Mac address table flush of dynamic entries

However, this function takes no effect on the static MAC addresses. You can configure add or modify the MAC address entries manually according to the actual networking environment.

The entries can be static ones or dynamic ones. Administrators can manually add, modify, or delete the entries in MAC address table according to the actual needs. They can also delete all the unicast MAC address table entries related to a specified port or delete a specified type of entries, such as dynamic entries or static entries.

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Perform the following configuration in system view, as listed in Table The setting of an appropriate aging time can effectively implement the function of MAC address aging. Too long or too short aging time set by subscribers will cause the problem that the NX broadcasts a great mount of data packets without MAC addresses, which will affect the NX operation performance. If aging time is set too long, the NX will store a great number of out-of-date MAC address tables. If aging time is set too short, the Ethernet switch may delete valid MAC address table.

In addition, this command takes effect on all the ports. However the address aging only functions on the dynamic addresses the learned or configured as age entries by the user.

Table Of Contents

By default, the aging-time is seconds. After I show you how to clear the ARP cache, I will show you how to manage that cache with a few command switches.

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The above command will flush the entire ARP cache on your system. Now as soon as network connections are made, the ARP cache will begin to repopulate.

Understanding Persistent MAC Learning (Sticky MAC)

Once you have flushed the ARP cache, make sure to issue the command arp -a to see if the cache has, in fact, been flushed. If it does not flush, it could be the system is a victim of a Windows bug caused when Routing and Remote Services is enabled. This is a simple bug to fix:.

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It is also possible to troubleshoot network connections using the ARP cache. If one such entry shows up, make sure to delete it from the cache using the -d switch. Say you have an ARP entry that looks like:. As an alternative to using persistent MAC learning with MAC limiting, you can statically configure each MAC address on each port or allow the port to continuously learn new MAC addresses after restarts or interface-down events.

Allowing the port to continuously learn MAC addresses represents a security risk.


Solved: can't clear mac address table from inte - Cisco Community

While a switch is restarting or an interface is coming back up, there might be a short delay before the interface can learn more MAC addresses. This delay occurs while the system re-enters previously learned persistent MAC addresses into the forwarding database for the interface. Interfaces must be configured in access mode use the port-mode configuration statement or, for switches operating on the Enhanced Layer 2 Software ELS configuration style, the interface-mode configuration statement.

You cannot enable persistent MAC learning on an interface on which You cannot enable persistent MAC learning on an interface that is part of a redundant trunk group.

How do I clear the MAC address table on Enterasys?

You cannot enable persistent MAC learning on an interface on which no-mac-learning is enabled. If you move a device within your network that has a persistent MAC address entry on the switch, use the clear ethernet-switching table command to clear the persistent MAC address entry from the interface. If you move the device and do not clear the persistent MAC address from the original port it was learned on, then the new port will not learn the MAC address of the device and the device will not be able to connect.

If the original port is down when you move the device, then the new port will learn the MAC address and the device can connect.