I am new to this type of switch and installing the switch i came across the issue that the mac address table is not populated.
#SH MAC ADdress-table LEarning
Learning disabled on vlans:
Do you need how to activate mac learning which seems not activated by default ?
Thanks for the reply.
Do you know the document for activating the mac learning on the switch please ? I cannot find the documentation for the security feature
Difficult to troubleshoot without access to the mac address table.
Its disabled on all most switches by default not just 9ks , 3ks and 4ks are the same , its protecting the switch you dont need it to troubleshoot layer 2 macs , you just use the command show mac address-table to see the full mac add table or show mac address-table address H.H.H
if you want to turn it on its per specific vlan --- mac address-table learning ?
vlan MAC Address table learning per VLAN
You could cause issues disabling it , its not really recommended
Disabling MAC Address Learning on an Interface or VLAN
By default, MAC address learning is enabled on all interfaces and VLANs on the router. You can control MAC address learning on an interface or VLAN to manage the available MAC address table space by controlling which interfaces or VLANs can learn MAC addresses. Before you disable MAC address learning, be sure that you are familiar with the network topology and the router system configuration. Disabling MAC address learning on an interface or VLAN could cause flooding in the network.
For the specific doc for your software release will be its config guide, there is a link to it where you download the image on the Cisco website , like example below
Thanks for the reply and it makes sense but on the switch.
SW_NETCENTRE_VNX_FRONTEND#sh mac address-table
Mac Address Table
Vlan Mac Address Type Ports
---- ----------- -------- -----
All 0100.0ccc.cccc STATIC CPU
All 0100.0ccc.cccd STATIC CPU
All 0180.c200.0000 STATIC CPU
All 0180.c200.0001 STATIC CPU
All 0180.c200.0002 STATIC CPU
All 0180.c200.0003 STATIC CPU
All 0180.c200.0004 STATIC CPU
All 0180.c200.0005 STATIC CPU
All 0180.c200.0006 STATIC CPU
All 0180.c200.0007 STATIC CPU
All 0180.c200.0008 STATIC CPU
All 0180.c200.0009 STATIC CPU
All 0180.c200.000a STATIC CPU
All 0180.c200.000b STATIC CPU
All 0180.c200.000c STATIC CPU
All 0180.c200.000d STATIC CPU
All 0180.c200.000e STATIC CPU
All 0180.c200.000f STATIC CPU
All 0180.c200.0010 STATIC CPU
All 0180.c200.0021 STATIC CPU
All ffff.ffff.ffff STATIC CPU
1 dc8c.37a4.48c7 STATIC Vl1
Total Mac Addresses for this criterion: 22
But I am not seeing other mac addresses while I have got the interfaces up on vlan 1 and operational for example.
The version is 16.10.1.
Check these Bugs.
CSCvn72251 Interface counters/Mac learning does not work after diagnostic test in 9200 and 9200L
CSCvt22238 C9200L/C9200 : Interface counter/MAC learning/MAC ageing does not work/ 32 prefix stuck
I spent hours reviewing and researching options, fixed by rebooting switch. Now I need to see if the issue is going to return and then schedule an update if needed (currently running the Fuji release 16.9 I believe).