Cisco ASA 5505 User Manual
Page 240
5-40
Cisco ASA 5500 Series Configuration Guide using the CLI
Chapter 5 Configuring Multiple Context Mode
Feature History for Multiple Context Mode
Maximum contexts increased for the ASA 5550
and 5580
8.4(1)
The maximum security contexts for the ASA 5550 was
increased from 50 to 100. The maximum for the ASA 5580
was increased from 50 to 250.
Automatic generation of a MAC address prefix
for the mac-address auto command
8.6(1)
In multiple context mode, the ASA now converts the
automatic MAC address generation configuration to use a
default prefix. The ASA auto-generates the prefix based on
the last two bytes of the interface MAC address. This
conversion happens automatically when you reload, or if
you reenable MAC address generation. The prefix method
of generation provides many benefits, including a better
guarantee of unique MAC addresses on a segment. You can
view the auto-generated prefix by entering the show
running-config mac-address command. If you want to
change the prefix, you can reconfigure the feature with a
custom prefix. The legacy method of MAC address
generation is no longer available.
Note
To maintain hitless upgrade for failover pairs, the
ASA does not convert the MAC address method in
an existing configuration upon a reload if failover is
enabled. However, we strongly recommend that you
manually change to the prefix method of generation
when using failover. After upgrading, to use the
prefix method of MAC address generation, reenable
MAC address generation to use the default prefix.
We modified the following command: mac-address auto.
Table 5-5
Feature History for Multiple Context Mode (continued)
Feature Name
Platform
Releases
Feature Information