How to Configure Cisco 3560 for Jumbo Frames

Written by dave wilson
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How to Configure Cisco 3560 for Jumbo Frames
Jumbo frames are necessary to optimise the network throughput to large storage systems. (Kim Steele/Photodisc/Getty Images)

Cisco Catalyst network switch appliances, such as the Cisco 3560, comply with IEEE (Institute of Electrical and Electronics Engineers) Ethernet frame sizes by default by using 1500 byte frames (which is less than the 1518 byte maximum specified by the IEEE). However, if a Cisco 3560 will be used by enterprise class storage devices that require oversized frames, configure the Cisco 3560 to support the "Jumbo" frame sizes required by the storage system.

Skill level:
Moderate

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Things you need

  • Credentials of an Administrator account on the Cisco 3560 switch
  • Telnet configured on the Cisco 3560 switch
  • IP address of the Cisco 3560 switch
  • Windows 7 computer with the telnet client enabled
  • Enable password for the Cisco 3560 switch

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Instructions

  1. 1

    Click the "Start" button on the Windows 7 desktop taskbar and click "Programs" and then click "Accessories." Click the command line icon in the menu that appears. The command line window will display.

  2. 2

    Type "telnet a.b.c.d" at the command prompt except replace "a.b.c.d" with the IP address of the Cisco 3560 switch. Tap the "Enter" key.

  3. 3

    Type the telnet password at the command line when prompted and tap the "Enter" key. Type "enable" at the command prompt and press the "Enter" key.

  4. 4

    Enter the "enable" password at the command line when prompted and press the "Enter" key. Type "config terminal" at the command prompt and press the "Enter" key.

  5. 5

    Type "system mtu jumbo 9000" on the command line and tap the "Enter" key. Type "system mtu 1546" at the command line and press the "Enter" key. Type "exit" at the command line and press the "Enter" key.

  6. 6

    Type "reload" at the command prompt and press the "Enter" key.

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