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Cisco ASA 5500 Series Configuration Guide using ASDM
Chapter 12 Starting Interface Configuration (ASA 5510 and Higher)
Monitoring Interfaces
You return to the Interfaces pane.
What to Do Next
(Optional) For the ASA 5580 and 5585-X, enable jumbo frame support according to the “Enabling
Jumbo Frame Support (Supported Models)” section on page 12-38.
Enabling Jumbo Frame Support (Supported Models)
A jumbo frame is an Ethernet packet larger than the standard maximum of 1518 bytes (including Layer
2 header and FCS), up to 9216 bytes. You can enable support for jumbo frames for all interfaces by
increasing the amount of memory to process Ethernet frames. Assigning more memory for jumbo frames
might limit the maximum use of other features, such as access lists.
Supported models include:
• ASA 5512-X
• ASA 5515-X
• ASA 5525-X
• ASA 5545-X
• ASA 5555-X
• ASA 5580
• ASA 5585-X
Prerequisites
• In multiple context mode, set this option in the system execution space.
• Changes in this setting require you to reload the ASA.
• Be sure to set the MTU for each interface that needs to transmit jumbo frames to a higher value than
the default 1500; for example, set the value to 9000. See the “Configuring the MAC Address and
MTU” section on page 14-12. In multiple context mode, set the MTU within each context.
Detailed Steps
• Multiple mode—To enable jumbo frame support, choose Configuration > Context Management
> Interfaces, and click the Enable jumbo frame support check box.
• Single mode—Setting the MTU larger than 1500 bytes automatically enables jumbo frames. To
manually enable or disable this setting, choose Configuration > Device Setup > Interfaces, and
click the Enable jumbo frame support check box.
Monitoring Interfaces
This section includes the following topics:
• ARP Table, page 12-39
• MAC Address Table, page 12-39