08-17-2012 03:05 AM - edited 03-07-2019 08:24 AM
Hello Expert
I have 2 C6500 in hsrp environment.
Problem description
C6500-A------------------------------> C6500-B, with C6500-A the active hsrp , and C6500-B the stdby
C6500-A#sh mac address-table count
MAC Entries for all vlans :
Dynamic Address Count: 1600
Static Address (User-defined) Count: 400
Total MAC Addresses In Use: 2000
Total MAC Addresses Available: 65536
C6500-B#sh mac address-table count
MAC Entries for all vlans :
Dynamic Address Count: 3698
Static Address (User-defined) Count: 338
Total MAC Addresses In Use: 4036
Total MAC Addresses Available: 65536
I 'd like to know why the numbers in C6500-B doubles those in C6500-A?
Is it normal?
In addition, in vlan 225, I see there are 65 mac entries in C6500-B , and 42 in C6500-A.
Could you provide me an explanation.I thought the mac entries should have the same.
Thank u in advance.
Alioune
08-20-2012 09:31 PM
Hi Alioune,
It is not nesscessary to see the same number of MAC address count when you config the HSRP b/t two switches. It is normal that we can see this different count on MAC address.
when you see the #show mac-address-table count, we can see the mac entries for all the vlans configured on the switch
On switch C6500-B,
we can see the Dynamic address count showing as 3698, you can verify below commands
#show mac-address-table module <module number> - shows from which interface, the respective MAC addresses learnt
#show mac-address-table vlan <vlan number> - shows the number of mac addresses from vlan perspective
1. did you verify the logs on the switch C6500-B, did you see any L2 change happend on this switch?
2. please check the #show spanning-tree detail | in executing|changes|from and verify the stability of the spanning-tree topology
3. Did you check the mac-address-count on other vlan apart from 225, do you see the same behavior?
Regards,
Aru
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