Mac address table aging time

Cisco Nexus 3000 Series NX-OS Layer 2 Switching Configuration Guide, Release 5.0(3)U2(1)
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  • Setting the Aging Time for Dynamic Entries.
  • EOS Section 18.3: MAC Address Table.

The MAC table aging process ensures that a router tracks only active MAC addresses on the network and is able to flush out address that are no longer used. This configuration can influence efficiency of network resource use by affecting the amount of traffic that is flooded to all interfaces because when traffic is received for MAC addresses no longer in the Ethernet routing table, the router floods the traffic to all interfaces.

Depending on how long you want to keep a MAC address in a MAC table before it expires, you can either increase or decrease the aging timer. You cannot modify the timeout interval for a virtual switch.

Information About MAC Addresses

Behavior of Tagged Packets. Important Points to Remember. Configuring S,G Expiry Timers. Disabling Multicast Flooding. Configuring a Switch for NLB. A longer aging time makes the switch more insensitive to network changes and is only applicable to stable networks.

The timeout interval applies only to dynamically learned MAC addresses. But that could be switch on to remove and add PC's on a secure port without manually deleting the existing secure mac addresses while still limit the number of secure addresses on port. Network Feb 10 '17 at If I turn on port security and configure it with the following; the maximum number of mac addresses to 1, the violation mode to protect, the ageing time to 10 minutes.

Dell Configuration Guide for the S4048–ON System 9.9(0.0)

If in the future I replace the device on the switchport. Will the new devices packets be dropped?

If so would I have to configure the switch to accept the new mac address and drop the old mac address? Would I need to wait 10 minutes? Not really, for automatic recovery of errdisabled port you need to use errdisable recovery cause security-violation Ageing time would just remove mac address from port if after timer expires no mac is currently present on port, it won't enable already disabled port.


So it would not happen automatically and I would have to configure it? Even with protected violation mode?

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