Configuring and Monitoring Port Security
MAC Lockout
MAC Lockout overrides MAC Lockdown, port security, and 802.1X authenti-
cation.
You cannot use MAC Lockout to lock:
• Broadcast or Multicast Addresses (Switches do not learn these)
• Switch Agents (The switch’s own MAC Address)
There are limits for the number of VLANs, Multicast Filters, and Lockout
MACs that can be configured concurrently as all use MAC table entries. The
limits are shown below.
Table 13-1. Limits on Lockout MACs
# VLANs # Multicast Filters # Lockout MACs
< = 1024 16 16
1025-2048 8 8
If someone using a locked out MAC address tries to send data through the
switch a message is generated in the log file:
Lockout logging format:
W 10/30/03 21:35:15 maclock: module A: 0001e6-1f96c0
detected on port A15
W 10/30/03 21:35:18 maclock: module A: 0001e6-1f96c0
detected on port A15
W 10/30/03 21:35:18 maclock: module A: Ceasing lock-out
logs for 5m
As with MAC Lockdown a rate limiting algorithm is used on the log file so that
it does not become overclogged with error messages. (Refer to “Limiting the
Frequency of Log Messages” on page 13-25.)
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