Cisco ASA 5505 - Manual (Page 274)

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Cisco ASA 5500 Series Configuration Guide using the CLI
Chapter 6 Starting Interface Configuration (ASA 5510 and Higher)
Starting Interface Configuration (ASA 5510 and Higher)
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 6-32 .
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 using the mtu command. See the
“Configuring
the MAC Address and MTU” section on page 8-9 . In multiple context mode, set the MTU within
each context.
Detailed Steps
Examples
The following example enables jumbo frame reservation, saves the configuration, and reloads the ASA:
hostname(config)# jumbo-frame reservation
WARNING: this command will take effect after the running-config is saved
and the system has been rebooted. Command accepted.
hostname(config)# write memory
Building configuration...
Command Purpose
jumbo-frame reservation
Example:
hostname(config)# jumbo-frame reservation
Enables jumbo frame support for the ASA 5580 and 5585-X. To disable
jumbo frames, use the no form of this command.