Contents
How do I reset my MAC address table?
To remove a specified address (or set of addresses) from the MAC address table, use the clear mac-address-table command in privileged EXEC mode.
How do I examine a MAC address table on a switch?
Part 2: Examine the Switch MAC Address Table
- Step 1: Record network device MAC addresses.
- Step 2: Display the switch MAC address table.
- Step 3: Clear the S2 MAC address table and display the MAC address table again.
- Step 4: From PC-B, ping the devices on the network and observe the switch MAC address table.
How do I change the MAC address on a Cisco switch?
In Cisco 2940, and 2950/2955 series switches you can change the MAC address of switch ports using the command mac-address, under the interface configuration mode.
How do you clear a MAC address?
Select Configuration > Security > Basic > MAC ACL. The basic MAC Authentication screen displays. In the Selected Wireless Clients list, select the check boxes that correspond to the MAC addresses that you want to remove. Click the Delete button.
How does the MAC address table work on a switch?
When the switch receives a frame, it associates the media access control (MAC) address of the sending network device with the LAN port on which it was received. The switch dynamically builds the address table by using the MAC source address of the frames received.
Why does a switch not learn a MAC address?
A switch will not learn a MAC address if it doesn´t receive any packet from the host. I´m curious on why it is not receiving any packets, I´ve seen this in a load-balancing configuration on the NICs (on servers for example, one NIC receives packets and the other NIC sends) but since this is a workstation I really doubt this is the cause.
How can I find the MAC address of my switch?
For example, to find the port on which the switch learns a MAC address of 080009-21ae84: This feature lets you determine which switch port on a selected VLAN is being used to communicate with a specific device on the network. From the Main Menu, select:
Why is the MAC address not captured on Switch ports?
In particular, if you unplug that attached host and then plug it in again, the MAC address disappears again. I get the same result by changing the VLAN and then changing it back, or by shutting down the port and then bringing it back up. 03-20-2012 08:23 AM 03-20-2012 08:23 AM I’ve recently experienced the same issue on a 3750 stack.