To change, use below command- Cisco-SW(config)#mac address-table aging-time ?Ĭisco-SW(config)#mac address-table aging-time 500 ? You can check using “ show mac address-table aging-time” command and change it as per your requirement. There is another important thing you need to know to manage mac address table, which is aging time. SW3show mac-address-table Mac Address Table - Vlan Mac Address Type Ports - All STATIC CPU All STATIC CPU All 0180.c200.0000 STATIC CPU All 0180.c200.0001 STATIC CPU All 0180.c200.
Total Mac Addresses for this criterion: 4 In this example, the mac address table is displayed for SW3. If you want to check mac address for a particular port number, then you can use “ show mac address-table interface ” Cisco-SW#show mac address-table vlan 1 Total Mac Addresses for this criterion: 1 Cisco-SW#show mac address-table address 0050.7966.6800 If you know the specific mac address, then you can use below command to check mac address entry for that address using “ show mac address-table address “.
First of all checking the mac address table by using “ show mac address-table“. (ETA: What if you can't get to the Console port? How do you get the IP address of the switch in order to SSH or (if you must) Telnet in?)Ĭouldn't you just use CDP? #show cdp nei detail will show you the ip of the connected devices.To manage mac address table, we need to know a couple of commands in Cisco Catalyst switches. Which command displays the encapsulation type, the voice VLAN ID, and the access mode VLAN for the Fa0/1 interface show vlan brief show interfaces Fa0/1 switchport show mac address-table interface.
The amazing thing to me is, this far into the 21st Century, this is still the only way I could find to get this information - i.e.Also, 'sh ip arp | i 0/24' will show just the MAC address(es) on that port.) If you're all Cisco, 'show cdp neighbor' (or 'sh cdp nei') will get you to the next switch. (Small tip: When you see a large number of MAC addresses showing up on a single port, there's a switch on that port into which those MAC addresses are connected. The ports have been added to the default VLAN and show up everywhere else as normal, in the config and with show interfaces. It helps to Ping the subnet's broadcast address (e.g. show ethernet-switching table The results show only interfaces for the Virtual Chassis master, although there are some ports connected on the VC slave. Use the interface slot/port parameter to view MAC addresses on a specific interface. Enter the count parameter to view summary information about the forwarding database table. Enter a MAC Address and VLAN ID to display the table entry for the requested MAC address on the specified VLAN. consoleshow mac address-table vlan 30 Flags: I - Internal usage VLAN Aging time is 300 sec Vlan Mac Address Port Type- 30 XX:XX:XX:XX:XX:XX gi1/0/1 dynamic consoleshow mac address-table interface GigabitEthernet 1/0/1 In the below example, we are. Enter all or no parameters to display the entire table.
A MAC address entry contains the destination MAC address, VLAN ID, outbound interface, and entry type. In the below example, we are viewing the mac address listed under vlan 30. :^D After beating Google to death over it, hoping for some useful tool, I ended up using exactly the same process (plus the online MAC address lookup to ID the device manufacturer), so I can affirm this works perfectly, if you work it.Īs you can see, the 'sh arp' or 'sh ip arp' commands also give you the MAC addresses, so essentially the 'sh mac add' is only to get the port in which the device is connected. The display mac-address command displays all MAC address entries, such as dynamic MAC address entries, static MAC address entries, and blackhole MAC address entries. Thanks for posting this *after* I finished a "What's Connected Where" jihad on our network.
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