Linksys SLM224G4S manual Stacking Cable Failure, Inserting Too Many Units

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Appendix B

About Switch Stacking

It should be emphasized that when two stacks are combined, all of the configuration information for one of the stacks will be lost. Only the surviving master (after the discovery/election process completes) will maintain its configuration information.

The best practice to combine two stacks is to reset the switches in one stack to the factory defaults and then add the switches as described in the “Adding Units to a Running Stack” subsection of section “Normal (Self- Ordering) Stack).”

•If one of the merged stacks had neither a Master unit nor a Backup Master unit, then units belonging to this group will be inserted into the stack in the exact way as described in section “Replacing a Failed Stack Member in a Running Stack” above. The Master will either connect the running units to the stack using the current numbers or will renumber them as necessary. The process described in section ““Replacing a Failed Stack Member in a Running Stack” applies to this case as well.

It should be emphasized that any time two stacks are combined into one stack, there is no way to maintain the configuration for both sets of switches. All dynamic information of the units that belong to the portion of the stack that was not reelected to be the master will be relearned.

Stacking Cable Failure

In this example, let us assume that stacking connection cables failed and caused a stack split, as described in section “Splitting a Stack.” When the stacking cable connection is fixed and units are reconnected, it results in merging two stacks as described in section “Merging Two Stacks.”

This scenario is feasible only if the topology of the stack is Chain topology. Single stacking cable failure will not cause a stack split if a Ring topology is used.

Inserting Too Many Units

In this example, a user tries to insert too many units into a stack.

1.All units (existing and newly inserted) are powered on at the same time:

•A Master is elected following the Master Discovery and Master Election processes.

•All other units will shut down.

NOTE: In some extreme cases, due to a race condition during the boot process, some of the units might be connected and join the stack.

2.A running group of units is added to an existing stack, assuming each one of the stack groups has an elected Master. The total of existing units and inserted units would exceed the maximum allowed number of units in a stack, which is 6 units for SLM224G4S, or 4 units for SLM248G4S:

•Master Detection and Master Election processes would determine the master out of one of two combined stacking groups.

•When switches are added to a running stack, the Unit ID Allocation and Duplicate ID Conflict Resolution process will detect an error if too many switches are present in the stack, and no changes will be made to units that originally belonged

to the group managed by the newly elected master. The original switches will retain their ID assignments and configurations. The units that originally belonged to the group managed by the master that lost its master status will be shut down.

Standalone Unit Inserted into a Running Stack

Since the unit is in standalone mode it will not participate in a master discovery process (it will not look for a master and will not respond to master queries). As a result it will not join the stack but will continue to run as a standalone manageable unit.

The ports that are connected to the other units’ stacking links will not pass any traffic, and the master will consider them as failed stacking links and route all traffic around them.

24/48-Port 10/100 + 4-Port Gigabit Resilient Clustering Smart Switch with 2 Combo SFPs

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Contents Port or 48-Port 10/100 + Online Resources About This GuideAbout This Guide Icon DescriptionsTable of Contents Snmp Appendix B About Switch Stacking Appendix C GlossaryGigabit Ethernet Fiber Optic Cabling Appendix G Contact Information Appendix D SpecificationsIntroduction ChapterBack Panel Chapter Product OverviewProduct Overview Front PanelSLM248G4S Placement Options Chapter InstallationInstallation Pre-Installation ConsiderationsHardware Installation Desktop PlacementRack-Mount Placement Configuring Stacking Mode Uplinking the SwitchReplacing a Stacked Switch Connect port G1 on Unit 2 to port G2 on UnitConnect port G1 on Unit 3 to port G2 on Unit Login screen appears. Proceed to the Login section below Chapter Configuration Using Console InterfaceUsing the HyperTerminal Application Using telnetSystem Configuration Menu How to Use the Console InterfaceLogin Switch Main MenuManagement Settings User & Password SettingsSystem Information IP Configuration Security SettingsFile Management Network ConfigurationRestore System Default Settings Reboot SystemStack Configuration Help Port ConfigurationSystem Mode Port StatusDevice Information Chapter Configuration Using Web-based UtilitySetup Setup SummaryDNS Server The IP address of your ISP’s server that Setup ZoomSetup Network Settings Default Gateway The IP address default 0.0.0.0Daylight Saving Setup TimeIdentification Local TimeSntp Servers Setup Stack ManagementPort Management Port Settings Port ManagementPort Configuration Port Management Link Aggregation LAG ConfigurationPort Priority Lacp screen contains fields for configuring Lacp LAGsPort Management Lacp Global ParameterLacp Port Table Vlan Management Port SettingsVlan Management Vlan Management Create VlanVlan Management Port to Vlan Vlan Management Vlan to PortJoin Vlan to Port Statistics Rmon Statistics StatisticsRmon History Table Statistics Rmon HistoryRmon History Log TableAdd Alarm Statistics Rmon AlarmsStatistics Port Utilization Statistics Rmon EventsStatistics Interface Statistics Ethernet-like Security 802.1x SettingsSecurity InterfaceSecurity Port Security Setting TimerWeb IP Filtering Security Management Access ListSecurity Storm Control Security RadiusBroadcast Only Counts only Broadcast traffic CoS Settings screen is used to enable or disable CoS QoS CoS SettingsCoS Settings CoS DefaultQoS Queue Settings QoS Dscp SettingsQoS Bandwidth QoS Basic Mode Spanning TreeSpanning Tree STP Status Spanning Tree Global STP Spanning Tree STP Port SettingsGlobal Setting Bridge SettingsIgmp Global Vlan Igmp SettingsMulticast Multicast Igmp SnoopingMulticast Bridge Multicast Forward All Multicast Bridge MulticastSnmp Views Snmp Global ParametersSnmp Group Profile Snmp Group MembershipUser Name Provides a user-defined local user list Snmp Communities Advanced Table Snmp Notification FilterSnmp Notification Recipient Base TableLocal User Edit AdminAdmin User Authentication User AuthenticationClear Table If selected, this clears the MAC Address table Admin Static AddressAdmin Dynamic Address Secure The entry is defined for locked portsAdmin Port Mirroring Admin Cable TestQuery Admin Save Configuration Admin Firmware Upgrade Admin RebootAdmin Factory Default Admin Logging Admin Server LogsAdmin Memory Logs Logout Admin Flash LogsFiber Optic Cabling Appendix aAppendix a About Gigabit Ethernet Fiber Optic Cabling Gigabit EthernetStack Building Quick Start Appendix B About Switch StackingAbout Switch Stacking Appendix BUnit ID Allocation Advanced StackingStack Resiliency Unit IDsStack Units Startup Process Master DiscoveryMaster Election Replacing a Failed Stack Member in a Running Stack Unit and Port ConfigurationUser Controls Stacking ExamplesStack Master Failure and Replacement Splitting a Stack Subgroup Contains Both Master Unit and Backup Master UnitBoth Stacks Kept Running During Insertion Merging Two StacksInserting Too Many Units Stacking Cable FailureAppendix C Appendix C GlossaryGlossary Glossary Mail protocol on the Internet Packet a unit of data sent over a networkAppendix C Appendix D Specifications SpecificationsAppendix D 802.3 10BASE-T Ethernet DimensionsHOL Blocking Head of line blocking prevention Supports up to 9K byte framesAppendix E Warranty InformationLimited Warranty Obtaining Warranty ServiceTechnical Support Warranty InformationRegulatory Information Appendix FRegulatory Information Appendix F Norsk Norwegian Miljøinformasjon for kunder i EU Appendix F Contact Information Appendix G

SLM224G4S specifications

The Linksys SLM224G4S is a sophisticated Layer 2 managed switch designed for businesses and institutions that demand high performance, reliability, and advanced networking features. This model stands out due to its blend of robustness and manageability, making it ideal for expanding networks.

One of the primary features of the SLM224G4S is its 24 Gigabit Ethernet ports, allowing for high-speed data transfers essential for bandwidth-intensive applications. Supporting auto-negotiation, these ports can detect the capabilities of connected devices and configure themselves accordingly, ensuring optimal performance without manual intervention. With four additional shared Gigabit SFP (Small Form-factor Pluggable) ports, this switch provides flexibility in network design and enhances scalability.

The SLM224G4S supports VLAN (Virtual Local Area Network) capabilities, which can segment network traffic to improve security and performance. This is particularly useful in environments where different departments or teams require distinct network segments for operational efficiency. By implementing VLANs, organizations can enhance their network management while isolating sensitive information from potential threats.

Quality of Service (QoS) is another critical technology integrated into the SLM224G4S. It prioritizes network traffic, ensuring that critical applications receive the bandwidth they need for optimal performance. This is particularly important for VoIP and video conferencing applications, where latency and jitter can significantly impact user experience.

The switch also features advanced Layer 2 management functionalities, including SNMP (Simple Network Management Protocol), allowing IT administrators to monitor network performance and quickly troubleshoot issues. The embedded web-based management interface makes configuration straightforward, enabling quick adjustments to settings without deep networking knowledge.

Security is a paramount consideration in today’s networking landscape. The SLM224G4S provides robust security features, including port security that limits the number of MAC addresses allowed on a port, reducing the risk of unauthorized access. Moreover, it supports802.1X port-based authentication, ensuring that only authenticated devices can connect to the network.

In summary, the Linksys SLM224G4S managed switch boasts features such as 24 Gigabit Ethernet ports, VLAN support, QoS, SNMP management, and advanced security protocols. These characteristics make it an excellent choice for businesses looking to enhance their network's performance, safety, and reliability, paving the way for seamless connectivity in today’s digital age.
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