ASU, or Accelerated Software Upgrade, is a feature to minimize traffic loss when upgrading from one ASU supported EOS

SSU ASU 4.22.0F

ASU (or Accelerated Software Upgrade) is a feature that will minimize traffic loss when upgrading from one ASU

ASU allows a user to upgrade the switch to a newer software release with minimal downtime (no traffic loss). In some

4.21.0F ASU

The EOS-4.35.1F release introduces IGMP Snooping Accelerated Software Upgrade (ASU) support. This enhancement guarantees sub second disruption to multicast forwarding services during software upgrades by ensuring IGMP Snooping remains fully operational and preserving its learned state without interruption. This is essential for highly sensitive environments like IPTV and financial institutions. ​​

4.24.0F adds Accelerated Software Upgrade (ASU) support to the 7170 series.  Accelerated Software Upgrade

Leaf Smart System Upgrade (SSU) provides the ability to upgrade the EOS image with minimal traffic disruption.