NebulaFlex Switch CX4800 Series - V2.00 Patch 0 Firmware Release

Zyxel_Melen · January 5

Zyxel Switch CX4800 Series Release Note

January 2026

FA-OS Firmware Version on all models

(Click Hyperlink to download the firmware directly)

New Feature and Enhancements

1 [Standalone, Nebula] Support stacking capability for network resiliency up to 2 units.
2 [Standalone, Nebula] Support 2 ports/4 ports stacking option.
3 [Standalone] Support VRRP.
4 [Standalone] Support L3 IPv4 Routing
4.1.1 Policy route
4.1.2 OSPF
4.1.3 RIP
4.1.4 ECMP
4.1.5 IGMP Route
4.1.6 DVMRP
5 [Standalone] Support Loopback Interface.
6 [Standalone] Support L2PT.
7 [Standalone] Support ZULD.
8 [Standalone] Support PPPoE Intermediate Agent.
9 [Standalone] Support MAC Pinning.
10 [Nebula] Support Port advisor.
11 [Standalone] Support password complexity for user/SNMP account and enable mode, with default setting disabled.
12 [Standalone] Enable password encryption by default to enhance security.
13 [Standalone] Support user IP lockout functionality after a certain number of failed login attempts.
14 [Standalone] Add new system log for changes in service access control configuration.
15 [Standalone] Support event log and SNMP trap functionality to generate alerts when system logs reached 90% of thresholds.
16 [Standalone] Limit login accounts with privileges 0 to 2 only to display basic system information on web GUI.
17 [Standalone] Device firmware upgrade will check file checksum.
18 [Standalone] Support interactive password command for masking password in CLI when you creating account.
19 [Standalone] Web Support Re-Generate SSH Public Key 2048-bit for RSA.
20 [Standalone] Support Rmirror.
21 [Standalone] Improve 802.1X and MAC authentication support to identify the NAS-Port, Framed-MTU, State, Session-Timeout, Terminate-Action, Calling-Station-Id, and Message- Authenticator attributes.
22 [Nebula] VLAN ingress check enabled by default.
23 [Nebula] Support SNMPv3.

Bug Fix

C=Cloud mode, S=Standalone mode

Bug fix	C	S
1. [eITS#250100440] Fixed that truncated DNS packets cannot be processed causing DNS parsing failed.	V	V
2. [eITS#250201088] When the RADIUS server does not provide a session-timeout attribute, the switch will reauthenticate successfully connected devices every hour by default.	V	V
3. [eITS#250302215] Fixed high CPU usage triggered by client switching between trunk interfaces.	V	V
4. [eITS#250300923] Fixed an issue where RADIUS authentication could fail after stack takeover.	V	V
5. [eITS#250302409] Fixed the device sometimes fail to connect with Nebula server.	V	-
6. [eITS#250400528] Fixed an issue where SNMP queries to OIDs 1.3.6.1.2.1.4.22 or 1.3.6.1.2.1.4.35 could cause high CPU utilization.	V	V
7. [eITS#250302188] MAC-auth via Nebula cloud authentication becomes significantly slower in authenticating supplicants after a reboot.	V	-
8. [eITS#250301742, 250600412, 251000993] 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
9. [eITS#250800443] Special characters in the port name cause the port information to appear blank on the Dashboard.	V	V
10. [eITS#250900392] Restoring or reloading the configuration results in an error if the time range profile name contains spaces	-	V
11. [eITS#250900428] The date format in the backup configuration file name becomes incorrect when Daylight Saving Time is enabled.	V	V
12. [eITS#250601084] Fixed hang when using CLI to 4/9Bug fix Nebula Standalone show tech-support.	V	V
13. [eITS#251100917] Fixed a timer-related issue that could trigger an unexpected reboot	V	V
14. When configuring 802.1x in NCC, the feature will not work well due to configuration may missing.	V	-

Please refer to the Download Link for more details.