INTRODUCTION

The GWN7721 Series consists of the GWN7721, GWN7721P, and GWN7721PE Layer 2 Lite managed multi-gigabit switches for scalable, secure, and intelligent small-to-medium business networks. The GWN7721 and GWN7721P provide eight 2.5 Gigabit Ethernet ports and two 10 Gigabit SFP+ ports. The GWN7721PE provides eight 2.5 Gigabit PoE/PoE+ Ethernet ports, one 10 Gigabit PoE/PoE+/PoE++ Ethernet port, and one 10 Gigabit SFP+ port. The series supports VLAN traffic segmentation, DSCP/802.1p QoS, bandwidth control, IGMP Snooping, and comprehensive security protection.

The GWN7721 Series is managed through the same local web user interface, GWN Manager, and Grandstream Device Management System (GDMS). Installation options depend on the model: the GWN7721 supports desktop or wall mounting, the GWN7721P supports desktop, wall, or rack mounting, and the GWN7721PE supports desktop or rack mounting.

PRODUCT OVERVIEW

Feature Highlights

• GWN7721

GWN7721

8 × 2.5G Ethernet ports (non-PoE) 2 × 10G SFP+ uplink ports Fanless design for quiet operation LED indicators for link, activity, and device status IGMP Snooping to optimize multicast traffic Comprehensive protection features, including port security and MAC filtering

GWN7721 Features at a glance

• GWN7721P

GWN7721P

8 × 2.5G Ethernet ports with PoE/PoE+ 2 × 10G SFP+ uplink ports Up to 30 W per PoE port with a 130 W total PoE budget LED indicators for link, activity, power, and PoE status IGMP Snooping to optimize multicast traffic Comprehensive protection features, including port security and MAC filtering

GWN7721P Features at a glance

• GWN7721PE

GWN7721PE

8 × 2.5G Ethernet ports with PoE/PoE+ 1 × 10G Ethernet port with PoE/PoE+/PoE++ up to 90 W 1 × 10G SFP+ uplink port 130 W total PoE budget and fanless design LED indicators for link, activity, power, and PoE status Comprehensive protection features, including port security and MAC filtering

GWN7721PE Features at a glance

GWN7721 Series Technical Specifications

	GWN7721	GWN7721P	GWN7721PE
2.5 Gigabit Ethernet ports	8	8	8
10 Gigabit Ethernet ports	—	—	1
10 Gigabit SFP+ ports	2	2	1
Maximum supported 10G modules	SM-10G: 2; MM-10G: 2; RJ45-10G: 1	SM-10G: 2; MM-10G: 2; RJ45-10G: 1	SM-10G: 1; MM-10G: 1; RJ45-10G: 1
PoE standards	—	IEEE 802.3af/at	IEEE 802.3af/at/bt
PoE ports	—	8	9
Maximum output per PoE port	—	30 W	30 W (ports 1–8); 90 W (port 9)
Maximum total PoE output	—	130 W	130 W
Power supply	12 V DC / 1 A	100–240 V AC, 50/60 Hz	100–240 V AC, 50/60 Hz
Total non-blocking throughput	40 Gbps	40 Gbps	40 Gbps
Switching capability	80 Gbps	80 Gbps	80 Gbps
Packet buffer	8 Mb	8 Mb	8 Mb
MAC address capacity	16K	16K	16K
Installation	Desktop or wall mount	Desktop, wall mount, or rack mount	Desktop or rack mount
Unit dimensions (L × W × H)	190 × 100 × 28 mm	280 × 180 × 44 mm	280 × 180 × 44 mm
Package dimensions	300 × 129.5 × 53 mm	361 × 195.5 × 52 mm	361 × 195.5 × 52 mm
Unit weight	0.6 kg	1.58 kg	1.848 kg
Package weight	0.767 kg	2.036 kg	2.088 kg
Data-transfer LEDs	10 green LEDs	10 green LEDs	10 green LEDs
PoE supply LEDs	—	8 yellow LEDs	9 yellow LEDs
Operating temperature	0 °C to 45 °C	0 °C to 45 °C	0 °C to 45 °C
Storage temperature	−20 °C to 60 °C	−20 °C to 60 °C	−20 °C to 60 °C
Humidity	10%–90% RH, non-condensing	10%–90% RH, non-condensing	10%–90% RH, non-condensing
Surge protection	±1 kV CM/DM (power); 1 kV (network ports)	±6 kV CM/DM (power); ±2 kV (network ports)	±6 kV CM/DM (power); ±2 kV (network ports)
ESD	±12 kV contact discharge	±12 kV contact discharge	±12 kV contact discharge
Compliance	FCC, CE, RCM, IC	FCC, CE, RCM, IC	FCC, CE, RCM, IC

INSTALLATION

Before deploying and configuring the GWN772x switch, the device needs to be properly powered up and connected to the network. This section describes detailed information on the installation, connection, and warranty policy of the GWN772x switch.

Package Contents

• GWN7721 Series

Port Description

• GWN7721 Series

Grounding and Accessing GWN772x

Grounding the GWN7721 Series Switches

1. Remove the ground screw from the back of the switch, and connect one end of the ground cable to the wiring terminal of the switch.
2. Put the ground screw back into the screw hole, and tighten it with a screwdriver.
3. Connect the other end of the ground cable to the other device that has been grounded or directly to the terminal of the ground bar in the equipment room.

GWN7721P/PE Deployment Cases

802.3af/at PoE+ Power and Data Transmission

On the GWN7721P, ports 1–8 support IEEE 802.3af/at PoE/PoE+ with up to 30 W per port. On the GWN7721PE, ports 1–8 support up to 30 W per port and port 9 is a 10 Gigabit Ethernet port supporting IEEE 802.3af/at/bt PoE/PoE+/PoE++ with up to 90 W. The GWN7721P provides two 10 Gigabit SFP+ ports, while the GWN7721PE provides one 10 Gigabit SFP+ port.

• Port 1: 2.5G Gaming PC
• Port 3: 802.3af/at PoE+ GRP VoIP Phone
• Port 5: 802.3af/at PoE Camera
• Port 6: 802.3af PoE IP Video Intercom System
• Port 8: Wireless 802.3af PoE WiFi 6/6E AP
• GWN7721P ports 9–10: 10 Gigabit SFP+ uplinks.
• GWN7721PE port 9: 10 Gigabit RJ45 PoE++ port (up to 90 W); port 10: 10 Gigabit SFP+ uplink.

PoE Watchdog

Use VLAN to isolate the IP Camera/Internet/IPTV traffic. Use link aggregation to increase upstream bandwidth.

Anomaly Detection: The PoE switch continuously monitors the network operation status of connected powered devices (such as cameras, APs, IP phones, etc.).

Automatic Restart: If a device fails to respond within the set time, PoE Watchdog will proactively cut off its power supply and reboot it to restore functionality.

Reduced Manual Intervention: Eliminates the need for manual power plugging/unplugging or on-site maintenance, enhancing network reliability

GETTING STARTED

Device LED Indicators

The front panel of the GWN772x has LED indicators for power and interface activities. The table below describes the LED indicators’ status.

LED indicator	Status	Description
System indicator	Off / green / blue / red	Power, upgrade, normal use, provisioning, failure, and factory-reset status
Port indicator	Off / green on / green flashing	No link, active link, or data transfer
PoE supply LED (GWN7721P)	8 yellow LEDs	PoE status for ports 1–8
PoE supply LED (GWN7721PE)	9 yellow LEDs	PoE status for ports 1–9

Access and configure

Log in using the Web UI

1. A PC uses a network cable to correctly connect any RJ45 port of the switch.
2. Set the Ethernet (or local connection) IP address of the PC to 192.168.0.x (“x” is any value between 1-253), and the subnet mask to 255.255.255.0, so that it is in the same network segment as the switch IP address. If DHCP is used, this step could be skipped.
3. Type the switch’s management IP address http:// in the browser, and enter the username and password to log in. (The default administrator username is “admin” and the default random password can be found on the sticker on the GWN772x switch.)

Configure using GDMS Networking/GWN Manager

Type https://www.gdms.cloud (https://<gwn_manager_IP> for GWN Manager) in the browser, and enter the account and password to log in to the cloud platform. If you don’t have an account, please register first or ask the administrator to assign one for you. To add a GWN switch to the GDMS Networking/GWN manager, refer to the online documentation: https://documentation.grandstream.com.

WebUI Configuration

GWN772x WebUI includes 10 main sections to configure and manage the switch and check the connection status.

Search

GWN772x Switches have search functionality to help the user find the right configuration, settings, parameters, etc.

On the top of the page, there is a search icon; the user can click on it and then enter the keyword relevant to their search, and then they will get all the possible locations of that keyword.

Language

To change the language on the GWN772x switch interface:

• Navigate to the top right corner of the interface where the username is displayed.
• Click on the drop-down menu next to the username.
• Select “Language” from the drop-down options.
• After selecting the language, the interface will switch to the chosen language.

Reboot

To reboot the GWN772x switch:

• Navigate to the top right corner of the interface where the username is displayed.
• Click on the drop-down menu next to the username.
• Select “Reboot” from the drop-down options.
• Confirm the action to reboot the device.
• The device will automatically restart after a brief delay.

Change Password

To change the password on your GWN772x switch:

• Navigate to the top right corner of the interface where the username is displayed.
• Click on the drop-down menu next to the username.
• Select “Change Password” from the drop-down options.
• A “Change Password” dialog box will appear.
• Enter the current password in the Current Password field.
• In the New Password field, input a new password that meets the criteria: it must contain 8-32 characters and include at least two of the following: digits, letters, and special characters (e.g., admin,123).
• Enter the same password in the Confirm New Password field.
• Click “Complete” to apply the changes.

Logout

To log out of the GWN772x switch:

• Navigate to the top right corner of the interface where the username is displayed.
• Click on the drop-down menu next to the username.
• Select “Logout” to safely log out of the current session.

OVERVIEW

The overview is the first section that displays System information on the first page, “System Info”, and Port status on the second page, “Port Info”. This section provides the user with a general and global view of the GWN772x system and port status for easy monitoring.

System Info

System Info is the first page after successfully logging into the GWN772x Web Interface. It provides an overall view of the GWN772x Switch information, like Device name, MAC Address, System Version, etc.

To name the device, please click on , then enter the desired name.

Port Info

This page displays the status for each port on the GWN772x switches indicated by color code (green, red, grey, white, etc) and PoE symbol. Please refer to the figure below:

The following table explains the color code and the symbols used:

Ports Labels and Color Code

Note: A PoE symbol and color code combination is also possible. Ex: in this case, the port is using 1000 Mbps speed and also using PoE at the same time.

There are 3 main sections for each port:

• Basic Info: displays info about the port name, speed, status, etc.

Note: Click onto modify the port settings like Description, Speed, Duplex Mode, and Flow Control, or to enable or disable the port.

• PoE Power Supply: displays PoE Current Power and priority, Status, etc.

Note: Click on to change PoE settings.

SYSTEM

IP Settings

The IP Settings page controls the switch management interface. From this page, administrators can select the Management VLAN, obtain an address through DHCP or configure a Static IPv4 address, specify DNS servers, and set the Maximum Transmission Unit (MTU).

Management VLAN

The Management VLAN identifies the VLAN used to reach the switch’s management interface. Ensure the administrator’s device and the required switch ports can reach this VLAN before applying the change.

IPv4 Address Settings

Select DHCP to obtain the IPv4 address and DNS information automatically, or select Static to enter the IPv4 address, subnet mask, gateway, and DNS servers manually.

Maximum Transmission Unit (MTU)

The MTU specifies the maximum IP packet size, in bytes, used by the switch management interface. The supported range is 576–1500 bytes, and the default value is 1500 bytes. Use a smaller value only when required by the network path.

IP Settings

Management Platform

The Management Platform allows users to configure how the GWN772x switch connects to a management platform. The switch supports multiple management platforms, including GDMS Networking and GWN Manager. The management platform selection can either be automatic or manually specified by the user.

Steps to Configure the Management Platform

1. Navigate to: System ➝ Management Platform.
2. Enable DHCP Option 43: If needed, toggle on “Allow DHCP Option 43 to Override.”
3. Select Connection Management Platform:
   • Choose Auto for automatic platform selection.
   • Select GDMS Networking or L2/L3 Manager, based on your setup.
4. Specify Server Address and Port (if applicable):
   • If a specific platform is selected (e.g., L3 Manager), input the server address and port number.
5. Save your configuration.

For more details, refer to this table:

Management platform

When the switch is successfully connected to a platform (either GDMS Networking or GWN Manager), a corresponding Cloud Icon with a green check mark will appear at the top of the Web UI. This icon signifies that the switch is now integrated with the management platform, and some configurations from the platform may now be applied to the switch, as shown below:

SWITCHING

The switching section covers Ports and LAG (Link Aggregation Group) configurations.

Port Settings

On this page, you can configure the basic parameters for GWN772x Switch ports, like disabling or enabling the port, adding a Description, specifying the speed, Duplex mode, and Flow Control.

To configure a port, please navigate to Switching → Port Settings.

To configure a port, click on the “Edit” icon under the operation column.

Port Settings – Edit port

Jumbo Frame

The maximum Transmission Payload or MTU is typically 1500 bytes. In case the user requires even a bigger MTU length for a specific scenario, there is an option on the GWN772x Switch to enable Jumbo Frame; the maximum Ethernet frame size ranges from 1518 to 9216 bytes. The default value is 9216 bytes.

LAG

LAG means Link Aggregation Group, which groups some physical ports to make a single high-bandwidth data path. Thus, it can implement traffic load sharing among the member ports in a group to enhance the connection reliability.

To configure LAG, please navigate to Switching → LAG.

GWN772x switches support up to 5 link aggregation groups, as shown in the figure below:

To edit/configure a LAG, click on the “Edit” icon under the operation column.

Edit LAG

MAC Address Search

The MAC address table records the correspondence between the MAC addresses of other devices learned by the switch and the interfaces, as well as information such as the VLANs to which the interfaces belong. When forwarding a packet, the device queries the MAC address table according to the destination MAC address of the packet. If the MAC address table contains an entry corresponding to the destination MAC address of the packet, it directly forwards the packet through the outbound interface in the entry. If the MAC address table does not contain an entry corresponding to the destination MAC address of the packet, the device will use broadcast mode to forward the packet on all interfaces in the VLAN to which it belongs, except the receiving interface.

On this page, the user can search using the MAC address and the VLAN. If the device’s MAC address is found, it will be displayed on the Search Result section.

Spanning Tree

The Spanning Tree Protocol (STP) prevents network loops by creating a loop-free topology in Ethernet networks. It allows redundant paths without causing broadcast storms or multiple frame copies.

Global Settings – Spanning Tree

The Global Settings tab in the Spanning Tree section lets administrators configure general Spanning Tree settings and view real-time status.

To access Spanning Tree Global Settings:

1. Navigate to Switching → Spanning Tree → Global Settings.
2. Enable Spanning Tree by toggling the switch to ON.
3. Configure the following fields:

Spanning Tree – Global Settings

This section displays the current status of the spanning tree topology. You can refresh the information by clicking the Refresh icon.

Spanning Tree – Real-Time Status Information

Port Settings – Spanning Tree

The Port Settings tab allows configuration of Spanning Tree on a per-port basis, enabling administrators to control port behavior, priority, path cost, and monitor port status.

To configure Spanning Tree on specific ports:

1. Navigate to Switching → Spanning Tree → Port Settings.
2. Select the port you wish to configure and click Edit.
3. Configure the following fields:

Spanning Tree – Port Settings

Port Status

This section provides real-time information about the selected port’s spanning tree status.

Spanning Tree – Port Status

VLAN

A virtual local area network, virtual LAN or VLAN, is a group of hosts with a common set of requirements that communicate as if they were attached to the same broadcast domain, regardless of their physical location. A VLAN has the same attributes as a physical local area network (LAN), but it allows for end stations to be grouped even if they are not located on the same network switch. VLAN membership can be configured through software instead of physically relocating devices or connections.

Port VLAN

On this page, the user can select which VLANs (a preset from 1 to 8) can be allowed on GWN772x ports. This is a simplified way to manage VLANs from 1 to 8. To have more flexibility and control, please enable 802.1Q VLAN, and the Port VLAN will be disabled automatically.

First, enable Port VLAN as shown below:

Click the “Edit” icon under the Operation column to edit a VLAN, then select which ports this VLAN will be allowed on.

802.1Q VLAN

For more flexibility and control over VLAN configuration, the user can enable 802.1Q VLAN, and in this case, the user is not only restricted to VLANs from 1 to 8.

Click on the “Add” button to add a VLAN, as shown below:

On this screen, the user can configure the VLAN:

• VLAN: specify the VLAN ID (Range 2-4094).
• Description: Enter a description for the VLAN.
• Member Type: a shortcut to untag/tag or remove all members.
• Physical port: select the tagged/untagged ports accordingly.

802.1Q PVID Settings

If the 802.1Q VLAN is enabled, the user can select the PVID (Port VLAN ID) or native VLAN when there is more than one VLAN on a port. Click on the “Edit” icon under operation to modify the PVID on a specific port.

When editing a port, the following options are available:

• PVID (Port VLAN ID): Assigns the default VLAN ID for untagged traffic entering the port. All untagged packets received on this port will be associated with the configured PVID.
• VLAN Transparent: When enabled, the port bypasses the local 802.1Q VLAN table and directly forwards all VLAN-tagged packets without modification. This allows the port to act as a VLAN-agnostic pass-through, useful when the switch should not enforce VLAN isolation (e.g., when passing VLANs between two VLAN-aware devices).

IGMP SNOOPING

The GWN772x switches support IGMP snooping, which is an IPv4 Layer 2 multicast protocol that optimizes the handling of multicast traffic in a network by intelligently forwarding traffic only to the ports where interested hosts are located, based on the monitoring of IGMP messages.

On the Global Settings tab, the users can enable the IGMP Snooping feature by toggling ON the feature, and for an Unknown Multicast Packet will be either dropped or flooded as shown below:

IGMP snooping dynamically identifies router ports by monitoring IGMP General Query messages and optimizes the forwarding of multicast traffic to those ports for efficient use of network bandwidth.

The Dynamic Router Port tab displays all the discovered dynamic router ports. The users can click on the “Refresh” button to refresh the list.

QOS

The popularity of the network and the diversification of services have led to a surge in Internet traffic, resulting in network congestion, increased forwarding delay, and even packet loss in severe cases, resulting in reduced service quality or even unavailability. Therefore, to carry out these real-time services on the network, it is necessary to solve the problem of network congestion. The best way is to increase the bandwidth of the network, but considering the cost of operation and maintenance, this is not realistic. The most effective solution is to apply” Guaranteed ” policies to govern network traffic. QoS technology is developed under this background. QoS is quality of service, and its purpose is to provide end-to-end service quality assurance for various business needs. QoS is a tool for effectively utilizing network resources. It allows different traffic flows to compete for network resources unequally. Voice, video, and important data applications can be prioritized in network equipment.

QoS Basic Settings

On this page, the user can edit the port priority for each port. The supported modes are:

• Port-Based
• 802.1P-Based
• DSCP-Based

Please navigate to QoS → QoS Basic Settings page:

Select one or multiple ports, then click on the “Edit” button to modify the ports’ priority. The priority range is from 0 to 7; a larger value indicates a higher priority, and value 0 is the default value.

Priority Mapping

Priority mapping is used to realize the conversion between the QoS priority carried in the packet and the internal priority of the device ( also known as the local priority, which is the priority used by the device to differentiate the service level of the packet ) so that the device provides the Differentiated QoS service quality. Users can use different QoS priority fields in different networks according to network planning.

• 802.1p Mapping

On this tab, the user can map between 802.1p and CoS (Class of Service) where 0 is the lowest priority and 7 is the highest priority for 802.1p, and by default, CoS is set to be the same (it’s recommended to keep it by default only if necessary or a specific network requires it).

• DSCP Mapping

On this tab, the user can map between CoS and DSCP (Differentiated Services Code Point); in this case, 802.1p and CoS mapping must be configured first. (It’s recommended to keep the default settings to keep the consistency between all switches, only if it’s necessary or the network requires it.)

Queue Scheduling

When congestion occurs in the network, the device will determine the processing order of forwarding packets according to the specified scheduling policy, so that high-priority packets are preferentially scheduled.

Queue scheduling algorithm: queue scheduling according to the switch interface.

• Strict priority (SP) scheduling: The flow with the highest priority is served first, and the flow with the second highest priority is served until there is no flow at that priority. Each interface of the switch supports 8 queues ( queues 0-7 ), queue 7 is the highest priority queue, and queue 0 is the lowest priority queue. Disadvantage: When congestion occurs, if there are packets in the high-priority queue for a long time, the packets in the low-priority queue cannot be scheduled, and data cannot be transmitted.
• Weighted Fair Queuing (WFQ) scheduling: Based on ensuring fairness (bandwidth, delay) as much as possible, priority considerations are added, so that high-priority packets have more opportunities for priority scheduling than low-priority packets. WFQ can automatically classify flows by their “session” information (protocol type, source and destination IP addresses, source and destination TCP or UDP ports, priority bits in the ToS field, etc.) Place each flow evenly into different queues, thus balancing the latency of the individual flows as a whole. When dequeuing, WFQ allocates the bandwidth that each flow should occupy at the egress according to the flow priority (Precedence). The smaller the priority value is, the less bandwidth is obtained; otherwise, the more bandwidth is obtained.

Select one or multiple ports, then click on the “Edit” button to modify the ports’ Queuing Algorithm. The default algorithm is set to Strict Priority (SP).

If Weighted Fair Queuing (WFQ) is selected, the Weight option can be configured accordingly; the higher the Weight, the higher the traffic priority.

Rate Limit

The interface rate limit can limit the total rate of all packets sent or received on an interface. The interface rate limit also uses the token bucket to control the flow. If an interface rate limit is configured on an interface of the device, all packets sent through this interface must first be processed through the token bucket of the interface rate limiter. If there are enough tokens in the token bucket, the packet can be sent; otherwise, the packet will be discarded or cached.

To configure Rate Limit, please navigate to QoS → Rate Limit, then select one or multiple ports, click on the “Edit” button to edit the port(s).

Enable the Ingress (incoming traffic to the switch) and then set the rate limit (in Kbps), and then enable Egress (outgoing traffic) and set the rate limit (in Kbps).

Security

DHCP Snooping

DHCP Snooping is a security feature that protects against rogue DHCP servers. It allows network administrators to specify trusted and untrusted ports, ensuring that only legitimate DHCP servers can provide IP addresses. Untrusted ports will drop DHCP server responses from unauthorized servers, while trusted ports will allow traffic from legitimate DHCP servers.

To enable DHCP Snooping:

1. Log in to the Web UI of your GWN772x switch.
2. Navigate to:
   • Security → DHCP Snooping
3. Enable DHCP Snooping globally by toggling the switch at the top of the page.

Once enabled, DHCP Snooping will monitor and filter DHCP traffic on all interfaces.

DHCP Snooping Port Settings

Configure the trusted/untrusted status of each port and whether DHCP Option 82 is enabled, to help with tracking and security.

Port-Specific Settings: You can configure DHCP Snooping on individual ports.

• Click Edit next to the port you want to configure.
• The following fields can be adjusted:

DHCP Snooping Edit port

POE

Power Over Ethernet (PoE) refers to supplying power over an Ethernet network, also known as a local area network-based power supply system, PoL, or Active Ethernet.

Usually, the terminal devices of the access point need to use a DC power supply, but due to insufficient wiring, these devices need unified power management. At this time, the switch interface provides the power supply function, which can solve the above problems and realize the precise control of the port PoE power supply.

Power Supply Info

This page displays the Power Supply Info like the number of PoE, Total, Remaining PoE Power, etc, and even the Supply Voltage.

Power Supply Setting

On this page, the user can configure on each port that supports PoE: The max power supply, the power supply priority, and the power supply mode. For example, GWN7721P ports 1–8 support PoE/PoE+. On the GWN7721PE, ports 1–8 support PoE/PoE+, while port 9 additionally supports PoE++ with up to 90 W output.

To reset the PSE, click on the “PSE Reset” button as shown below:

When resetting the Power Sourcing Equipment (PSE) on the GWN7721P or GWN7721PE switch, a confirmation dialog appears, warning that this action will power off and restart all connected Powered Devices (PDs). The user must acknowledge the risk by selecting the checkbox and clicking “Ok” to proceed.

To edit the PoE parameters on the supported port, click on the “Edit icon” under the operation column, then select from the drop-down lists the power supply standard, power supply mode, and power supply priority.

When multiple Powered Devices (PDs) are connected and the PoE power budget is limited, the GWN772X prioritizes power supply based on the power-on time of the connected devices.

If multiple ports have the same configured PoE priority, the device that was powered on earlier will have higher priority to retain power.

Example: If two PDs are connected to Port 3 and Port 7 with equal priority settings, and the available PoE budget becomes insufficient to power both, the device that was connected or powered on first will continue receiving power, while the latter one may be disconnected.

PoE Watchdog

The PoE Watchdog feature is designed to monitor the connectivity of Powered Devices (PD) on PoE-enabled ports. The switch periodically sends packets to a configured IP address to check the PD’s availability. If the PD does not respond, the switch will disable and re-enable the PoE on that port, effectively rebooting the device. This feature is useful for ensuring the continuous operation of critical devices like IP cameras, access points, or VoIP phones.

Steps to Configure PoE Watchdog

1. Navigate to PoE → PoE Watchdog from the web interface.
2. Click on the edit icon next to the port you want to configure.
3. In the edit page, configure the following fields:
   • Port: Select the port to monitor.
   • Description: (Optional) Describe the port.
   • Enable: Toggle to enable or disable PoE Watchdog for this port.
   • IP Address: Enter the IP address of the device to ping.
   • Send Packet Interval (s): Set the interval between ping packets.
   • Enable Delay Time (s): Set the delay time before enabling the PoE watchdog.
   • Retries: Configure the number of ping retries before considering the device unreachable.
   • Disable Time (s): Set the time to disable PoE before re-enabling it.

MONITORING

Port Statistics

For monitoring or even sometimes troubleshooting, the Flow Statistics displays in real time the flow of data with different units like Octets, Packets, Transmission Rate, and OutErrPackets.

To refresh the statistics, click on the “Refresh” button, and to clear all the statistics, click on the “Clear All” button.

To clear the data for a specific port, click on the “clear icon” under the operation column.

For more details, click on the “Exclamation mark icon” under the operation column next to each port.

Port Mirror

Mirroring refers to copying the packets from the specified source to the destination port. The specified source is called the mirroring source, the destination port is called the observing port, and the copied packet is called the mirroring packet.

Mirroring can make a copy of the original packet without affecting the normal processing of the original packet by the device, and send it to the monitoring device through the observation port to determine whether the service running on the network is normal.

GWN772x switch supports up to 4 groups. To configure/edit a group, click on the “Edit icon” under the operation column.

To start mirroring a port, first, select the Ingress (incoming traffic to the switch) Mirroring port, then select the Egress (outgoing traffic) Mirroring port, and then select from the drop-down list the Monitor port (Monitor port cannot be the same as the Mirroring port), please refer to the figure below:

Cable Test

The Cable Test can detect whether the cable connected to the switch is faulty and the location of the fault. Using this function can assist in the daily engineering installation diagnosis.

Please navigate to Maintenance → Cable Test.

Loopback Detection

The Loopback Detection feature helps prevent self-looping on a port, which can disrupt the normal operation of the network. When loopback detection is enabled on a port, if a loop is detected, the port will automatically shut down or take appropriate measures.

Configuration:

1. Navigate to Monitoring → Loopback Detection on the GWN772x switch’s web UI.
2. Toggle Loopback Detection on or off.
3. Click OK to save the settings.

Loopback Detection

MAINTENANCE

Upgrade

GWN772x Switches support manual upload firmware upgrade via a BIN file that can be downloaded from the Grandstream Firmware page: https://www.grandstream.com/support/firmware

Upgrade Via Network is also supported by specifying the Firmware Server Path (For example, firmware.grandstream.com).

Backup & Restore

On this page, the user can back up the configuration, restore from a previously saved configuration file, or factory reset the GWN772x.

• Backup: The current switch configuration can be exported and saved to your computer. In the future, if you need to restore this configuration, you can simply import the backup file.
• Restore: The switch configuration can be restored based on the imported configuration file. If the device fails to be restored, hold down the Pinhole button on the back of the switch for five seconds to restore the switch to factory settings.
• Factory Reset: After factory restoration, all configurations of the switch will be restored to factory defaults. Please use it with caution! You are recommended to back up the current configuration before factory restoration.

Ping

The user on this page can enter the IP Address or Hostname and then click “Start”, the results of the ping command will be shown below.

SNMP

The Simple Network Management Protocol (SNMP) feature allows network administrators to monitor and manage devices within the network. The SNMP feature can be configured to send notifications and traps to an SNMP manager, helping to ensure efficient network operations.

Global Settings – SNMP

The Global Settings tab in the SNMP section allows administrators to configure community strings for SNMPv2 operations.

To access SNMP Global Settings:

1. Navigate to Maintenance → SNMP → Global Settings.
2. Enable SNMP by toggling the switch to ON.

SNMP Global Settings Field Descriptions

Notification Management

The Notification Management tab allows the configuration of the SNMP trap server and port.

To configure the trap server:

1. Navigate to Maintenance → SNMP → Notification Management.
2. Set the following fields:
   • Server Address: Specify the IP address of the SNMP trap server.
   • UDP Port: Enter the port used for SNMP trap communication (default is 162).

Trap Event

The Trap Event tab allows administrators to select the specific events for which SNMP traps should be sent to the SNMP manager.

To configure SNMP traps:

1. Navigate to Maintenance → SNMP → Trap Event.
2. Enable the desired trap events by toggling their switches. The available events are:
   • Authentication Failed
   • Port Up/Down
   • Cold Start
   • Warm Start
   • STP Bridge
   • Port ErrDisable
   • PoE Power Supply
   • VLAN Creation
   • VLAN Deletion
   • Configuration File Distribution

LLDP

The Link Layer Discovery Protocol (LLDP) allows the switch to advertise its identity, capabilities, and status to neighboring devices in the network. LLDP helps administrators efficiently monitor and manage network devices by providing detailed information about devices connected to the network.

Global Settings

To access LLDP Global Settings:

1. Navigate to Maintenance → LLDP → Global Settings.
2. Enable LLDP by toggling the switch to ON.

When LLDP is disabled, the system provides two handling options:

• Filter: Stops LLDP packets at the device, using LLDP only for local neighbor information.
• Bridge: Forwards LLDP packets to other devices, enabling broader network discovery.

Select the desired LLDP handling method, then click OK.

LLDP Global Settings Field Descriptions

Port Settings

The Port Settings section allows the configuration of LLDP operation on a per-port basis. Users can specify how LLDP should behave on each port and select elements to include in the advertisements.

To configure LLDP per port:

1. Under the Global Settings tab, scroll down to Port Settings.
2. Click Edit next to the desired port to modify its LLDP configuration.

LLDP Port Settings Field Descriptions

Neighbor Info

The Neighbor Info tab provides detailed information about the devices connected to the switch via LLDP. This includes the identity, chassis ID, and port information for each neighboring device.

To access Neighbor Info:

1. Navigate to Maintenance → LLDP → Neighbor Info.
2. The page will display the following information for each neighboring device:
   • Local Port: The local port connected to the neighbor.
   • Chassis ID: The chassis ID of the neighboring device.
   • Neighbor Port ID: The port on the neighboring device that is connected to the switch.
   • Device Name: The name of the neighboring device.
   • System Description: A description of the neighboring device.
   • Survival Time (TTL): The remaining time before the neighbor’s LLDP data expires.
3. Click Refresh to update the information, or Delete to remove neighbor entries.

CHANGE LOG

This section documents significant changes to the GWN7721 Series user manual. Only major new features or major document updates are listed here. Minor updates for corrections or editing are not documented here.

Firmware Version 1.0.7.128

Product names: GWN7721, GWN7721P, GWN7721PE

• Added support for new model GWN7721PE.

Firmware Version 1.0.7.105

Product name: GWN7721, GWN7721P

• Added VLAN transparent transmission function for 802.1Q VLAN. [802.1Q PVID Settings]
• Added prompt to notify that VLAN 1 and the Management VLAN cannot be deleted when clicking “Delete All”. [802.1Q VLAN]
• Updated LLDP to display Link Aggregation information under the IEEE 802.3 TLV section. [LLDP]

Firmware Version 1.0.1.33

Product name: GWN7721, GWN7721P

• This is the initial release.

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