NebulaFlex Switch GS2220 Series - V5.00 Patch 2 Firmware Release

Zyxel_Melen

Zyxel Switch GS2220 Series Release Note 

September 2025

Firmware Version on all models

(Click Hyperlink to download the firmware directly)

Zyxel GS2220-10 - V5.00(ABRO.2)C0

Zyxel GS2220-10HP - V5.00(ABRP.2)C0

Zyxel GS2220-24 - V5.00(ABRQ.2)C0

Zyxel GS2220-28HP - V5.00(ABRR.2)C0

Zyxel GS2220-50 - V5.00(ABRS.2)C0

Zyxel GS2220-50HP - V5.00(ABRT.2)C0

New Feature and Enhancements

1. [Nebula 19.10] Support Port advisor. 

2. [Nebula 19.20] VLAN ingress check enabled by default. 

3. [Standalone, Nebula] MAC-auth support attribute: NAS-Port, NAS-Port-Type, Framed-MTU, state, calling-station-id, message-authenticator.

Bug Fix

C=Cloud mode, S=Standalone mode

Bug fix	C	S
1. [eITS #241100538] Fixed special characters (space, ' ," ) can be allowed in username to cause configuration error.	-	V
2. [eITS #241200595] Fixed high CPU usage triggered by client switching between trunk interfaces.	V	V
3. [eITS #250100026] Fixed abnormal crash issue when continuous queries OID 1.0.8802.1.1.2.1.5.4795.1.2.1.1 and its sub-OIDs.	V	V
4. [eITS #250200357] Switch has dropped the EAPoL unicast packet.	V	V
5. [eITS #250200815, 250400367] After deleting original and creating another mgmt VLAN and IP, pinging the new mgmt IP over LACP links will fail if one of the LACP member ports is inactive.	V	V
6. [eITS #250201088] When the RADIUS server does not provide a session- timeout attribute, the switch will re- authenticate successfully connected devices every hour by default.	V	V
7. [eITS #250301742, 250600412] Supplicants that have successfully passed 802.1X authentication may still be incorrectly assigned to guest VLAN if the reachability of RADIUS server is unstable.	-	V
8. [eITS #250302188] MAC-auth via Nebula cloud authentication becomes significantly slower in Bug fix Nebula Standalone authenticating supplicants after a reboot.	V	-
9. [eITS #250302409] Fixed the device sometimes fail to connect with Nebula server.	V	-
10. [eITS #250500332] Fixed that truncated DNS packets cannot be processed causing DNS parsing failed.	V	V
11. [eITS #250500429] Fixed crash when receiving IPv6 tunnel packet.	-	V
12. [eITS #250500683] Voice VLAN (via LLDP MED) does not work properly when enabling MAC-auth under Nebula cloud authentication.	V	-
13. [eITS #250800443] Special characters in the port name cause the port information to appear blank on the Dashboard.	V	V

Please refer to the Download Link for more details.