Change AHV Host MTU for Jumbo Frames

  • 16 March 2020
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What is Jumbo frames? 

In computer networking, jumbo frames are Ethernet frames with more than 1500 bytes of payload, the limit set by the IEEE 802.3 standard. Jumbo frames can carry up to 9000 bytes of payload.


When should jumbo frames be used? 

Use jumbo frames only when you have a dedicated network or VLAN, and you can configure an MTU of 9000 on all equipment to increase performance.

A good general example of this approach is a separate SAN or storage network.


How to check your current MTU status?

Run this command on one of your CVMs “NCC Health Check: cvm_mtu_check”.

The command checks:

  • On Hyper-V, validates if the MTU size is properly defined for eth0 and eth1 on the Controller VM
  • On AHV, ESXi and Hyper-V, ensures the CVMs can communicate via eth0 with their configured MTU without upstream network fragmentation.

For more information about this check, take a look at this article.

How to Change AHV Host MTU for Jumbo Frames? 

Check out this KB that explains the preparation and the steps to change the host MTU with or without LACP in you switches. 


If you have any questions, let me know in the comments! 

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