Linksys SLM224G4S Splitting a Stack, Subgroup Contains Both Master Unit and Backup Master Unit

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Appendix B

•If the incoming unit already has an assigned Unit ID, and that Unit ID is unused in the current stack, the incoming unit will keep its assigned Unit ID and the Master will apply to it any configuration relevant to that Unit ID.

•If the incoming unit already has an assigned Unit ID, and that Unit ID conflicts with a unit ID in the current stack, the Master will reallocate a new Unit ID to the incoming unit, giving it the lowest available Unit ID (assuming, of course, that the incoming unit does not have a manually assigned Unit ID, which the Master cannot change).

•If the incoming unit cannot be assigned an available Unit ID for any reason (in the case of unit replacement that can only happen if the incoming unit has a manually assigned Unit ID), then it will be effectively shut down—that is, it will not be joined to the stack.

3.The stack Master will now carry out Unit and port configuration for the incoming unit.

•Any configuration information the Master has that is relevant to the number assigned to the incoming unit will be applied. In particular, if the incoming unit was assigned the same Unit ID of the unit it replaces, then it will receive the same configuration as the failed unit, to the extent possible, as described in section “Replacing a Failed Stack Member in a Running Stack“ above.

Splitting a Stack

In this example, let us assume that a working stack is split into two groups, either by failure of a stacking link connecting two units in the stack or by a failed unit in a chain topology which causes disconnection between two units in the stack. In this case we should consider each subgroup as an independent running stack configuration. For each subgroup three suboptions will be considered:

•Both the Master unit and the Backup master unit are part of the subgroup.

•Either the Master unit or the Backup master unit are part of the subgroup.

•Neither the Master unit nor the Backup Master unit are part of the subgroup.

The following describes what happens within each subgroup for each of these three suboptions.

Subgroup Contains Both Master Unit and Backup Master Unit

•Nothing changes, except the master sees the missing units as having been removed, and routes traffic around them, as described in section “Replacing a Failed Stack Member in a Running Stack” above.

About Switch Stacking

•Since this subgroup contains both master and backup, the subgroup works, and the other subgroup will not work. Refer to step 3 below for detailed information.

•The sequence of actions is as follows:

a.The Master Discovery, Master Election and Unit ID Allocation & Duplicate Unit ID Conflict Resolution processes will be executed.

b.Any configuration information that the Master has that is relevant to the units remaining in the subgroup will remain unchanged.

c.Topology information (the information for each unit on how to send traffic to any other unit in the stack) managed by the master will include only units that are reachable (connected) following the split.

d.The subgroup continues to work as before, except that the number of the unit is lower than prior to the split.

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

f.The Master notifies the system administrator (using SYSLOG messages and SNMP traps) of the removed units and ports which belong to the unreachable units and will be reported as ‘not present’.

Subgroup Contains Either Master Unit or Backup Master Unit

•If the Master unit remains in this subgroup, this is the same as described in section “Replacing a Failed Stack Member in a Running Stack” above. If the Backup Master unit remains in this subgroup, then this is the same as section “Stack Master Failure and Replacement” above.

•It should be emphasized that if the stack is split into two parts, one with the master and one with the backup, both parts will work.

•The sequence of actions is as follows:

a.The Master Discovery, Master Election and Unit ID Allocation & Duplicate Unit ID Conflict Resolution processes will be executed.

b.If the subgroup contains the Master unit, the stack Master notices (using the master detection process) that some units no longer respond. At the same time the stack Master notifies the system administrator (using SYSLOG messages and SNMP traps) of the removed units and ports which belong to the unreachable units and will be reported as ‘not present’.

c.If the subgroup contains the Backup Master unit, the Backup Master will see as a case of Master failure and take over and manage the remaining units as a stack, while keeping its number as it was

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Contents Port or 48-Port 10/100 + About This Guide About This GuideIcon Descriptions Online ResourcesTable of Contents Snmp Appendix C Glossary Appendix B About Switch StackingGigabit Ethernet Fiber Optic Cabling Appendix G Contact Information Appendix D SpecificationsIntroduction ChapterProduct Overview Chapter Product OverviewFront Panel Back PanelSLM248G4S Installation Chapter InstallationPre-Installation Considerations Placement OptionsDesktop Placement Hardware InstallationRack-Mount Placement Configuring Stacking Mode Uplinking the SwitchConnect port G1 on Unit 2 to port G2 on Unit Replacing a Stacked SwitchConnect port G1 on Unit 3 to port G2 on Unit Using the HyperTerminal Application Chapter Configuration Using Console InterfaceUsing telnet Login screen appears. Proceed to the Login section belowLogin How to Use the Console InterfaceSwitch Main Menu System Configuration MenuUser & Password Settings Management SettingsSystem Information IP Configuration Security SettingsFile Management Network ConfigurationReboot System Restore System Default SettingsStack Configuration System Mode Port ConfigurationPort Status HelpSetup Chapter Configuration Using Web-based UtilitySetup Summary Device InformationSetup Network Settings Setup ZoomDefault Gateway The IP address default 0.0.0.0 DNS Server The IP address of your ISP’s server thatIdentification Setup TimeLocal Time Daylight SavingPort Management Port Settings Setup Stack ManagementPort Management Sntp ServersPort Configuration Port Management Link Aggregation LAG ConfigurationPort Management Lacp Lacp screen contains fields for configuring Lacp LAGsGlobal Parameter Port PriorityVlan Management Vlan Management Port SettingsVlan Management Create Vlan Lacp Port TableVlan Management Vlan to Port Vlan Management Port to VlanJoin Vlan to Port Statistics Rmon Statistics StatisticsRmon History Statistics Rmon HistoryLog Table Rmon History TableAdd Alarm Statistics Rmon AlarmsStatistics Rmon Events Statistics Port UtilizationStatistics Interface Statistics Security Security 802.1x SettingsInterface Ethernet-likeSecurity Port Security Setting TimerWeb IP Filtering Security Management Access ListSecurity Radius Security Storm ControlBroadcast Only Counts only Broadcast traffic CoS Settings QoS CoS SettingsCoS Default CoS Settings screen is used to enable or disable CoSQoS Dscp Settings QoS Queue SettingsQoS Bandwidth Spanning Tree QoS Basic ModeSpanning Tree STP Status Global Setting Spanning Tree STP Port SettingsBridge Settings Spanning Tree Global STPMulticast Vlan Igmp SettingsMulticast Igmp Snooping Igmp GlobalMulticast Bridge Multicast Forward All Multicast Bridge MulticastSnmp Views Snmp Global ParametersSnmp Group Membership Snmp Group ProfileUser Name Provides a user-defined local user list Snmp Communities Snmp Notification Recipient Snmp Notification FilterBase Table Advanced TableAdmin User Authentication AdminUser Authentication Local User EditAdmin Dynamic Address Admin Static AddressSecure The entry is defined for locked ports Clear Table If selected, this clears the MAC Address tableAdmin Cable Test Admin Port MirroringQuery Admin Save Configuration Admin Reboot Admin Firmware UpgradeAdmin Factory Default Admin Server Logs Admin LoggingAdmin Memory Logs Logout Admin Flash LogsAppendix a About Gigabit Ethernet Fiber Optic Cabling Appendix aGigabit Ethernet Fiber Optic CablingAbout Switch Stacking Appendix B About Switch StackingAppendix B Stack Building Quick StartStack Resiliency Advanced StackingUnit IDs Unit ID AllocationMaster Discovery Stack Units Startup ProcessMaster Election User Controls Unit and Port ConfigurationStacking Examples Replacing a Failed Stack Member in a Running StackStack 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 Glossary Appendix CGlossary Glossary Mail protocol on the Internet Packet a unit of data sent over a networkAppendix C Specifications Appendix D SpecificationsAppendix D HOL Blocking Head of line blocking prevention DimensionsSupports up to 9K byte frames 802.3 10BASE-T EthernetLimited Warranty Warranty InformationObtaining Warranty Service Appendix ETechnical 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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