Cisco Systems ASA5515K9, ASA 5500 Automatically Assigning MAC Addresses to Context Interfaces

5-22
Cisco ASA 5500 Series Configuration Guide using the CLI
Chapter5 Configuring Multiple Context Mode
Configuring Multiple Contexts
Examples
The following example sets the admin context to be “administrator,” creates a context called
“administrator” on the internal flash memory, and then adds two contexts from an FTPserver:
hostname(config)# admin-context administrator
hostname(config)# context administrator
hostname(config-ctx)# allocate-interface gigabitethernet0/0.1
hostname(config-ctx)# allocate-interface gigabitethernet0/1.1
hostname(config-ctx)# config-url flash:/admin.cfg
hostname(config-ctx)# context test
hostname(config-ctx)# allocate-interface gigabitethernet0/0.100 int1
hostname(config-ctx)# allocate-interface gigabitethernet0/0.102 int2
hostname(config-ctx)# allocate-interface gigabitethernet0/0.110-gigabitethernet0/0.115
int3-int8
hostname(config-ctx)# config-url ftp://user1:passw0rd@10.1.1.1/configlets/test.cfg
hostname(config-ctx)# member gold
hostname(config-ctx)# context sample
hostname(config-ctx)# allocate-interface gigabitethernet0/1.200 int1
hostname(config-ctx)# allocate-interface gigabitethernet0/1.212 int2
hostname(config-ctx)# allocate-interface gigabitethernet0/1.230-gigabitethernet0/1.235
int3-int8
hostname(config-ctx)# config-url ftp://user1:passw0rd@10.1.1.1/configlets/sample.cfg
hostname(config-ctx)# member silver
Automatically Assigning MAC Addresses to Context Interfaces
This section describes how to configure auto-generation of MAC addresses.
The MAC address is used to classify packets within a context. See the “Information About MAC
Addresses” section on page5-11 for more information, especially if you are upgrading from an earlier
ASA version. See also the “Viewing Assigned MAC Addresses” section on page5-35.
Guidelines
•When you configure a nameif command for the interface in a context, the new MAC address is
generated immediately. If you enable this feature after you configure context interfaces, then MAC
addresses are generated for all interfaces immediately after you enable it. If you disable this feature,
the MAC address for each interface reverts to the default MAC address. For example, subinterfaces
of GigabitEthernet 0/1 revert to using the MAC address of GigabitEthernet 0/1.
•In the rare circumstance that the generated MAC address conflicts with another private MAC
address in your network, you can manually set the MAC address for the interface within the context.
See the “Configuring the MAC Address and MTU” section on page 8-9 to manually set the MAC
address.