Linksys SLM224G4S manual Merging Two Stacks, Both Stacks Kept Running During Insertion

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Appendix B

About Switch Stacking

before the split. Since the Backup Master was not acting as a master prior to the split, it will initiate a topology database and port-learning process. Traffic might be halted for a short period of time until synchronization (unit and port configuration) is completed. New units learned by the Backup Master will notify the system administrator (using SYSLOG messages and SNMP traps).

d.In either case (steps b and c above), the subgroup will continue to work as it did before the split, except that the number of units is lower than prior to the split.

e.No unit ID changes are made in either subgroup.

f.Each new stack will have a Master (one has the original Master, the other has the Backup). They thus operate as two separate stacks, both having the same configuration and hence the same IP address.

WARNING: Both resulting stacks will have the same IP Address. This may lead to problems on the network, since there would be no way for users to connect to one of the stacks through its IP address.

Subgroup Contains Neither Master Unit nor Backup Master Unit

Please note that this is exactly the same as the case of a failed master, where no backup is available.

•In this case the units with ID 3-6 (3-4 for SLM248G4S) in this subgroup will not renumber themselves, and will remain shut down until a stack Master enabled unit is connected, and starts to operate as stack master. It is the responsibility of the Master-discovery process to see that the master is gone.

•In this subgroup, the units lose connection with the Master. Since they started as a running stack and none of them are in factory default mode, renumbering will not take place, and even a Reset of the units will not affect unit ID assignment (As noted above, units can be renumbered only by a stack Master).

•No unit ID changes are made in either subgroup.

Again it should be emphasized that none of the units in either half of the stack will renumber themselves.

Merging Two Stacks

In this example, the user would like to merge two working stacks and create one stack out of those two stacks. In this example one should distinguish between two scenarios:

•The incoming units are turned off before insertion and then powered back up afterward

•The two stacks are kept running during the insertion (for example, the stacking cables of the two stacks are connected)

Incoming Units Turned Off Before Insertion, then Turned On After Insertion

This is exactly the same as inserting units into a running stack (refer to “Replacing a Failed Stack Member in a Running Stack”). The only difference is that more than one unit will be inserted into the stack and therefore for each unit inserted to the stack the same process will be executed.

Both Stacks Kept Running During Insertion

If each of the joined stacks has a Master unit, both Master units will perform Master discovery and participate in a Master Election, as described above. One of the Master units will be selected as the Master unit—for the merged stack. The criteria for choosing the master are:

•Force Master

•System Up Time

•Lowest Unit ID

•Lowest MAC

The process of master selection between the two master units is as follows:

•If force master is enabled then the unit which is forced is chosen.

•Up time is measured by quantities of periods of 10 minutes. If the number of 10 minute periods is higher for one of the units then this unit is chosen.

•If both units have the same up time (measured in periods of 10 minutes) the unit with the lowest unit ID is elected.

•If both Master unit IDs are equal the unit with the Lower MAC is chosen.

•The Master unit that loses its“mastership”in the Master election process will be renumbered if the unit ID was dynamically allocated. renumbering will now allocate it a new number by the new Master, as a stack member, or possibly Backup Master. It should be emphasized that in no case will there be two units with the same Unit ID at the end of this process.

•The Master unit that loses its mastership in the Master election process will be shut down if the unit ID was manually allocated. It is recommended that the administrator configure it to auto-assigned Unit ID before reconnecting it to the stack.

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Contents Port or 48-Port 10/100 + Icon Descriptions About This GuideAbout This Guide Online ResourcesTable of Contents Snmp Gigabit Ethernet Fiber Optic Cabling Appendix B About Switch StackingAppendix C Glossary Appendix D Specifications Appendix G Contact InformationChapter IntroductionFront Panel Chapter Product OverviewProduct Overview Back PanelSLM248G4S Pre-Installation Considerations Chapter InstallationInstallation Placement OptionsRack-Mount Placement Hardware InstallationDesktop Placement Uplinking the Switch Configuring Stacking ModeConnect port G1 on Unit 3 to port G2 on Unit Replacing a Stacked SwitchConnect port G1 on Unit 2 to port G2 on Unit Using telnet Chapter Configuration Using Console InterfaceUsing the HyperTerminal Application Login screen appears. Proceed to the Login section belowSwitch Main Menu How to Use the Console InterfaceLogin System Configuration MenuSystem Information Management SettingsUser & Password Settings Security Settings IP ConfigurationNetwork Configuration File ManagementStack Configuration Restore System Default SettingsReboot System Port Status Port ConfigurationSystem Mode HelpSetup Summary Chapter Configuration Using Web-based UtilitySetup Device InformationDefault Gateway The IP address default 0.0.0.0 Setup ZoomSetup Network Settings DNS Server The IP address of your ISP’s server thatLocal Time Setup TimeIdentification Daylight SavingPort Management Setup Stack ManagementPort Management Port Settings Sntp ServersPort Configuration LAG Configuration Port Management Link AggregationGlobal Parameter Lacp screen contains fields for configuring Lacp LAGsPort Management Lacp Port PriorityVlan Management Create Vlan Vlan Management Port SettingsVlan Management Lacp Port TableJoin Vlan to Port Vlan Management Port to VlanVlan Management Vlan to Port Statistics Statistics Rmon StatisticsLog Table Statistics Rmon HistoryRmon History Rmon History TableStatistics Rmon Alarms Add AlarmStatistics Interface Statistics Statistics Port UtilizationStatistics Rmon Events Interface Security 802.1x SettingsSecurity Ethernet-likeSetting Timer Security Port SecuritySecurity Management Access List Web IP FilteringBroadcast Only Counts only Broadcast traffic Security Storm ControlSecurity Radius CoS Default QoS CoS SettingsCoS Settings CoS Settings screen is used to enable or disable CoSQoS Bandwidth QoS Queue SettingsQoS Dscp Settings Spanning Tree STP Status QoS Basic ModeSpanning Tree Bridge Settings Spanning Tree STP Port SettingsGlobal Setting Spanning Tree Global STPMulticast Igmp Snooping Vlan Igmp SettingsMulticast Igmp GlobalMulticast Bridge Multicast Multicast Bridge Multicast Forward AllSnmp Global Parameters Snmp ViewsUser Name Provides a user-defined local user list Snmp Group ProfileSnmp Group Membership Snmp Communities Base Table Snmp Notification FilterSnmp Notification Recipient Advanced TableUser Authentication AdminAdmin User Authentication Local User EditSecure The entry is defined for locked ports Admin Static AddressAdmin Dynamic Address Clear Table If selected, this clears the MAC Address tableQuery Admin Port MirroringAdmin Cable Test Admin Save Configuration Admin Factory Default Admin Firmware UpgradeAdmin Reboot Admin Memory Logs Admin LoggingAdmin Server Logs Admin Flash Logs LogoutGigabit Ethernet Appendix aAppendix a About Gigabit Ethernet Fiber Optic Cabling Fiber Optic CablingAppendix B Appendix B About Switch StackingAbout Switch Stacking Stack Building Quick StartUnit IDs Advanced StackingStack Resiliency Unit ID AllocationMaster Election Stack Units Startup ProcessMaster Discovery Stacking Examples Unit and Port ConfigurationUser Controls Replacing a Failed Stack Member in a Running StackStack Master Failure and Replacement Subgroup Contains Both Master Unit and Backup Master Unit Splitting a StackMerging Two Stacks Both Stacks Kept Running During InsertionStacking Cable Failure Inserting Too Many UnitsGlossary Appendix CAppendix C Glossary Glossary Packet a unit of data sent over a network Mail protocol on the InternetAppendix C Appendix D Appendix D SpecificationsSpecifications Supports up to 9K byte frames DimensionsHOL Blocking Head of line blocking prevention 802.3 10BASE-T EthernetObtaining Warranty Service Warranty InformationLimited Warranty Appendix EWarranty Information Technical SupportAppendix F Regulatory InformationRegulatory Information Appendix F Norsk Norwegian Miljøinformasjon for kunder i EU Appendix F Appendix G Contact Information

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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