Stack Speed

[roy]

When do you need to take Stacking Speed into consideration?  Like is there a situation where it's better to have 40G over 20G?  In what situation would you want the SummitStack-V400 speed?

[Gabriel_G · Accepted solution]

Traffic that comes in on one slot but leaves another will cross the stacking backplane and will consume stacking bandwidth. If you have many devices on one slot that must communicate with devices on another, you should consider that bandwidth and choose a stacking solution accordingly. 

The V### Notation indicates the total stacking bandwidth and is effectively the Stack Port Speed x 2 (Full Duplex) x 2 (2 Stacking Cables), IE V400 stacking uses 100G Links.

The HW Install Guides have a lot of good info on stacking:

ExtremeSwitching Hardware Installation Guide - for Switches Using ExtremeXOS Version 30 (extremenetw...