Date: February 11, 2021

Last Updated: February 10, 2021

Software Version: EOS 4.21


The Arista EOS Life Cycle policy defines a 36 month lifecycle for each major release train. The EOS 4.21 software train will reach the 36 month timeline on August 9th 2021. At that time, EOS 4.21 will be considered End of Support with no further official software support on this version from Arista. This notice is intended to serve as a reminder of this upcoming event. Customers running EOS 4.21 should work with their Arista sales team to discuss possible upgrade options. In addition, a general EOS upgrade recommendation can be found at: Software Downloads page. 

For more information about Arista’s EOS/EOL policies and/or to obtain an explanation of terms used in this announcement, please refer to the Arista Product Life Cycle Policy. If you require further assistance, or if you have any further questions regarding this notice, please contact the Arista Networks Technical Assistance Center (TAC) by one of the following methods:

Open a Service Request

By email: This email address is being protected from spambots. You need JavaScript enabled to view it.

A complete list of contact information for TAC assistance is available here.