A new stable switchCatalyst firmware version is available. Firmware CS 17.2.1.1 was just released on 2025-04-24 and has been in this firmware category since 2025-04-24.
This version's IOS image is based on 17.12.4 CCO. Upgrades to this version will result in a full system reload.
New feature highlights
Client Analytics
Device Uptime for MS390s
EEE (Energy Efficient Ethernet) Support
Multi-auth with support for guest/failed/critical
RADIUS Caching
Support for Multicast in Live Tool
VLAN to SGT mapping
General fixed issues
The local status page has been enhanced to enable managing the allowed VLANs range using a single configuration option
Fixed a bug with client analytics on Access switch ports that prevented clients from being correctly listed in Switch Summary, Switch Ports, and Client pages
Resolved an issue that caused MAC flapping and packet loss on downstream switches
Introduced measures to significantly decrease occurrences of the Meraki container becoming trapped in a reboot loop while switches maintain data traffic flow. This scenario may still occur in rare cases.
Corrected an issue that caused stack ports to be incorrectly displayed as "Disconnected" after a stack member was rebooted
Fixed a bug that caused the Static Gateway IP to display as '0.0.0.0' in the L3 Routing Switch tab
Resolved an issue that occasionally prevented the uplink port from being identified correctly on the Dashboard. This issue did not affect device connectivity.
Fixed a bug that caused a brief period of L3 traffic loss after the active member of a stack failed over
All new LAG configurations will block redundant links if the connected device is not configured for LACP. This change fixes an issue where switches would sometimes move LAG ports to an active forwarding state prior to LACP convergence, creating the potential for loops. The change does not apply to existing LAG configurations.
Ms390 fixed issues
Resolved an issue that prevented the application of fixed IP assignments if the IP being assigned had an active DHCP lease
Fixed a bug that would infrequently prevent MS390 stacks from converging after a failover
C9300 known issues
Some C9300X stacks have been reported to fail due to memory exhaustion, requiring an ios restart to restore service
Ms390 known issues
In rare circumstances, MS390 stacks may display UDLD loop detection alerts that cannot be cleared by cycling the looping port
MS390s may display an alert, "A power supply is offline" when a PSU isn't installed in the second slot
Items in italics were already fixed in the previous release, but are still listed in the notes for this release.
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