Understanding Mac Security; Secure Mac Addresses; Security Violations - Cisco 3845 - Security Bundle Router Software Manual

Chapter 19 Configuring Traffic Control
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Understanding MAC Security

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Secure MAC Addresses

You configure the maximum number of secure addresses allowed on an EFP by using the mac security
maximum address value service instance configuration command.
If you try to set the maximum value to a number less than the number of static or sticky secure addresses
Note
already configured on a secure EFP, the command is rejected. If the number of static or sticky secure
addresses configured on a secure EFP is less than the new maximum value, the command is accepted and
dynamic secure addresses may get deleted to satisfy maximum number of secure address.
The switch supports these types of secure MAC addresses:
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The sticky secure MAC addresses do not automatically become part of the configuration file, which is
the startup configuration used each time the switch restarts. If you save the sticky secure MAC addresses
in the configuration file, when the switch restarts, the interface does not need to relearn these addresses.
If you do not save the sticky secure addresses, they are lost.
If sticky learning is disabled, the sticky secure MAC addresses are removed from both address table and
the running configuration.
You can set the maximum number of secure MAC addresses that you can configure on a bridge domain
is determined by using the mac limit max addresses bridge-domain configuration command. The range
is 1 to 10000.

Security Violations

It is a security violation when one of these situations occurs:
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OL-23400-01
MAC Address Security Guidelines, page 19-9
Enabling and Configuring EVC MAC Security, page 19-9
Secure MAC Addresses, page 19-7
Security Violations, page 19-7
Static secure MAC addresses—These are manually configured by using the mac security address
permits mac-address service instance configuration command. Static secure MAC addresses are
stored in the address table and added to the switch running configuration.
Dynamic secure MAC addresses—These are dynamically learned, stored only in the address table,
and removed when the switch restarts.
Sticky secure MAC addresses—These can be dynamically learned or manually configured, stored in
the address table, and added to the running configuration. If these addresses are saved in the
configuration file, when the switch restarts, the service instance does not need to dynamically
reconfigure them.
The maximum number of secure MAC addresses for a secure EFP have been added to the address
table, and a station whose MAC address is not in the address table attempts to access the EFP.
An address learned or configured on one secure EFP is seen on another secure EFP in the same
bridge domain.
Cisco ME 3800X and 3600X Switch Software Configuration Guide
Configuring EVC MAC Security
19-7