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39.3 The Number Limitation
Function of MAC in Port Typical
Examples
The Number Limitation of MAC in Port Typical Configuration Example
In the network topology above, SWITCH B connects to many PC users, before enabling the
number limitation function of MAC, if the system hardware has no other limitation, SWTICH A
and SWTICH B can get the MAC list entries of all the PC, so limiting the MAC list entry can
avoid DOS attack to a certain extent. When malicious users frequently do MAC cheating, it will
be easy for them to fill the MAC list entries of the switch, causing successful DOS attacks.
Limiting the MAC list entry can prevent DOS attack.
On port 1/1 of SWITCH A, set the max number can be learnt of dynamic MAC address as 20.
SWITCH A configuration task sequence:
Switch (config)#interface ethernet 1/1
Switch (Config-If-Ethernet1/1)#switchport mac-address dynamic maximum 20
39.4 The Number Limitation
Function of MAC in Port
Troubleshooting Help
The number limitation function of MAC in Port is disabled by default, if users need to limit the
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