Cisco switch reset mac address table

The site confirmed that there was no re-patching of the device. Even if there was any re-patch, I would expect after 1 minutes the mac would clear from the previous interface.

Cisco Nexus 1000V Layer 2 Switching Configuration Guide, Release 4.2(1)SV2(2.1)

Is it caused by Cisco bug? Hi just because a mac was learnt in by 2 different ports on same device should not take it offline , I would have thought the timer may reset but that's about it , macs will often be learnt in by more than one port as they can be broadcast out and there may be multiple uplinks on the switches.


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We have been noticing some issues with a site having few critical devices. Not from the other core switch which was HSRP active that point.

Nope, I could not check the ARP entry that time. I was trying to clear the MAC entry from the wrong edge port and issue resolved as soon as it was done!

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Hi sorry what I meant was ip duplication for that particular mac address , if the ip is attached to that mac by dhcp and someone has also statically assigned it to device causing duplication and mac been seen as if its originating from 2 places due to the incorrect config at network layer like below extract had an issue like it other day. Are these hosts connected through an IP phone? If so, you can get problems with port security when you move the host. The original port is kept "up" by the phone, and so the security entry is not cleared down until is ages out. When you plug the host into the new port you get that ambiguity, and likely an err-disable.

For the same reason it is not a good idea to put port security on a distribution switch. Port security should be on the edge ports only. The hosts are not connected through IP phones. They are like huge devices used for conveyor belts. Find A Community.

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The ARP table on a Cisco router

All community This category This board. Cisco Community : Technology and Support : Networking : Switching : mac-address-table aging-time and port s Hi all, Appreciate your help on this. There are few things I would like to understand. Core-switch show mac-address-table aging-time Vlan Aging Time Global no vlan age other than global age configured Routed MAC aging time: seconds What is the significance of , here? Labels: Other Switching. I have this problem too. Accepted Solutions. Mark Malone. VIP Mentor. To delete the static entry from the MAC address table, enter the no form of the command.

How to clear the mac address table on a - Cisco Community

You can use the mac-address-table static command to assign a static MAC address to a virtual interface. You can configure the amount of time that an entry the packet source MAC address and port that packet ingresses remain in the MAC table. To configure the aging time for all MAC addresses, perform this task:. Specifies the time before an entry ages out and is discarded from the MAC address table. The range is from 0 to ; the default is seconds. Entering the value 0 disables the MAC aging.


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This example shows how to set the aging time for entries in the MAC address table to seconds 10 minutes :. You can clear all dynamic entries in the MAC address table. To clear the MAC address table, perform this task:. Clears the dynamic address entries from the MAC address table.

This example shows how to clear the dynamic entries in the MAC address table:.

5.2.1.7 Lab - Viewing the Switch MAC Address Table

To display MAC address configuration information, perform one of these tasks:. This example shows how to display the MAC address table:. This example shows how to display the current aging time:.

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Information About MAC Address Tables

Find Matches in This Book. PDF - Complete Book 4. Updated: May 7, This example shows how to put a static entry in the MAC address table: switch configure terminal switch config mac-address-table static 12ab.