Cisco ASA Series Cli Configuration Manual page 262

Feature History for Multiple Context Mode
Table 1-5 Feature History for Multiple Context Mode (continued)
Feature Name
Automatic generation of a MAC address prefix 8.6(1)
Dynamic routing in Security Contexts
New resource type for routing table entries
Cisco ASA Series CLI Configuration Guide
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Platform
Releases Feature Information
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 (ASA 5500) or backplane
(ASASM) 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, especially for the ASASM.
Without the prefix method, ASASMs installed in
different slot numbers experience a MAC address
change upon failover, and can experience traffic
interruption. 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.
9.0(1) EIGRP and OSPFv2 dynamic routing protocols are now
supported in multiple context mode. OSPFv3, RIP, and
multicast routing are not supported.
9.0(1) A new resource type, routes, was created to set the
maximum number of routing table entries in each context.
We modified the following commands: limit-resource,
show resource types, show resource usage, show
resource allocation.
Chapter 1 Configuring Multiple Context Mode