10-12-2011 09:50 PM
Can anybody comment this:
sw-bbone(config)#vlan 1811
sw-bbone(config-vlan)#end
% Applying VLAN changes may take few minutes. Please wait...
sw-bbone#sh mac-address-table count
MAC Entries for all vlans :
Dynamic Address Count: 28633
Static Address (User-defined) Count: 984
Total MAC Addresses In Use: 29617
Total MAC Addresses Available: 65536
sw-bbone(config)#no vlan 1811
% Applying VLAN changes may take few minutes. Please wait...
sw-bbone#sh mac-address-table count
MAC Entries for all vlans :
Dynamic Address Count: 4354
Static Address (User-defined) Count: 981
Total MAC Addresses In Use: 5335
Total MAC Addresses Available: 65536
Is it a normal Cat behavior to flush full CAM when just one Vlan gets removed?
System image file is "sup-bootflash:s72033-ipservicesk9-mz.122-33.SXH2a.bin"
Solved! Go to Solution.
10-24-2011 05:25 AM
Hi,
I think what you see it is expected.
How many trunk ports carrying vlan 1811 do you have on your cat6500 (after you add the vlan in the db)?
Current hw (EARL7) has a limitation for which when a vlan is removed from a trunk (this also happens when you delete the vlan from the db as that vlan must be withdrawn from all trunks carrying it) all the dynamic mac addresses IN ALL VLANS are deleted from the trunk ports. This seems to match what you saw. After deletion of vlan 1811 the dynamic mac count dropped from 28k to 4k. I suppose that about 24k are learnt on trunk ports allowing all vlans (hence vlan 1811 too).
Riccardo
10-14-2011 02:38 AM
Can you share the output of following sequence of commands:
sh mac-address-table count
show mac-address-table count vlan 1811
no vlan 1811
sh mac-address-table count
10-14-2011 02:51 AM
It's a new vlan without any MACs inside. I created it just before issuing count commands in my previous example:
sw-bbone(config)#vlan 1811
sw-bbone(config-vlan)#end
10-18-2011 07:01 AM
Same problem has been spotted on ME6524
sw-bbone5#sh ver
Cisco Internetwork Operating System Software
IOS (tm) s6523_rp Software (s6523_rp-ADVIPSERVICESK9-M), Version 12.2(18)ZU2, RELEASE SOFTWARE (fc2)
sw-bbone5#sh mac-address-table count
MAC Entries for all vlans :
Dynamic Address Count: 8963
Static Address (User-defined) Count: 208
Total MAC Addresses In Use: 9171
Total MAC Addresses Available: 98304
sw-bbone5#sh mac-address-table count vlan 1811
MAC Entries for Vlan 1811 :
Dynamic Address Count: 0
Static Address (User-defined) Count: 0
Total MAC Addresses In Use: 0
Total MAC Addresses Available: 98304
sw-bbone5(config)#no vlan 1811
sw-bbone5(config)#exit
sw-bbone5#sh mac-address-table count
MAC Entries for all vlans :
Dynamic Address Count: 2315
Static Address (User-defined) Count: 207
Total MAC Addresses In Use: 2522
Total MAC Addresses Available: 98304
10-24-2011 05:25 AM
Hi,
I think what you see it is expected.
How many trunk ports carrying vlan 1811 do you have on your cat6500 (after you add the vlan in the db)?
Current hw (EARL7) has a limitation for which when a vlan is removed from a trunk (this also happens when you delete the vlan from the db as that vlan must be withdrawn from all trunks carrying it) all the dynamic mac addresses IN ALL VLANS are deleted from the trunk ports. This seems to match what you saw. After deletion of vlan 1811 the dynamic mac count dropped from 28k to 4k. I suppose that about 24k are learnt on trunk ports allowing all vlans (hence vlan 1811 too).
Riccardo
10-24-2011 06:11 AM
Dear Riccardo,
Thanks for your help. We have many trunk ports without VLAN filters on them.
It makes sence now.
10-24-2011 06:30 AM
Just curious, can you please provide a sample list of switches with a new hardware.
For example ME6524 is quite a new switch and still running EARL7?
10-24-2011 06:47 AM
Well, ME6524 is not so new (actually I would say the contrary) and since it is PFC3C based it has the same EARL7 as other cat6500 supervisors.
On Cat6500 only the new Sup2T has EARL8.
The other platform using it is the Nexus 7K.
Please rate the question if you are happy with it
Riccardo
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