MAC flapping occurs in WS-C6509-E modular switch

[vinoth.R1@ge.com]

In the site vlan 1 as the management subnet & user [data] subnet & currently this switch acting as layer 2.

Issue: [error]

075532: *Mar 9 02:25:56: %MAC_MOVE-SP-4-NOTIF: Host 0000.0000.0000 in vlan 1 is flapping between port Fa4/36 and port Fa9/18
075533: *Mar 9 02:25:56: %MAC_MOVE-SP-4-NOTIF: Host 0000.0000.0000 in vlan 1 is flapping between port Fa8/29 and port Fa9/18
075534: *Mar 9 02:26:00: %MAC_MOVE-SP-4-NOTIF: Host 0000.0000.0000 in vlan 1 is flapping between port Fa4/36 and port Fa9/18
075535: *Mar 9 02:26:00: %MAC_MOVE-SP-4-NOTIF: Host 0000.0000.0000 in vlan 1 is flapping between port Fa8/29 and port Fa9/18
075536: *Mar 9 02:26:31: %MAC_MOVE-SP-4-NOTIF: Host 0000.0000.0000 in vlan 1 is flapping between port Fa9/18 and port Fa8/29
075537: *Mar 9 02:26:35: %MAC_MOVE-SP-4-NOTIF: Host 0000.0000.0000 in vlan 1 is flapping between port Fa9/18 and port Fa8/29
075538: *Mar 9 02:27:10: %MAC_MOVE-SP-4-NOTIF: Host 0000.0000.0000 in vlan 1 is flapping between port Fa8/29 and port Fa9/18
075539: *Mar 9 02:27:41: %MAC_MOVE-SP-4-NOTIF: Host 0000.0000.0000 in vlan 1 is flapping between port Fa8/29 and port Fa2/37
075540: *Mar 9 02:27:41: %MAC_MOVE-SP-4-NOTIF: Host 0000.0000.0000 in vlan 1 is flapping between port Fa9/18 and port Fa2/37
075541: *Mar 9 02:27:45: %MAC_MOVE-SP-4-NOTIF: Host 0000.0000.0000 in vlan 1 is flapping between port Fa9/18 and port Fa2/37
075542: *Mar 9 02:28:16: %MAC_MOVE-SP-4-NOTIF: Host 0000.0000.0000 in vlan 1 is flapping between port Fa2/37 and port Fa9/18
075543: *Mar 9 02:28:16: %MAC_MOVE-SP-4-NOTIF: Host 0000.0000.0000 in vlan 1 is flapping between port Fa4/36 and port Fa9/18
075544: *Mar 9 02:28:20: %MAC_MOVE-SP-4-NOTIF: Host 0000.0000.0000 in vlan 1 is flapping between port Fa2/37 and port Fa9/18
075545: *Mar 9 02:28:20: %MAC_MOVE-SP-4-NOTIF: Host 0000.0000.0000 in vlan 1 is flapping between port Fa4/36 and port Fa9/18
075546: *Mar 9 02:28:55: %MAC_MOVE-SP-4-NOTIF: Host 0000.0000.0000 in vlan 1 is flapping between port Fa4/5 and port Fa8/21

Above ports are belongs to DATA vlan [ end user ports]. Kindly help us to resolve this issue.

if i enable no mac address move notification commands , if its works ?

Thanks,

Vinothkumar.R  

[Leo Laohoo]

Make sure there are no un-managed switch or hubs connected to those ports.

[vinoth.R1@ge.com]

Hi Leo Laohoo,

Thanks for the update.

Am sure no unmanaged switch connected.

its says mac address 0000.0000.0000

075546: *Mar 9 02:28:55: %MAC_MOVE-SP-4-NOTIF: Host 0000.0000.0000 in vlan 1 is flapping between port Fa4/5 and port Fa8/21

Thanks,

Vinothkumar.R

[balaji.bandi]

This flapping phenomenon may be the result of a Layer loop somewhere in your network, especially when STP is disabled for some reasons.

or May some Dodgy device failed.

check do you see any ARP table has that MAC Address and shutdown that port and clear the ARP and check is this resolves the issue.

can you post

show modules and show version

[Leo Laohoo]

---

vinoth.R1@ge.com wrote:

075534: *Mar 9 02:26:00: %MAC_MOVE-SP-4-NOTIF: Host 0000.0000.0000 in vlan 1 is flapping between port Fa4/36 and port Fa9/18

---

What is the configuration of these ports?  Are they trunk ports or access ports? 

[vinoth.R1@ge.com]

Hi All,

Please find the show module & version & switch port details.

Switch# show module
Mod Ports Card Type Model Serial No.
--- ----- -------------------------------------- ------------------ -----------
1 24 CEF720 24 port 1000mb SFP WS-X6724-SFP SAL13474AZD
2 48 48 port 10/100 mb RJ45 WS-X6348-RJ-45 SAL05096649
3 48 48 port 10/100 mb RJ45 WS-X6348-RJ-45 SAL050969UD
4 48 48 port 10/100 mb RJ45 WS-X6348-RJ-45 SAL05096B3U
5 2 Supervisor Engine 720 (Active) WS-SUP720-3B SAL13474BK0
6 2 Supervisor Engine 720 (Hot) WS-SUP720-3B SAL13474BGQ
7 48 48 port 10/100 mb RJ45 WS-X6348-RJ-45 SAL050969UD
8 48 48 port 10/100 mb RJ45 WS-X6348-RJ-45 SAL0810VV4U
9 48 48-port 10/100 mb RJ45 WS-X6148-RJ-45 SAL0747PRK0

Siwtch#show version
Cisco IOS Software, s72033_rp Software (s72033_rp-IPSERVICES_WAN-VM), Version 12.2(33)SXI2a, RELEASE SOFTWARE (fc2)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2009 by Cisco Systems, Inc.
Compiled Tue 01-Sep-09 14:24 by prod_rel_team

ROM: System Bootstrap, Version 12.2(17r)SX5, RELEASE SOFTWARE (fc1)

XXXXXXXXXXX uptime is 3 weeks, 4 days, 14 hours, 50 minutes
Uptime for this control processor is 3 weeks, 4 days, 14 hours, 49 minutes
Time since XXXXXXXXXX switched to active is 3 weeks, 4 days, 14 hours, 49 minutes
System returned to ROM by power cycle at 23:13:48 UTC Tue Oct 17 2017 (SP by power on)
System image file is "sup-bootdisk:s72033-ipservices_wan-vz.122-33.SXI2a.bin"
Last reload reason: Reload Command

cisco WS-C6509-E (R7000) processor (revision 1.5) with 516096K/8192K bytes of memory.
Processor board ID SMC1344001N
SR71000 CPU at 600Mhz, Implementation 1284, Rev 1.2, 512KB L2 Cache
Last reset from s/w reset
5 Virtual Ethernet interfaces
288 FastEthernet interfaces
28 Gigabit Ethernet interfaces
1917K bytes of non-volatile configuration memory.

65536K bytes of Flash internal SIMM (Sector size 512K).
Configuration register is 0x2102

Patching is not available since the system is not running from an installed image.
To install, please use the "install file" command.

Switch port configuration:
=========================
Switch#show run int fastEthernet 4/36
Building configuration...

Current configuration : 99 bytes
!
interface FastEthernet4/36
switchport
speed 100
duplex full
spanning-tree portfast edge
end

switch#show run int fastEthernet 9/18
Building configuration...

Current configuration : 99 bytes
!
interface FastEthernet9/18
switchport
speed 100
duplex full
spanning-tree portfast edge
end

Let me try to shutdown the port & clear the mac address.

Thanks,

Vinothkumar.R