Catalyst 3550: Troubleshoot flapping issue for mac 0201.0000.0000
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Posted by on June 3, 2008, 10:48 am
Please log in for more thread options at the core and several unmanaged switches of various manufacture outlying. In summary, SWITCH_01 sees it flapping across 5 interfaces; Gi0/2, Fa0/1, Fa0/4, Fa0/19, and Fa0/23. Fa0/1, 19, and 23 are servers. Fa0/2 is a crossover cable to SWITCH_02. Gi0/2 is fiber connected to SWITCH_10-Gi0/2. SWITCH_02 sees it flapping across two interfaces; Fa0/5 and Fa0/20. Fa0/5 is the crossover link to SWITCH_01. Fa0/20 is a crossover link to an unmanaged gigabit switch. SWITCH_10 sees this mac on two interfaces; Gi0/2 and Gi0/1. Gi0/1 is connected to SWITCH_M1-Gi0/2. Gi0/2 is the fiber link back to SWITCH_01. SWITCH_M1 sees it flapping across two interfaces; Gi0/2 and Fa0/9. Gi0/2 is the link to SWITCH_10. Fa0/9 is some device with an HP nic. Only SWITCH_01 and SWITCH_10 are logging MACFLAP errors even though SWITCH_02 and SWITCH_M1 are clearly seeing it flap: SWITCH_01>
%SW_MATM-4-MACFLAP_NOTIF: Host 0201.0000.0000 in vlan 1 is flapping
between port Gi0/2 and port Fa0/4 %SW_MATM-4-MACFLAP_NOTIF: Host 0201.0000.0000 in vlan 1 is flapping between port Fa0/1 and port Fa0/23 %SW_MATM-4-MACFLAP_NOTIF: Host 0201.0000.0000 in vlan 1 is flapping between port Fa0/19 and port Gi0/2 SWITCH_10>
%SW_MATM-4-MACFLAP_NOTIF: Host 0201.0000.0000 in vlan 1 is flapping
between port Gi0/1 and port Gi0/2 SWITCH_02>sho mac-addr addr 0201.0000.0000
Mac Address Table
------------------------------------------- Vlan Mac Address Type Ports ---- ----------- -------- ----- 1 0201.0000.0000 DYNAMIC Fa0/5 Total Mac Addresses for this criterion: 1 SWITCH_02>sho mac-addr addr 0201.0000.0000
Mac Address Table
------------------------------------------- Vlan Mac Address Type Ports ---- ----------- -------- ----- 1 0201.0000.0000 DYNAMIC Fa0/20 Total Mac Addresses for this criterion: 1 My questions are: a) What is this mac address 0201.0000.0000? b) How do I proceed with troubleshooting this problem? TIA and sorry for the long post. JM | |||||||||||||
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Posted by Sam Wilson on June 3, 2008, 11:01 am
Please log in for more thread options > My questions are:
> > a) What is this mac address 0201.0000.0000? > b) How do I proceed with troubleshooting this problem? > > TIA and sorry for the long post. Google for 0201.0000.0000, or one of the canonical representations, 02-01-00-00-00-00 or 02:01:00:00:00:00, say, and then work out which of your servers is trying to do load balancing. Sam | |||||||||||||
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Posted by on June 3, 2008, 11:32 am
Please log in for more thread options wrote:
> jmoseby_@_elasticfabrics.com wrote:
> >> My questions are:
>> >> a) What is this mac address 0201.0000.0000? >> b) How do I proceed with troubleshooting this problem? >> >> TIA and sorry for the long post. >
> >Google for 0201.0000.0000, or one of the canonical representations, >02-01-00-00-00-00 or 02:01:00:00:00:00, say, and then work out which of >your servers is trying to do load balancing. > >Sam Sam, Precicely the answer - thanks. I did do a lot of googling prior to posting this message, and found nothing. After I posted here, I googled '02:01:00' in an attempt to find out the manufacturer of the nic. I found the following enlightening page: http://www.velocityreviews.com/forums/t299846-cat-4003-issue.html which said: >The mac address in question is used by Windows 2000 Advanced server
>with Network Load Balancing. >To fix this, you could either turn off the load balancing feature.
>(which is not really network load balancing but server load balancing) >Or configure a static IP -> multicast mac address entry and turn on >igmp snooping or configure the multicast mac address to the ports which >are members of the load balancing group. >Im guessing there are seperate servers connected to the diffirent ports
>but that all of them are members of the load balancing group. In our case, we are not load balancing any servers, but whoever installed them installed load balancing on all of them (?). I have simply un-checked load balancing in the network config on each server the problem is solved. Thanks again! Jim | |||||||||||||
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