Linksys SLM224G4S manual User Controls, Stacking Examples, Unit and Port Configuration

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Appendix B

About Switch Stacking

•If both duplicate units are in auto (self ordering) mode, then the unit ID will be decided by the Mac address. The unit with the lower Mac will keep its unit ID. The other will be reassigned a new unit ID.

•If one of the duplicates is in auto (self ordering) mode and the other unit is in manual mode then the manual mode unit will keep its ID and the other will be reassigned a new unit ID.

•If both duplicate units are in manual mode then both of them will be shut down.

If the stack Master is able to allocate a unique Unit ID to each unit, then all units can operate as a stack. If the stack Master is unable to allocate a Unit ID to any unit, that unit is effectively shut down and will not participate in the stack.

In particular, units with a conflicting manually set Unit ID number will be shut down because the Master cannot override the system administrator’s assignment to resolve the conflict.

If there are more units than the maximum number allowed in a stack and the incoming units are already in factory default state (which means they do not have unit ID assigned) then a Master will be elected following Master Discovery and Master Election processes. All other units will remain shut down. Please note that in some extreme cases, due to a race condition during the boot process, some of the units might be connected and join the stack.. If the incoming units already have a unit ID then none of them will join the stack and all will be left in shutdown mode (since there is no way to know which of them are preferable).

NOTE: If a unit is shut down, its stacking links will be inactive. Moreover, if the stacking units are connected in a chain topology, the shutdown of one unit breaks the chain and may cause other units to be shut down if they have no active link to the Master unit.

Unit and Port Configuration

At this point, each unit in the stack has a unique Unit-ID; one of the units is the stack Master, and, possibly, one of the units serves as Backup Master. The stack Master will now configure each of the member units and its ports according to the configuration file present on the Master.

If the stack has a Backup Master the configuration file will also be copied to the Backup Master.

Once all the units and ports are configured, the stack will go into normal operational mode. If any change is made to the system configuration, the change will be stored by

the stack Master and will be copied to the Backup Master (if it exists).

User Controls

Using either the CLI or the graphical user interface (GUI), the user can configure the following settings:

•Set the operational mode of the unit (which will take effect after next reboot) – Standalone or Stack.

•Force a unit to be the stack Master after the next reset

•Assign a static Unit ID, or, allow the unit to be renumbered.

Stacking Examples

Replacing a Failed Stack Member in a Running Stack

In this example, a non-master unit fails in a running stack. When notified of the failure, a system administrator removes the failed unit and replaces it with another one.

When the unit fails, the stack Master detects (via the ongoing Master Discovery process) that the unit no longer responds, and directs all other stack members to route unit-to-unit traffic around the failed unit using the ring topology of the stacking connections. At the same time the stack Master notifies the system administrator (using SYSLOG messages and SNMP traps) of the failure.

When the failed unit is disconnected from the stack, all traffic will already be routed around it, and as long as all other stacking connections are left intact, the stack should continue to run.

When a new unit is inserted in the stack and powered up, the following will happen:

1.The incoming unit, being in stack mode, will perform Master discovery, and perhaps participate in a Master Election, as described above for any stacking-mode unit powering up.

•If the incoming unit has a Unit ID of 1 or 2, i.e. it is a master enabled unit, it will initiate a Master Election. However, since the running stack Master has a longer run time, it will remain elected as the stack Master and the incoming unit will not become a new stack Master.

•If the incoming unit has a Unit ID of 3 to 6 (3 to 4 for SLM248G4S), it will try to become a member unit of the stack subject to the already running stack Master, and Master Election will not take place.

2.The stack Master at this stage will carry out a Unit ID allocation and conflict resolution process.

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 Gigabit Ethernet Fiber Optic Cabling Appendix B About Switch StackingAppendix C Glossary Appendix G Contact Information Appendix D SpecificationsIntroduction ChapterBack Panel Chapter Product OverviewProduct Overview Front PanelSLM248G4S Placement Options Chapter InstallationInstallation Pre-Installation ConsiderationsRack-Mount Placement Hardware InstallationDesktop Placement Configuring Stacking Mode Uplinking the SwitchConnect port G1 on Unit 3 to port G2 on Unit Replacing a Stacked SwitchConnect port G1 on Unit 2 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 MenuSystem Information Management SettingsUser & Password Settings IP Configuration Security SettingsFile Management Network ConfigurationStack Configuration Restore System Default SettingsReboot System 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 VlanJoin Vlan to Port Vlan Management Port to VlanVlan Management Vlan to Port Statistics Rmon Statistics StatisticsRmon History Table Statistics Rmon HistoryRmon History Log TableAdd Alarm Statistics Rmon AlarmsStatistics Interface Statistics Statistics Port UtilizationStatistics Rmon Events Ethernet-like Security 802.1x SettingsSecurity InterfaceSecurity Port Security Setting TimerWeb IP Filtering Security Management Access ListBroadcast Only Counts only Broadcast traffic Security Storm ControlSecurity Radius CoS Settings screen is used to enable or disable CoS QoS CoS SettingsCoS Settings CoS DefaultQoS Bandwidth QoS Queue SettingsQoS Dscp Settings Spanning Tree STP Status QoS Basic ModeSpanning Tree 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 ParametersUser Name Provides a user-defined local user list Snmp Group ProfileSnmp Group Membership 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 portsQuery Admin Port MirroringAdmin Cable Test Admin Save Configuration Admin Factory Default Admin Firmware UpgradeAdmin Reboot Admin Memory Logs Admin LoggingAdmin Server 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 IDsMaster Election Stack Units Startup ProcessMaster Discovery 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 FailureGlossary Appendix CAppendix C Glossary Glossary Mail protocol on the Internet Packet a unit of data sent over a networkAppendix C Appendix D Appendix D SpecificationsSpecifications 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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