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Webcast-Catalyst9k
New Member

Problem in Catalyst switch 3560 ???

I'm connecting two catalyst 3560 switches to each other using trunk port and I'm getting below logs on one of them. Any ideas ???


18:43:38: %SW_MATM-4-MACFLAP_NOTIF: Host ac7b.a15b.3c2c in vlan 40 is flapping between port Fa0/1 and port Fa0/7
18:45:00: %SW_MATM-4-MACFLAP_NOTIF: Host ac7b.a15b.3c2c in vlan 40 is flapping between port Fa0/1 and port Fa0/7
18:45:45: %SW_MATM-4-MACFLAP_NOTIF: Host ac7b.a15b.3c2c in vlan 40 is flapping between port Fa0/1 and port Fa0/7
18:46:39: %SW_MATM-4-MACFLAP_NOTIF: Host 3c97.0e53.cdf3 in vlan 40 is flapping between port Fa0/1 and port Fa0/6
18:46:53: %SW_MATM-4-MACFLAP_NOTIF: Host 3c97.0e53.cdf3 in vlan 40 is flapping between port Fa0/1 and port Fa0/6
18:46:55: %SW_MATM-4-MACFLAP_NOTIF: Host ac7b.a15b.3c2c in vlan 40 is flapping between port Fa0/1 and port Fa0/7
18:47:03: %SW_MATM-4-MACFLAP_NOTIF: Host 3c97.0e53.cdf3 in vlan 40 is flapping between port Fa0/6 and port Fa0/1
18:47:06: %SW_MATM-4-MACFLAP_NOTIF: Host ac7b.a15b.3c2c in vlan 40 is flapping between port Fa0/1 and port Fa0/7
18:47:15: %SW_MATM-4-MACFLAP_NOTIF: Host 98f1.7093.5d50 in vlan 40 is flapping between port Fa0/1 and port Fa0/7
18:49:02: %SW_MATM-4-MACFLAP_NOTIF: Host 3c97.0e53.cdf3 in vlan 40 is flapping between port Fa0/1 and port Fa0/6
18:49:13: %SW_MATM-4-MACFLAP_NOTIF: Host 3c97.0e53.cdf3 in vlan 40 is flapping between port Fa0/1 and port Fa0/6
18:50:18: %SW_MATM-4-MACFLAP_NOTIF: Host ac7b.a15b.3c2c in vlan 40 is flapping between port Fa0/1 and port Fa0/7
18:55:09: %SW_MATM-4-MACFLAP_NOTIF: Host 3c97.0e53.cdf3 in vlan 40 is flapping between port Fa0/1 and port Fa0/6
18:55:22: %SW_MATM-4-MACFLAP_NOTIF: Host 3c97.0e53.cdf3 in vlan 40 is flapping between port Fa0/1 and port Fa0/6
18:56:34: %SW_MATM-4-MACFLAP_NOTIF: Host 201a.06f7.a482 in vlan 40 is flapping between port Fa0/1 and port Fa0/7
18:56:54: %SW_MATM-4-MACFLAP_NOTIF: Host 3c97.0e53.cdf3 in vlan 40 is flapping between port Fa0/1 and port Fa0/6
18:57:08: %SW_MATM-4-MACFLAP_NOTIF: Host 3c97.0e53.cdf3 in vlan 40 is flapping between port Fa0/1 and port Fa0/6
19:07:30: %SW_MATM-4-MACFLAP_NOTIF: Host 3c97.0e53.cdf3 in vlan 40 is flapping between port Fa0/1 and port Fa0/6
19:08:36: %SW_MATM-4-MACFLAP_NOTIF: Host 3c97.0e53.cdf3 in vlan 40 is flapping between port Fa0/1 and port Fa0/6
19:08:42: %SW_MATM-4-MACFLAP_NOTIF: Host 3c97.0e53.cdf3 in vlan 40 is flapping between port Fa0/6 and port Fa0/1
19:10:18: %SW_MATM-4-MACFLAP_NOTIF: Host 3c97.0e53.cdf3 in vlan 40 is flapping between port Fa0/1 and port Fa0/6
19:15:54: %SW_MATM-4-MACFLAP_NOTIF: Host 3c97.0e53.cdf3 in vlan 40 is flapping between port Fa0/1 and port Fa0/6
19:16:01: %SW_MATM-4-MACFLAP_NOTIF: Host 3c97.0e53.cdf3 in vlan 40 is flapping between port Fa0/1 and port Fa0/6
19:17:27: %SW_MATM-4-MACFLAP_NOTIF: Host 3c97.0e53.cdf3 in vlan 40 is flapping between port Fa0/1 and port Fa0/6

 

8 REPLIES
Hall of Fame Super Gold

%SW_MATM-4-MACFLAP_NOTIF:

%SW_MATM-4-MACFLAP_NOTIF: Host 3c97.0e53.cdf3 in vlan 40 is flapping between port Fa0/1 and port Fa0/6

This error log means there is a wired client in your network that's running on VLAN 40.  The wired clients is connected to TWO (2) ports of your switch and NOT in an EtherChannel.  

 

To fix this problem, you have two choices: 

1.  Unpatch or disable either ports Fa0/1 or Fa0/6; or

2.  Configure EtherChannel on Fa0/1 & Fa0/6.  Enable NIC Teaming on the wired client side.

Silver

Do what Leo does QUICKLY! or

Do what Leo does QUICKLY! or you'll be in a LOOP, loops not good in network infra xD
99% CPU anyone? xD

Though seriously, do what Leo said pronto! 

Hi , Can you share me show

Hi ,

 Can you share me show cdp neigbhors output from your cisco switch , likely mac resembles Intel as vendor , have you connected single server to two different switch ??

 

AC7BA1Intel Corporate

 

HTH

Sandy

 

 

 

 

New Member

Hi, Follow these steps to

Hi,

 

Follow these steps to resolve your problem:

1. Remove the connection between both switches.

2. delete flash vlan.dat     //use this command to completely remove VLAN

3. write erase reload     //use this command to reload

4. Now create trunk on both sides

5. show vlan    //use this command and check that trunk port is not shown here

Now connect both switches.

 

 

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Silver

With all due respect Jerry,

With all due respect Jerry, 

That troubleshooting step is not very good.
Are you trying to bring down their network?

Hi Begad, 
Just follow Leo's advise. 
Jerry's advise is making you restore to default the device.

Hall of Fame Super Gold

Follow these steps to resolve

Follow these steps to resolve your problem:
1. Remove the connection between both switches.
2. delete flash vlan.dat     //use this command to completely remove VLAN
3. write erase reload     //use this command to reload
4. Now create trunk on both sides
5. show vlan    //use this command and check that trunk port is not shown here
Now connect both switches.

WTF, mate.  Have you gone bonkers or something?  Y'call that a solution?  

Silver

​That's what I saidYeap! + +

​That's what I said
Yeap! + + + +  to this 

New Member

put output config port trunk

put output config port trunk please!

 

this is the trunk port?!?

flapping between port Fa0/1 and port Fa0/6

flapping between port Fa0/1 and port Fa0/7

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