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8-6
Cisco ASDM User Guide
OL-16647-01
Chapter 8 Configuring Interfaces in Multiple Mode
Configuring Interfaces in the System Configuration (Multiple Mode)
• Maximum Subinterfaces, page 8-6
Default State of Subinterfaces
When you add a subinterface, it is enabled by default. However, the physical or redundant interface must
also be enabled to pass traffic (see the “Configuring Physical Interfaces in the System Configuration
(Multiple Mode)” section on page 8-2 to enable physical interfaces. See the “Configuring Redundant
Interfaces in the System Configuration (Multiple Mode)” section on page 8-3 to enable redundant
interfaces).
Maximum Subinterfaces
To determine how many subinterfaces are allowed for your platform, see Appendix A, “Feature
Licenses.”
Adding a Subinterface in the System Configuration (Multiple Mode)
To add a subinterface and assign a VLAN to it, perform the following steps:
Step 1 If you are not already in the System configuration mode, in the Configuration > Device List pane,
double-click System under the active device IP address.
Step 2 On the Context Management > Interfaces pane, click Add > Interface.
Step 3 From the Hardware Port drop-down list, choose the physical interface to which you want to add the
subinterface.
Step 4 If the interface is not already enabled, check Enable Interface.
The interface is enabled by default. To disable it, uncheck the box.
Step 5 In the VLAN ID field, enter the VLAN ID between 1 and 4095.
Some VLAN IDs might be reserved on connected switches, so check the switch documentation for more
information. For multiple context mode, you can only set the VLAN in the system configuration.
Step 6 In the Subinterface ID field, enter the subinterface ID as an integer between 1 and 4294967293.
The number of subinterfaces allowed depends on your platform. You cannot change the ID after you set
it.
Step 7 (Optional) In the Description field, enter a description for this interface.
The description can be up to 240 characters on a single line, without carriage returns. For multiple
context mode, the system description is independent of the context description. In the case of a failover
or state link, the description is fixed as “LAN Failover Interface,” “STATE Failover Interface,” or
“LAN/STATE Failover Interface,” for example. You cannot edit this description. The fixed description
overwrites any description you enter here if you make this interface a failover or state link.
Step 8 Click OK.