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Understanding Access Control Lists (ACLs)
In the realm of network management and security, Access Control Lists (ACLs) play a crucial role. This article aims to provide a comprehensive understanding of what ACLs are, how they function, and their significance in network security and traffic management. What is an ACL? An Access Control List (ACL) is a set of rules…
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How to Address a Broadcast/Multicast Storm in Your Network Environment?
Broadcast and multicast storms can severely degrade network performance by overwhelming the network with a flood of traffic. Here are steps to identify and mitigate broadcast/multicast storms in your network environment. Identify the Source of the Storm: Use Network Monitoring Tools: Deploy network monitoring tools to…
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How can I tell which models (XGS1210-12/XGS1250-12) support Smart Fan Control?
Smart Fan Control is a feature designed to manage the fan's speed based on the internal temperature of the switch to ensure optimal operation and device longevity. At the time of writing, this setting option is supported on the B1 hardware revision of XGS1250-12. Please refer to the table below for model compatibility:…
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Smart Fan Control Feature on XGS1250-12 Switch
What is Smart Fan Control? Smart Fan Control is a feature in the XGS1250-12 Switch that adjusts the fan speed based on the internal temperature of the device to ensure optimal performance and prolong the device's lifespan. How does Smart Fan Control work? Navigate to the 'Management' tab > scroll down to find the 'Smart…
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What occurs as the stacking cable between the backup and linecard is disconnected in Daisy chain?
If the stacking cable (CH2, representing Orange) between the 2nd and 3rd switches is disconnected in Daisy chain, the switch in the linecard role will not perform any actions, including changing its role or retaining the running configuration. This is the expected behavior for a switch that is not in the Master or Backup…
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Network Stability Through Broadcast Storm Control in Loop Scenarios
When a network loop occurs, as illustrated between Switch 1 (SW 1) and Switch 2 (SW 2), there is a risk of broadcast traffic being multiplied, which can overload the switch's CPU and disrupt network operations. Enabling Broadcast Storm Control on a port that participates in the loop — for example, port 9 on SW 1 — provides…
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How Do I Configure Broadcast Storm Control on a Zyxel GS1200 Series Switch?
Scenario: In a busy network, devices can send out a large number of broadcast packets simultaneously. This can overwhelm the network, causing a 'broadcast storm,' which may lead to network slowdowns or even a complete halt in traffic. Broadcast Storm Control is a feature that helps prevent this by setting a limit on the…
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Layer 2 Switch DNS Resolution Issue
Users may encounter an issue when using a switch to ping domain names (e.g., yahoo.com), though they can ping IP addresses directly. The switch is designed to use the default management VLAN for DNS queries. When attempting to resolve domain names using a non-default VLAN (like VLAN 10), the switch fails to receive a…
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Configuring DHCP Option 82 on Zyxel Switch in Standalone mode
Zyxel switches offer two distinct methods for users to configure DHCP Option 82. 1. Using DHCP Relay: Navigate to Networking > DHCP > DHCPv4 Relay > DHCP Relay VLAN setting. You can create DHCP Option 82 settings either for an entire VLAN or for specific ports. This method allows the switch to forward DHCP requests with…
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How do DHCP Server Guard's functionalities differ in standalone mode and cloud mode?
The behavior of DHCP Server Guard varies based on the mode of operation: Cloud Mode: In this mode, only the first DHCP server that assigned an IP address to the Nebula device is permitted to assign IP addresses to devices in the management VLAN. Standalone Mode: Allows setting multiple trusted ports for DHCP servers,…
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When should you choose DHCP Server Guard over DHCP Snooping?
DHCP Server Guard is the preferred choice if your primary requirement is to block untrusted DHCP servers without needing to record the packet details. It is also more CPU resource-efficient. Conversely, opt for DHCP Snooping when there is a need to block untrusted DHCP servers and simultaneously record trusted DHCP server…
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What are the key differences between DHCP Server Guard and DHCP Snooping?
DHCP Server Guard and DHCP Snooping are two distinct features with different operational mechanisms and purposes: DHCP Server Guard: This feature uses hardware ACL to control the passage of DHCP packets based on the trust status (trusted/untrusted) of a port. It does not record IP/MAC information to a table. DHCP Snooping:…
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Configuring switch stacking on Nebula (Pro pack required)
This article provides instructions on configuring stacking in Nebula. Stacking is currently available for XS3800 switches, with support for up to 4 switches in a stack. Switch stacking requires the Pro Pack license, and this article covers adding or replacing a switch in the stack, best practices for switch stacking,…
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How to configure SNMP on a switch?
Simple Network Management Protocol (SNMP) is an application layer protocol utilized for the management and monitoring of TCP/IP-based devices. SNMP facilitates the exchange of management information between the Network Management System (NMS) and a Network Element (NE). In an SNMP-managed network, there are two primary…
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What switch models support jumbo frame?
Zyxel offers various switch models that support jumbo frames. Jumbo frames allow for larger Ethernet frames than the standard 1500-byte frames, which can be useful in certain networking scenarios, such as data center environments or when transferring large files. Jumbo frame is enabled by default, with support for frame…
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What is the authentication and privacy algorithm for SNMPv3?
Users may have difficulty configuring SNMPv3 entry for communication between switches and SNMP tool/server due to algorithm mismatched since the web GUI does not explicitly display. Here is the algorithm that Zyxel Switch has: Authentication: MD5 / SHA-1 Privacy: DES56 / AES-128
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How to configure RSTP in a ring topology (V4.80 version)
If your switch firmware version is V4.70 or previous version, please reference this FAQ The example shows administrators how to set up RSTP (Rapid Spanning Tree Protocol) in the ring topology to implement network redundancy. Note: All network IP addresses and subnet masks are used as examples in this article. Please…
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How to set up Ringv2 (Fast Ring Protection) on RGS-200?
Scenario Ringv2 (Fast Failover Ring Protection) is a special type of link-layer protocol specially designed for constructing the ring Ethernet topology. It can shut down one link in a complete ring topology, preventing the data loop from forming the broadcast storm. If a link is broken, the protocol immediately resumes the…
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Why my GS1900 cannot forward traffic to other device via LACP port?
Make sure the link aggregation setting and media type are the same on the GS1900 and the connecting device. GS1900 will ignore the VLAN setting on member ports of the LAG group when LACP/LAG is set. Please check if the LAG group hasn't been fixed on a specific VLAN in the VLAN setting.
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Why cannot my stacking switches connect by DAC cable?
Some users might have stacking switches that cannot connect with a DAC cable. This is because the media type of stacking port is incorrect. Please change to the correct media type to ensure stacking stability. The configuration path is based on XGS2220 v4.80 patch 2 firmware. Configuration path: System > Stacking >…