NETGEAR GS748TNA, GS748TS-100NAS user manual V2.0, April

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GS748T Software User Manual

The GS748T switch supports Rapid Spanning Tree Protocol (defined by IEEE 802.1w), which is an improvement (over the 802.1D STP) that shortens connection latency between nodes. The resultant path between nodes determined by RSTP is the same as that eventually determined by STP. The following concepts are associated with this protocol.

Fast Link: When a port running the standard Spanning Tree Protocol (STP) is connected, it will go through the STP negotiation (listening -learning forwarding or blocking) before it is fully available. If a server is trying to access a client through the switch running the STP negotiation, it is not able to connect to it immediately. This can be a problem for some networks. Fastlink mode solves this problem by setting the port directly to forwarding mode, thus allowing any server access request to be forwarded. Fastlink mode can cause temporary loops in your network, but the STP eliminates them. Fastlink is best used on end node ports, i.e. ports connected to PCs or servers, to avoid network loops.

Bridge Priority: Priority setting of this switch in the Spanning Tree.

Bridge Max Age: Amount of time before a configuration message is discarded by the system.

Bridge Hello Time: Interval between configuration messages sent by the Spanning Tree algorithm.

Bridge Forward Delay: Amount of time system spends in 'learning' and 'listening' states.

Path Cost: The switch uses this to determine which port is the forwarding port. All other factors being equal, the path with the lowest cost to the root bridge is the active path.

Path Priority: STP bases on this to determine the port to use for forwarding. The port with the lowest number has the highest priority.

The IEE 802.1W RSTP Setting page of the GS748T switch contains a set of default values which are optimal for most applications. Adjust these values if you must provide for special conditions.

4-16

Configuring the Switch

v2.0, April 2007

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Contents NETGEAR, Inc Certificate of the Manufacturer/Importer TrademarksStatement of Conditions Bestätigung des Herstellers/ImporteursRegulatory Compliance Information Europe EU Declaration of ConformityFCC Requirements for Operation in the United States FCC Information to UserGS748T Smart Switch Product and Publication Details Contents Appendix a Specifications and Default Values Appendix C Network Cabling V2.0, April Who Should Use this Book How to Use This BookAbout This Manual Conventions, Formats and Scope BoldHow to Print this Manual Html Manual NavigationRevision History Document Date Version Description Part NumberChapter Switch Management Overview Switch Management InterfaceSwitch Management Methods System RequirementsGetting Started-Smart Wizard Discovery Network with Dhcp serverNetwork without Dhcp Server Manually Assigning Network Parameters V2.0, April Additional Utilities Web AccessPassword Change Firmware Upgrade Exit V2.0, April Chapter Basic Web Management Starting Web ManagementNetgear Home Page and Switch Status V2.0, April Description of Switch Status Parameters V2.0, April System Functions Managing System Files-Backup and Restore Firmware MenuTo back up files Factory ResetTo restore saved settings Resetting the System LogoutV2.0, April Chapter Configuring the Switch Using the Switch Configuration UtilityPort Configuration Viewing Packet Statistics V2.0, April Ieee 802.1p-based QoS Regulating Traffic Rates using Quality of Service SettingsPort-based QoS Differentiated Services Code Point DSCP-based QoS Vlan Adding and Configuring Ieee 802.1Q Vlan Groups Reconfiguring an Ieee 802.1Q Vlan Group Adding and Configuring Port-based VLANs Reconfiguring a Port-based VlanCreating Port Trunks to Increase Link Bandwidth Selecting a Management VlanSetting up Port Trunks Using a Sniffer Port to Monitor Traffic Removing Port TrunksJumbo Frame Support Controlling Per-port Packet ThroughputUsing Spanning Tree Protocol to Prevent Path Loops Storm Control Dropping Traffic that is Flooding a PortV2.0, April V2.0, April Enabling Switch Management using Snmp Controlling Switch Access by MAC Address and Vlan ID To Add a MAC AddressTo Remove a MAC Address from the Table Using Igmp Snooping to Route Packets Based on ContentFiltering Unknown Multicast Packets Setting Up Static Multicast Groups V2.0, April Appendix a Specifications and Default Values GS748T Smart Switch SpecificationsGS748T Smart Switch Features and Defaults Table A-3. Port CharacteristicsTable A-8. Other Features Smart Wizard Enabled Statistics Per port Appendix B Virtual Local Area Networks VLANs Ieee 802.1Q VLANs ExamplePort-based Vlan Example Configuration Port-based VLANsResults of this Configuration Category 5 Cable Appendix C Network CablingFast Ethernet Cable Guidelines Category 5 Cable Specifications Twisted Pair CablesPatch Panels and Cables Figure C-1Straight-Through Twisted-Pair CableUsing 1000BASE-T Gigabit Ethernet over Category 5 Cable CablingReturn Loss Near End Cross Talk NextLength RJ-45 Plug and RJ-45 Connectors Patch CablesConclusion V2.0, April