Cisco Systems SLM248G4PS manual Appendix B About Switch Stacking, Stack Building Quick Start

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Appendix B

Appendix B:

About Switch Stacking

A switch may operate in one of two modes: Stack or Standalone. You can select either mode during software boot or using the web-based utility’s Setup > Summary screen, with the new mode taking effect after the unit is reset. The factory default is Stack mode.

Standalone Mode

A switch operating in Standalone mode runs as an independent, single unit. All ports of a standalone switch operate as normal Ethernet links. A Standalone switch does not participate in a Stack even if physically connected to a Stack.

Stack Mode

A switch operating in Stack mode is not an independent unit, but a member of an organized group of switches known as a Stack. A Stack consists of one Master control switch, a Master Backup switch, and up to four Stack Member SLM224G4PS switches, or up to two Stack Member SLM248G4PS switches.

•As a special case, a unit in Stack mode not connected to any other units may operate as a “stack–of-one”.

NOTE: When a unit is in Stack mode, two of its ports are reserved for use with stacking links, and cannot be used for regular network connections.

Two ports of each unit in Stack mode (ports G1 and G2) are reserved for stacking links, and cannot be used for regular network connections.

Stack Building Quick Start

Stacking allows you to build a switch with many more ports than would be available in a single unit. The stack is managed by one of the units called the Master and all the other units serve as ports only.

When building a stack there are two distinct cases:

•Building a stack from scratch

•Adding units to a running (operational) stack to make it bigger

Normal (Self-Ordering) Stack

The easiest way to build a stack is to have the switches’ automatically determine their order in the stack.

About Switch Stacking

Building a New Stack

To build a new self-ordering stack, use a group of switches, each of which is set to the factory defaults.

All that is necessary to do is to connect the units physically (through the stacking ports, using standard Ethernet cables) and turn the units on. After a short interval the stack will become operational with one of the units selected as the Master of the stack. The unit selected as Master will be indicated by the Stack Master LED on its front panel lit amber. If a serial console connection is desired, the serial cable should be connected to the console port of the unit serving as stack Master.

If the units to be used in building the new stack were used before then it is highly recommended to reset them back to factory default (by holding the reset button for at least 10 seconds) and proceeding as described above.

Adding Units to a Running Stack

Restore the factory defaults to each of the units to be added to the stack. Then connect the units physically to the stack and turn the units on. After a short while the new units will become stack members.

Manually Ordered Stack

The system administrator can manually decide which unit will be the Master. To do that the system administrator has to assign a unique Unit ID from 1 to 6 (1 to 4 for SLM248G4PS-only stacks) to each stack member.

NOTE: It is highly recommended that if any unit is assigned its Unit ID manually, then all the units be assigned their Unit IDs manually.

It is NOT recommended to have a mixed case with some Unit IDs assigned manually, and others automatically allocated at runtime by the stack Master (even though such a mixed stack may well function flawlessly).

Building a New Stack

Reset all of the units to the factory defaults and build the stack as described above in“Normal (Self-Ordering) Stack”. Then, when the stack is operational, assign each unit with its desired number, making sure no duplicates exist, and reset the stack.

Adding Units to a Running Stack

Restore the factory defaults to each of the units to be added to the stack. Then, connect the units physically to the stack and turn the units on. After a short while they will become stack members, but will have auto-assigned Unit IDs. Assign each such unit its desired Unit ID (using

24/48-Port 10/100 + 4-Port Gigabit Smart Switch with Resilient Clustering Technology and PoE

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Contents Port or 48-Port 10/100 + About This Guide About This GuideIcon Descriptions Online ResourcesTable of Contents Snmp Global Parameters Snmp Views Snmp Group Profile SnmpGigabit Ethernet Fiber Optic Cabling Appendix B About Switch StackingAppendix G Contact Information Appendix C Glossary Appendix D SpecificationsIntroduction ChapterChapter Product Overview Switch LEDs and ports are located on the front panelProduct Overview Front PanelPower The Power port is where you connect the AC power Switch’s LEDs and ports are located on the front panelBack Panel Product Overview Installation Chapter InstallationPre-Installation Considerations Placement OptionsHardware Installation Desktop PlacementRack-Mount Placement Uplinking the Switch Configuring Stack ModeTo set up a stack with six switches, follow these steps Power off the new unit 5 the former master unit Connect port G1 on Unit 2 to port G2 on UnitConnect port G1 on Unit 3 to port G2 on Unit Chapter Configuration Using Console Interface Using telnetLogin screen appears. Proceed to the Login section below Login How to Use the Console InterfaceSwitch Main Menu System Configuration MenuSystem Information Management SettingsUser & Password Settings Security SettingsIP Configuration Http Reboot System Restore System Default SettingsStack Configuration File ManagementPort Status Menu Port ConfigurationPoE Settings System ModeHelp LogoutSetup Chapter Configuration Using Web-based UtilitySetup Summary Device InformationSetup Network Settings Setup ZoomOrange The administrator has closed down this port Clicking on a port displays the Port Configuration screenSet Time Setup TimeLocal Time Daylight SavingPort Management Port Settings Setup Stack ManagementPort Management Sntp ServersPort Management Port Settings Port Configuration Port Management Link Aggregation LAG ConfigurationPort Management Lacp Port Management PoE Power SettingsVlan Management Vlan Management Port SettingVlan Management Create Vlan Vlan TableVlan Management Port to Vlan Vlan Management Vlan to PortJoin Vlan to Port Statistics Statistics Rmon StatisticsStatistics Rmon History Rmon History Log TableRmon History Table Statistics Rmon Alarms Add AlarmAlarm Table Statistics Rmon Events Statistics Port UtilizationStatistics Interface Statistics Security Security 802.1x SettingsEthernet-like ParametersSecurity Port Security Setting TimerSecurity Storm Control Security Management Access ListQoS Security RadiusBroadcast Only Counts only Broadcast traffic QoS Queue Settings QoS CoS SettingsCoS Settings CoS DefaultQoS Dscp Settings QoS Basic ModeQoS Bandwidth Spanning Tree Global SettingSpanning Tree STP Status Spanning Tree Global STPSpanning Tree STP Port Settings Bridge SettingsSpeed Displays the speed at which the port is operating Multicast Vlan Igmp SettingsMulticast Igmp Snooping Multicast Bridge MulticastSnmp Global Parameters Multicast Bridge Multicast Forward AllSnmp Group Profile Snmp ViewsSnmp Group Membership Snmp CommunitiesUser Name Provides a user-defined local user list Snmp Notification Recipient Snmp Notification FilterBase Table Advanced TableAdmin User Authentication AdminUser Authentication Local User EditAdmin Static Address Admin Dynamic AddressSecure The entry is defined for locked ports Admin Cable Test Admin Port MirroringQuery Clear Table If selected, this clears the MAC Address tableAdmin Save Configuration Admin Firmware Upgrade Admin RebootAdmin Factory Default Admin Logging Admin Server LogsAdmin 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 AllocationStack Units Startup Process Master DiscoveryMaster 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 Appendix C GlossaryGlossary Glossary Mail protocol on the Internet Packet a unit of data sent over a networkAppendix C Appendix D Specifications SpecificationsAppendix D Power in compliance with Ieee Class of Service Port-based 802.1p Vlan priority-basedDimensions Management VlanObtaining Warranty Service Warranty InformationAppendix E Exclusions and LimitationsTechnical Support Warranty InformationRegulatory Information Appendix FRegulatory Information Appendix F Norsk Norwegian Miljøinformasjon for kunder i EU Appendix F Contact Information Appendix G
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