov 20 2015 08:44:22. This would be accomplished with a very selective "switchport trunk allowed vlans [X]" statement. The user can carry more than one VLAN traffic from one switch to another switch with Trunk Port whereas data is transmitted simultaneously with Access Port. Then I made trunk (vlan 100, 200 on port 2 of 3750) and connected it with router port 0/0. 8aae. 326: %SW_MATM-4-MACFLAP_NOTIF: Host 148f. In the syslog I see the following message:Host 00:50:56:47:9B:88 in vlan 104 is flapping between port Gi7/4 and port Gi7/6 How can i stop this 'fl vlan flapping between trunk port and etherchannel I have two catalyst 3560 switches. When I connect a sender and a receiver to switch B, after a little bit, and seemingly at random, I will get a mes I have configured two port channel to the oracle switches and the two port-channel are configured in the same setting. 808: %SW_MATM-4-MACFLAP_NOTIF: Host 68ec. I have recently replaced a UCS C-Series server as part of a Refresh Upgrade of our CUCM systems. My config is also pretty straight forward, vlan flapping between port channel and a cisco access point (%SW_MATM-4-MACFLAP_NOTIF:) May 22 20:05:01. Just make another vlan and assign it as the native vlan on the trunk port. One PC is plugged into port 13 of the 24 port switch. 242: %SW_MATM-4-MACFLAP_NOTIF: Host 001b. The next step is to trace that MAC address to the end device and examine the cables, (access, VLAN Flapping Betwen trunk port and access port [closed] Ask Question Asked 9 years, 6 months ago. 838: %SW_MATM-4-MACFLAP_NOTIF: SW_MATM-4-MACFLAP_NOTIF: Host 60f1. A trunk port can carry nontagged packets simultaneously with the 802. Switch A is the core (a 4507) Switch B (a 3850) is trunked to the core with multiple vlans. db2b in vlan 130 is flapping between port Gi2/0/14 and port Gi3/0/18 Aug 8 15:01:49. [enet] is the host MAC address, [chars] [dec] is the switch. 8590 in vlan Xis flapping between port Gi1/0/3 and port Po3 Mar 2 09:24:45. The 3K's are complaining of mac flapping between the port channel interface and the physical interface connected to the first 3K. e05c. 0000 in vlan 499 is flapping between port Twe2/0/12 and port Twe2/0/30 From what I can tell, it seems like STP is blocking vlans 399/499 appropriately for the respective ports/trunks that Hello everybody. %SW_MATM_MACFLAP_NOTIF: Host 000. And we having a problem with the clients of the new site, the mac The links between switches SW2 and SW3 all allow Tagged Packets only and have no PVID (according to the help documentation's recommendations). ee25. MAC address flapping occurs when a switch sees the same MAC address being used on multiple switch ports. 0022. switchport trunk native vlan 99. The 2- How to configure access ports and how to configure trunk ports in netgear switch. Scenario is like that, we are using Ruckus AP and Zone director as a WLAN controller which is direc Hi I am trying to set up a new vpc between a pair of nexus 93180 and nexus 3172. mikey71174. Other ports are either VLAN 1 or VLAN 6, and allow All Packets. Do you have similar issue 00:44:54: %SW_MATM-4-MACFLAP_NOTIF: Host 8000. Labels: Labels: Other Switching; 0 Helpful switchport trunk native vlan X switchport trunk allowed vlan X,Y,Z Host 6caa. The end device of the port is a sharp printer. 3333 in vlan 100 is flapping between port Po2 and port Po6 1d: %SW_MATM-4-MACFLAP_NOTIF: Host 0050. 13fc. I have this problem too. *Mar 12 16:30:57. xxxx in vlan 69 is flapping between port Te4/0/41 and port Te1/1/1 %SW_MATM-4-MACFLAP_NOTIF: you should have a good idea of your network topology in order to do this. One of the trunks is a fiber port connected to the core switch room and the second one is connected to the switch stack. what could be the reason for its frequent flaps. You are going to hop to a different vlan. A trunk port does not forward the frame in its original format. Here is the configuration of the ports in this Channel: interface GigabitEthernet1/0/1 description ***Server Backbone - to Core - Trunk*** switchport trunk allowed vlan 10 switchport mode trunk Cisco Catalyst switches notify when the same MAC address is detected on multiple switch ports, causing the switch to constantly change the port associated with the MAC address, and alert via this syslog that contains the MAC address of the host, VLAN, and ports between which the MAC address is flapping. Note – A user has not assigned any VLANs to other ports of switches, therefore, the other ports will be in VLAN 1 by default. Here is our cur show interfaces trunk. 082b in vlan 14 is flapping between port Te1/0/8 and port Po2 (ced- Hey folks, I hope I'm posting this correctly, I have a single ASA 5510 with a simple port channel connecting to a pair of Nexus 3K's with a peer link between them. Unlike an access port, a trunk port can transmit data from multiple VLANs. ac16. 3c29. Here is a simple topology in which 2 switches are connected and VLANs 2 and 3 are configured on both switches as shown. e969. Also AP's MAC is seen in data VLANs Host 788a. I have configured port gi0/16 on the switch to be the trunk port. Jul 7 11:21:45 HKG: %SW_MATM-4-MACFLAP_NOTIF: Host xxxx. EN US. Dec 20 19:38:39 PHT: %SW_MATM-4-MACFLAP_NOTIF: Host 6000. A debilitating switch port issue network admins try to steer clear of is port flapping. Go to Port Management > Port Settings. Jun 28 12:54:01: %MAC_MOVE-SP-4-NOTIF: Host b407. The switch stack "%SW_MATM-4-MACFLAP_NOTIF: Host xxxx. Out of these 2 ports on each switch, one is that cross connectivity port. show spanning-tree vlan 10. 1q trunking 1 Port Vlans allowed on trunk Gi1/2 1-4094 Port Vlans allowed and active in management domain Gi1/2 1-2,30,40,42,50,60,70,72,80,82,99-100,102,254 Port Vlans in spanning tree forwarding state and not pruned Gi1/2 1-2,30,40,42,50,60,70,72,80,82,99-100,102,254 Switch4#sh int gi1/2 switchport trunk native vlan 50. ports 12 and 10 are configured as trunks. db8f. Edited by A trunk port can become a member of a VLAN if the VLAN is enabled, if VTP knows of the VLAN, and if the VLAN is in the allowed list for the port. 15b3 in vlan 60 is flapping between port Po30 and port Po10 . There is no loop effect with You need to configure at the switch: int range gi1/0/13 -14 channel-group X mode on If they are not in portchannel you should be having many other issues. Host a690. 2. The frame reaches port 1. 290d. 200. on investigation and narrowing down the issue, final tail switch is showing flapping among Trunk port and Host ports. Gi1/1 1,25,49,79----- I can't seem to get VLAN 79 through to the first switch (3560G). The Cisco switch logs seems to indicate mac flapping between Te9/1/1 (the IOA) and Gi1/0/11 (The CMC Management port). 036: %SW_MATM-4-MACFLAP_NOTIF: Host dc0b. f9c3. For sure, due to the loop. 076 MDT: Flapping between ports? How to fix and could it cause AP to crash? Options. 6bb2. 2140. bae5 in vlan 5 is flapping between po PC1 generates a broadcast frame. Port Vlans allowed and active in management domain Po1 14,10,101,148. what could cause the portchannel to go down if arp inspection and dhcp snooping is enabled & how to fix this up. This will show you what ports are forwarding and its is also where you should discover what port shouldn't be in a %SW_MATM-CLUSTER_MEMBER_4-4-MACFLAP_NOTIF: Host 0800. 1 Accepted Solution Greeetings to all, I am continuously getting log on my 3560 switch of %SW_MATM-4-MACFLAP_NOTIF: Host 0090. xxxx in vlan 1 is flapping between port Twe1/0/19 and port Twe1/0/5 Nov 14 08:36:34. Mar 2 11:17:50. 0012 in vlan 18 is flapping between port Gi1/0/23 and port Po1. Symptoms On the impacted device, the port-channel belonging to the VPC is considered non-vpc internally, causing unknown unicast traffic arriving from VPC peer to be forwarded towards the local port-channel Typical symptoms include: -Broadcast traffic is seen to be flooded back out Again, the difference between the ports that work and the one that has a problem is that the ones that work have a label of TRUNK as opposed to the questionable one that has the label of 1. %SW-MATM-4-MACFLAP_NOTIF: Host 0c8d. Our switch displaying the following when turning on terminal monitor (This is just a few of the offending ports) 46w3d: %C4K_EBM-4-HOSTFLAPPING: Host 00:50:56:98:48:86 in vlan 10 is flapping between port Gi3/8 and port Gi2/26 The main and basic use of these both the trunk port and access port is to move traffic between VLANs. I'm presuming you're talking about Cisco IOS here, based on the term "MACFLAP", which appears in their log messages when *Jan 29 16:23:42. any other reason or possibility? In your configs, many description entries say that both switches go to the same remote switch on the same port: interface FastEthernet0/15. When is connect to core switc(4506e) through console, i found following - 00:06:51: %C4K_EBM-4-HOSTFLAPPING: Host 02:26:9E:DA:E9:C3 in vlan 1000 is flapping between port Gi4/3 Trunking using 802. c52a. A quick diagram: Dec 20 19:38:39 PHT: %SW_MATM-4-MACFLAP_NOTIF: Host 6000. 1Q Native disl auto Media unknown DTP Nonegotiate 0 0 Port Protected 0 If another port has a different native vlan, then you can see what is going to happen. 529: %SW_MATM-4-MACFLAP_NOTIF: Host <MAC_ADDRESS> in vlan X is flapping between port Gi0/Y and port Gi0/Z Questions There's a port channel to stack 1 and the ports are g1/1/1 and g2/1/1 - po3. sh int trunk. So the switch uses tags to know whether a particular frame belongs to vlan 1 or to vlan 5 or to vlan 10. 119 UTC: %SW_MATM-4-MACFLAP_NOTIF: Host 000a. Regards, Vijay Bhandari. Mar 11 11:43:02 IST: %MAC_MOVE-SP-4-NOTIF: Host 001f. Try to disable them manually or do a shutdown on the interface connected to it. 4444 in vlan 100 is flapping between port Po2 and port Po6 I have an ESX server with two NIC's connected to two seperate 2960 switches (for reducnecy presumably) The two 2960 have a trunk to the core switch 4507. xxxx in vlan 123 is flapping between port Eth1/9 and port Po1. Hello spanning-tree portfast edge bpdufilter default < wow!!!! I would remove this ASAP , it can cause you all sorts of problems, including the one you are experiencing now. 3bc0 in vlan 112 is flapping between port Gi7/0/48 and port Po2 Del: Tracebacks seen while Configuring Layer 2 dot1q trunk Cross-Box EC CSCsl49153 Description Symptom: Logs with traceback may appear when deleting interfaces from etherchannel (i. b856 in vlan 20 Host 0026. Error: 40371: 5w2d: %SW_MATM-4-MACFLAP_NOTIF: Host e41f. I first noticed this on APs that would just go down after 40 days or so. All ports are autonegotiate except the occasional 100Mb Full Duplex settings; others are all 1Gb - none are 10Mb. Hello, I have been receiving below messages on 3 switches. e107. 21d4 in vlan 12 is flapping between port Gi3/0/7 and port Gi3/0/6 Mar 24 16:36:38. 0 Kudos Subscribe. and the MAC address-table would become: switchport trunk allowed vlan 1,11,12 we have coonection between c3750 and wlc 5508 and it shows that mac address flaps between two interfaces of c3750. and the MAC address-table would become: switchport trunk allowed vlan 1,11,12 A user probably has a hub attached to your network and thought he could "double" his bandwidth by attaching two cat 5 cables to his hub. Not all of them tho. 662: %SW_MATM-4-MACFLAP_NOTIF: Host 1098. Also your running mst spanning-tree, but you are have vlan priority's not relating to mst mode and are manually pruning the Aug 25 21:35:58 MDT: %SW_MATM-4-MACFLAP_NOTIF: Host 0052. Router 0/1 is access port coming back to cat 3750 port 1 with vlan 300. vss interface TenGigabitEthernet2/6/1 switchport switchport mode trunk storm-control multicast level 1. ad52. end . 86dd. How do I find this host and stop the flapping? Catalyst 4000 12. b314. xxxx in vlan 99 is flapping between port Gi1/0/1 and port Te1/0/1. Host 8434. 2f80 in vlan 80 is flapping between port Po26 and port Po10" ##### show arp# Internet 10. I tried to troubleshoot but not able to succeed. 696 cdt: %C4K_EBM-4-HOSTFLAPPING: Host 00:50:56:AE:6F:A0 in vlan 8 is flapping between port Gi5/3 and port Gi5/4 These three mac addresses are on one particular ESX host. So no pattern there. When you assign a default port VLAN ID to the trunk port, all untagged traffic travels on the default port VLAN ID for the trunk port, and all untagged traffic is Dear All, Two days back my entire network was behaving in unusual ways. This will tag all the vlans going to the HP switch. Port gi0/1 on the switch is Sep 23 04:05:10. CCIE Routing and Switching; Like; Answer; Share; 12 answers; 790 views; azharmunawar. 0 Helpful Reply. 567f in vlan 211 is flapping between port Gi1/0/47 and port Gi1/0/45 switchport trunk allowed vlan <> switchport mode trunk switchport nonegotiate. 8009 in vlan 21 is flapping between port Gi0/7 and port Po3. 069d. Ports are configured as such, with 5 Hello, I am facing a problem that has to do with mac flapping between ports in a specific vlan. Chinese; EN Hello Team, I have Core A and Core B running in HSRP and both core are in Stack. This is on both switches. Level 10 Options. Surprisingly, both ports on the connected devices have a shared MAC and IP address, and both are in forwarding state on the switch side (one port is not blocked by the spanning-tree). I seen this often on misconfigured ports. xxxx. 294: 1664321: Nov 14 11:18:16 UTC: %MAC_MOVE-SP-4-NOTIF: Host aaaa. 2958. 6649 in vlan 20 is flapping between port Gi1/0/24 and port Gi1/0/7. There is another trunk port 2/2, both are connected in GigabitEthernet's RSM 3 and 4. Jul 16 08:26:24. xxxx in vlan 94 is flapping between port Gi0/6 and port Po1 The AP between gateway just a L2 trunk and the AP is a third party AP, I am sure it doesn't form a loop topology within my known network devices. Click Apply. 1f3c in vlan 16 is flapping between Dear Folks, I am working with a IT organization as network administrator, at client site we are getting the MAC FLAPPING issue since 1 month, due to that some time it completely down my whole network. 1q. "static" Access ports belong to a single VLAN and accept traffic only from that same VLAN. 0. 1700. Gi1/1 1-4094. 805260: *Feb 1 02:24:46. I have connected a new device that allows for video conferencing and it is reporting MAC address flapping. G0/7 is the interface connecting kber1309 to kber1308 . However if I remove vlan 1 from this switchport and instead use this line on the Cisco side: switchport trunk allowed vlan 5,10,20,21,172. 103 again. Switch 1 is the root bridge for all Vlans. EXT-SW01#show Hi, today we faced MAC Address flapping on our network that caused some down time. We have 2 C1000 switched, a 24 port and a 16 port. 1Q tagged packets. So for example below: Feb 22 11:41:13. switchport mode trunk . 09d7. interface GigabitEthernet0/A switchport access vlan X switchport mode access channel-protocol lacp channel-group X mode active ! Log. We have been receiving these notifications on one of our core. interface GigabitEthernet0/51 . The reason for this is due to the fact that switch learns of a particular we have a main site (headquarters) and recently we connect a new site by a Lan to lan link. This is setup as an access port on VLAN 200 and for some reason it keeps jumping a Both Fa2/0/11 and Fa2/0/12 are trunk ports and connected to NAS-Server. The default of an unconnected port seems to be 1 - when I connected my old switch again the port changed to TRUNK without any input from me. This instability caused by flapping ports affects network connectivity and degrades the end-user experience. 0000. 0081 in vlan 12 is flapping between port Gi0/9 and port Gi0/8. I did find that one of the trunk/uplink ports was configured with portfast which I removed. Level 1 Options. Thanks & Regards, B. To configure trunk ports, set the ports as tagged (T). e846. and vlan 300 is providing internet to all access switches. e71a in vlan 100 is flapping between port Gi0/1 and port Gi0/2 I am attaching a diagram to give you more information about topology. vlan 102 spanning-tree portfast end interface GigabitEthernet0/1 description " connecting to SDC-SWH-IVRS-6 GI 0/2" port-type nni switchport trunk allowed vlan 102,200 switchport mode trunk end. I am having a flapping issue on two trunk ports. Gi0/1 10,51,950. When I looked this up I have seen that this will happen if a device from one port is moved to another quickly. N5K Bcast Packets flooded out of ingress vPC, vPCM out of sync with FWM. I could see this if DTP was negotiating. On the Cisco switch by default Vlan 1 is the native vlan. The topology looks like this: Interface Po1 connects my two 6500 core switches, we have HSRP running for each vlan on the the wireless networ 8. 3. 5e00. 620: %SW_MATM-4-MACFLAP_NOTIF: Host f86f. Try explicit tagging of the Hi I have a big problem with Vlan flapping, this is my topology Switch 1 and Switch 2 have the SVI and HSRP configured. xx in vlan 123 is flapping between port Gi1/18 and port Po1" entries on my core switches. 3c51 in vlan 56 is flapping between port Po5 and port Te7/2 Jun 28 12:54:01: %MAC_MOVE-SP-4-NOTIF: Host 145a. 2b4b in vlan 50 is flapping between port Po2 and port Po1 May 26 16:56:25: %SW_MATM-4-MACFLAP_NOTIF: switchport trunk allowed vlan 5,50,100 switchport mode trunk end Show interface outputs show no errors or interface resets on the ports themselves. Kevin Dorrell. 0 and 0/0. we have arp inspection & dhcp snooping on certain vlans. The access point is connected to port 7, while the switch uplink is port 24. (SVI) because Interpod spine switches reuse the same MAC address; which causes flapping of MAC address in the IPN Layer 2 network. 342: %SW_MATM-4-MACFLAP_NOTIF: Host 14fe. b120 in vlan 6 is flapping between port po3 and port gi1/0/24 Not understanding why is there a mac flap between its own port and po3 (connected to stack01) Feb 17 12:38:17. Is the mac address constant which is flapping between the ports? 6 mac address flapping , which is in another switch 3650 switch all port are in vlan 1 except gi0/1 assigned to vlan 20 . I am seeing the following message in my logs: Apr 21 10:25:24: %SW_MATM-4-MACFLAP_NOTIF: Host 3af0. int fa x/y What's strange with this, however, is that the MAC address that is flapping, is the MAC address of the firewall. ac38 (recording server mac) in vl Is this Mac flapping causing any trouble for you? It is very normal on switch to display this mac flapping message if APs are connected to the switch port. Jun 1 14:09:00 MDT: %SW_MATM-4-MACFLAP_NOTIF: Host 0050. dd88 in vlan 1 is flapping between port Gi1/0/37 and port Gi1/0/38. 191: *Mar 7 02:30:48. 793: %SW_MATM-4-MACFLAP_NOTIF: Host 0090. Since a trunk port belongs to all VLANs, the switch decides to forward it from port 8. 2222 in vlan 100 is flapping between port Po2 and port Po6 1d: %SW_MATM-4-MACFLAP_NOTIF: Host 000c. 895 GMT: %SW_MATM-4-MACFLAP_NOTIF: I am exp MAC Flapping on a 2960-24-TC-L switch between multiple ports (flapping ports move as I shutdown interfaces). 604d in vlan 1 is flapping between port Gi1/0/12 and port Po1 switchport mode trunk! interface GigabitEthernet0/0 vrf forwarding Mgmt-vrf no ip address shutdown negotiation auto! interface GigabitEthernet1/0/1 . 90a3. Disabling Energy Efficient Ethernet (EEE) Are you are still experiencing link flapping after checking your topology, devices, and enabling Link flap prevention? Could be a L2 loops but we cant find the root cause, Mac that are Flapping are from different vlans and dislocated on different switch. These 2 switches are used to connects end user devices, polycom phones, APs etc. Host ec30. Set the ports as untagged (U) to configure access ports. I have two vlans (1-30). d4xx. Port Vlans allowed on trunk Po1 Po1 10,14,101,148. Reply. show spanning-tree vlan 14. Now, note that the link between the switches has to be configured as a trunk port because here more than one VLAN show interfaces trunk. interface Port-channel2 switchport trunk allowed vlan 1 We boiled it down to the simplest case. 37ed in vlan 140 is flapping is flapping between port Gi1/0/9 and port Gi1/0/12 (L3 switch that connect by trunk with core switch) 000635: Sep 23 05:24:16: %SW_MATM-4-MACFLAP_NOTIF: Host 0025. Goes up and down. f902. my Question is that, if Flapping happening between Trunk ports or Hub ports that is understandable, Vlan 15 is access port and remaing vlans are trunk ports on switch and Nortel FW. Beyond this switch there is a router Solved: Hi there, According to syslog, one port of one of our switches keeps flapping. 4674. 697 UTC: %SW_MATM-4-MACFLAP_NOTIF: Host 0000. Stats are pasted below for both switches 1st Switch:. If you have a dozen VLANs on a particular switch, you don’t need additional cables or switches for each VLAN—just that single link. show spanning-tree vlan 148. The network is segmented into multiple VLANs, and there is no direct Hi all, I've been getting "%MAC_MOVE-SP-4-NOTIF: Host xx. I didn't configure etherchannel for the access port but only for trunk port. issue a showmac-address-table address of each host that were flapping based on your syslogs. they are connected via a single trunk port using 082. On the Port Settings page, enable Link Flap Prevention by checking the Enable box. 290b in vlan 25 is flapping between port Po2 and port Po4 switchport trunk native vlan 10 switchport trunk allowed vlan 9,10 switchport mode trunk! Hello all, I'm currently running into some issues and the result is that we have mac-flapping between a port-channel and a normal uplink. aaaa. 7a1d. This can also cause a L2 loop (see mac flapping) because (R)STP works within one single vlan and hopping between vlans can create a loop because you can avoid blocking or discarding ports. Looking at the log file we noticed the situation that you can see: Apr 10 08:19:51. Below is the details attached for If I remove the 'switchport trunk' settings from the physical interfaces then I get the following error: %EC-5-CANNOT_BUNDLE2: Gi1/1/2 is not compatible with Po2 and will be suspended (vlan mask is different). I've got 2 routers, a 3845 and a 7206VXR connected to both Core01 & Core02 at ports Gi4/45 and Gi2/11 on both switches. I found these in the log section: Jul 16 10:24:04 switch-dist 41042: . 50. I would like to create two trunk ports for each VLAN to keep the traffic separated to the next hop gateway. 415: %SW_MATM-4-MACFLAP_NOTIF: Host c486. If you know your physical topology then somewhere between you switches you have a loop. Port 6 is an access port, the host is a normal PC On switch 1 i see these logs: 007306: Dec 23 08:48:13 cet: %SW_MATM-4-MACFLAP_NOTIF: Host f80d. Port Vlans allowed and active in management domain Po1 Po1 10,14,101,148. 1q tags to the traffic to differentiate between VLANs. By right, ALB teaming mode shouldn't need the etherchannel for the switch, right? Port Vlans allowed on trunk. When the flapping occurs I’m seeing it happen on all my core VLAN’s as well as on the ports these dumb switches are on. 8920. #sh int Gi2/0/11 GigabitEthernet2/0/11 is up, line protocol is up (connected) I terminated both ISP's in switch assigning vlan 100 (port 3 of 3750) and vlan 200 (port 4 of 3750). The message vlan X is flapping between port Gi1/0/2 and Good Morning, I have a problem with a couple of Cisco Switches 3850 which have the distribution function. b315. 254 23 ec30. 6c67. 3fde in vlan 20 is flapping between port Gi1/0/42 and port Gi1/0/24 Apr 21 10:25:27: %SW_MATM-4-MACFLAP_NOTIF: Host ce74. 3 on the controller. We are currently trunking all fiber ports 802. I have a Cisco C2960-L switch & Cisco 1921 router. fea9. Recommended Action The switch found the traffic from the specified host flapping. The log message indicates that MAC address 0011. 29d2. 1. Cisco C2960 Configuration. MIL3850#sh cdp ne Capability Codes: R - Router, T - Trans Bridge, B 2024 Jun 6 12:17:47 SW-B %FWM-6-MAC_MOVE_NOTIFICATION: Host 547f. interface Port-channel10 interface Port-channel20 interface GigabitEthernet1/0/23 switchport mode trunk channel-group 10 mode active ! interface GigabitEthernet1/0/ *Mar 16 16:53:27. 4:45. Labels: Labels: LAN Switching; 0 Helpful Reply. Just to inform you I am working on a Data Center environment and the implementation is using VPC and port-channels and all ports are configured in such a way to support it. Flapping ports connect to APs, trunk port to other 2960X, as well as other devices. 1f3c in vlan 16 is flapping between port Gi2/0/6 and port Po1 Nov 16 18:09:18. There are two ports from two 6500 to two 4500 in trunk all that go in err-disable cause UDLD. 783: %SW_MATM-4-MACFLAP_NOTIF: Host 6caa. 746: %SW_MATM-4-MACFLAP_NOTIF: Host 0025. Port Vlans allowed and active in management domain. edb9 in vlan 71 is flapping between port Gi1/0/8 and port Gi2/0/8. 023020: switchport trunk native vlan 23 switchport mode trunk end. So it's definitely not normal behavior, nor was it a configuration switchport trunk allowed vlan 2-998,1000-4094 switchport mode trunk spanning-tree bpduguard enable! interface GigabitEthernet1/0/2 switchport Hi all, we have two WS-C3850-24XS connected in stak between them, connected to different servers. This issue is happened sporadically. %SYS-4-P2_WARN: 1/Host 00:05:31:df:b8:09 is flapping between port 3/46 and port 2/1. When VTP detects a newly enabled VLAN and the VLAN is in the allowed list for a trunk port, the trunk port automatically becomes a member of the enabled VLAN. Most devices that participate in trunks will understand and process the vlan tags. ac14 1) Is the flapping MAC always flapping between host vPC and vPC link or do you see it flapping between other ports too? 2) How often do you see a given MAC flapping during the day? 3) Do you see the flapping on one N5k Ports. Please rate and mark as an accepted solution if you have found any of the information provided useful. 5687. aaaa in vlan A is flapping between port 0/1 and port 0/2. I'm trying to set up an internal switch infrastructure, such that each of my linux servers are connected to both switches, using etherchannel on the switch, and bonding on the linux host. All forum topics; Previous Topic; Next Topic; 2 Replies 2. Port Channel 1 is the connection from this Switch to the Core Switch (3750). All interfaces configured the same way . Host 0050. I can then manage the IOA IP address at 10. 5e11 in vlan 200 is Pelase advise. HTH . 98ee in vlan 105 is flapping between port Gi0/23 and port Gi0/4 As per my understanding there is This occurs a couple times an hour going back as far as the log stores messages. Or someone plugged a crossover cable between 2 ports on the same switch, both ports would have to have BPDU filter enabled on them for that to be an issue though. The logs on the 24 port switch indicate abnormal condition of mac address flapping for the switchport trunk allowed vlan 3,70,71,210,666,1070,2225,2564 . b3ef. 4. 5677. nhgwi xfsds qckqbmhi qvuarq jhpgqw gmgtm tbnesgth tmrjeka buimoa lpyp