Zyxel NebulaFlex Switch XGS1935 Series

Software Release Note V4.90(ACJ_.2)C0

Date: September 5, 2025

Overview

This document describes the features in the XGS1935 series for its 4.90(ACJ_.2)C0 release. The XGS1935 series is a hybrid switch with NebulaFlex technology, supporting operation in either Standalone mode or Nebula cloud management mode.

Supported Platforms

Support Platform	ZyNOS Firmware version	Boot Version
Zyxel XGS1935-28	V4.90(ACJW.2)C0	V1.00 \| 05/30/2024
Zyxel XGS1935-28HP	V4.90(ACJX.2)C0	V1.00 \| 05/30/2024
Zyxel XGS1935-52	V4.90(ACJY.2)C0	V1.00 \| 05/30/2024
Zyxel XGS1935-52HP	V4.90(ACJZ.2)C0	V1.00 \| 05/30/2024

New Feature and Enhancements

[Nebula 19.10] Support Port advisor.
[Nebula 19.20] VLAN ingress check enabled by default.

Bug Fix

Bug Fix	Nebula	Standalone
[eITS #250800443] Special characters in the port name cause the port information to appear blank on the Dashboard.	V	V
[eITS #250200357] The switch has drop the EAPOL unicast packet.	V	V

Known Issue

Known Issue	Nebula	Standalone
The switch cannot access cluster member when cluster member's password been encrypted.	V	V
The accuracy of cable diagnostic is +- 20m. When without cables, the value of distance to fault would not be 0.	V	V
Only 2 criteria of link aggregation can be used at the same time. The third criteria set on trunks will not be implemented, but follow the first criteria.	-	V
ZON utility show the wrong message when it reset the switch to the default setting.	V	V

Limitation of Settings

Limitation of Setting	Nebula	Standalone
802.1Q Static VLANs	1K	1K
Static MAC forwarding entry	256	256
MAC filtering entry	256	256
Cluster member	-	24
Port-security max address-limit number	16K	16K
Syslog server entry	2	4
MAC table	16K	16K
Multicast group	1K	1K
ACL	128	256
DHCP Relay Entry	16	16
Static ARP entry	-	256
Static route max entry	32	32
Trunk groups	28(HP):12	28(HP):12
Per trunk group port number	52(HP):24	52(HP):24
MSTP instance	8	8
Voice VLAN OUI entry	-	0-16
ZON neighbor per-port maximum clients	6	10

Change History

V4.90(ACJ_.2) | 09/05/2025
V4.90(ACJ_.1) | 08/08/2025
V4.90(ACJ_.0) | 07/10/2024

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