Asante Technologies 3500 Series user manual Port Vlan ID, How It Works, Spanning Tree Parameters

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7.1.3 Port VLAN ID

To allow untagged packets to participate in a VLAN, a Port VLAN ID (PVID) must be assigned in the relevant port(s).

Each port on the switch has a default PVID of 1 (the default VLAN) and will receive both tagged and untagged frames. You may configure the PVID of any desired port (the range is 1 to 4094). For ports that have been configured to receive only tagged frames, the PVID is meaningless. If a port is configured to receive only tagged frames, then any untagged frame received will be dropped. Tagged frames that are received will be forwarded to the VLAN represented by the VID in the tag header of the frame.

See Appendix B. VLAN Description and Examples for more information, or visit http://www.ieee.org.

7.2 Spanning Tree Protocol

The Spanning Tree Protocol (STP) is part of the IEEE 802.1D standard. It provides for a redundant network without the redundant traffic through closed paths. For example, in a network without spanning tree protocol, the same message will be broadcast through multiple paths, which may start an unending packet-passing cycle. This in turn causes a great amount of extra network traffic, leading to network downtime. The STP reduces a network like this, with multiple, redundant connections, to one in which all points are connected, but where there is only one path between any two points (the connections span the entire network, and the paths are branched, like a tree).

7.2.1 How It Works

All of the bridges (a switch is a complex bridge) on the network communicate with each other using special packets of data called Bridge Protocol Data Units (BPDUs). The information exchanged in the BPDUs allows the bridges on the network to do the following:

•Elect a single bridge to be the root bridge

•Calculate the shortest path from each bridge to the root bridge

•Select a designated bridge on each segment, which lies closest to the root and forwards all traffic to it

•Select a port on each bridge to forward traffic to the root

•Select the ports on each bridge that forward traffic, and place the redundant ports in blocking states

7.2.2 Spanning Tree Parameters

The operation of the spanning tree algorithm is governed by several parameters. You should attempt to set these parameters only if you have experience with the 802.1D specification. To set the parameters listed below, access the Spanning Tree/Bridge Settings screen (console or telnet), or the Spanning Tree/Bridge Settings page (in the web interface).

Bridge Priority

Setting the Bridge Priority to a low value will increase the likelihood that the current bridge will become the root bridge. If the current bridge is located physically near the center of your network, you may wish to decrease the Bridge Priority from its default value of 32768 to make it become the root bridge. If the current bridge is near the edge of your network, it is best to leave the value of the Bridge Priority at its default setting.

Hello Time

This is the time period between BPDUs transmitted by each bridge. The default setting is 2 seconds.

Maximum Age

Each bridge should receive regular configuration BPDUs from the direction of the root bridge. If the maximum age timer expires before the bridge receives another BPDU, it assumes that a change in the topology has occurred, and it begins recalculating the spanning tree. The default setting for Maximum Age is 20 seconds.

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Contents IntraCore 3500 Series Quick Start Guide Gigabit Ethernet Switches User’s Manual IntraCore 3500 SeriesTable of Contents Page Package Contents IntroductionLEDs 1 IC3524 Models2 IC3548-2GT 4810/100Front and Back Panel Descriptions #49Management and Configuration Snmp Management Console InterfaceWeb-Based Interface Safety Overview Hardware Installation and SetupInstallation Overview Power Requirements Installation into an Equipment RackRecommended Installation Tools Environmental RequirementsEquipment Rack Guidelines Installing a GbicGbic Interfaces Removing a Gbic Installing Optional Hardware ModulesConnecting Power Gbic Care and HandlingConnecting to the Network 1 10/100BaseT Ports Cabling ProceduresConnecting to a Console SetupGigabit Ethernet Ports Cabling Procedures Connecting Via Telnet Changing the PasswordConnecting Via the Web Browser IP Assignment Snmp ManagementUsing the Stacking Feature IC3524 only Toggle Stacking Enable/Disable Logging ConfigurationAccessing a Submenu Exiting a Submenu Configuration MenuGeneral Information System Administration Configuration Changing System Administration InfoChanging System IP Information System IP ConfigurationBootstrap Configuration Snmp Configuration Changing Community StringsDeleting a Trap Receiver Enabling Authentication TrapsAdding or Updating a Trap Receiver Port Configuration Basic Port Configuration Menu appearsConfiguring Auto-Negotiation Enabling or Disabling a PortToggling Port Link Speed Configuring a Port ManuallyConfiguring 1000BaseX Ports Toggling Half to Full DuplexEnabling or Disabling 802.3x Flow Control Advanced Port ConfigurationSetting Port Class of Service Setting Port Default Priority Global Port ConfigurationUnicast Forwarding Database Configuration Displaying the Forwarding DatabaseSetting the MAC Address Age-Out Time Searching for a MAC AddressVlan Management Port Mirroring ConfigurationSecurity Management IP Multicast Traffic ManagementImage Downloading through Tftp File Up/Downloading ConfigurationSetting the Monitor Port Serial Downloading Configuration Performing a Software Upgrade at RuntimePerforming a Software Upgrade System Reset ConfigurationResetting the Switch Scheduling a System Reset System LogUser Interface Configuration Clearing the System LogSetting Console Idle Time-out Period Setting Telnet Idle Time-out PeriodEnabling or Disabling the Web Server Changing the PasswordSystem Utility Viewing Statistics Spanning Tree Protocol Configuring Spanning Tree ParametersAdvanced Management Enabling and Disabling STPSpanning Tree Port Configuration Setting Port Priority and Path CostRmon Management Snmp and Rmon ManagementDuplicated IP Detection and Trap Enabling and Disabling Duplicated IP Trap Enabling and Disabling Station Movement TrapEnabling and Disabling Duplicated IP Detection Viewing a List of Duplicated IP AddressesConfiguring Port Security Configuring Port New Node Detection TrapSetting the Intruder Trap Configuring Port Lock and Intruder LockConfiguring Security Level 2 or Level Other Vlan Features of the switch Vlan Specifications for the IntraCore 3500 SeriesResetting Security to Defaults Inserting/Modifying a Port Trusted MAC AddressConfiguring Static Vlan Groups Kkxxxxxx KxxxxxxxAdvanced Static Vlan Configuration Specifying Tagging or No Tagging for a Port Configuring Vlan Port AttributesSetting the Port Vlan ID Displaying a Vlan Port Summary Configuring Port Receive Frame TypeDisplaying a Summary of Vlan Groups Adding and Deleting VLANs from the PortResetting Vlan Configuration to Defaults Multicast AddressesEnabling and Disabling Igmp Snooping Configuring IP Multicast Traffic ManagementIgmp Snooping Displaying a Summary of Group AddressesInserting a Multicast Group Address IP Multicast Forwarding Database ConfigurationAdding Ports to the Selected Address Removing a Multicast Group Address To remove an addressAccessing with a Web Browser Web-Based ManagementFront Panel Button Genl Info General Information ButtonStatistics Button Port Config Port Configuration Button Span Tree Spanning Tree Button Snmp Button Addr Address Table ButtonVlan Button Port Configuration Adding and Deleting Port Members Vlan ConfigurationCreating or Modifying a Vlan Page Security Button Duplicate IP Button Snmp Protocol Snmp ManagementSnmp Management Operations Name Space Path Community Name and SecurityMIB Tree MIB Groups SupportedPage Port-Based VLANs Switching ConceptsVLANs Vlan ID and Tagged FramesSpanning Tree Parameters Port Vlan IDHow It Works Full Duplex Forward DelayFull Duplex, Flow Control and Auto-negotiation Port PriorityFlow Control Auto-NegotiationAppendix A. Troubleshooting Problem Possible SolutionsSpecifications Appendix B. Features and SpecificationsFeatures Environmental Range Physical CharacteristicsTechnical Support and Warranty Standards ComplianceIntraCare Warranty Statement Appendix C. FCC Compliance and Warranty StatementsFCC Compliance Statement Important Safety Instructions Page Pin Number Signal Name Appendix D. Console Port Pin OutsAppendix E. Online Warranty Registration Image Banks Appendix F. BootP ConfigurationBootstrap Configuration Loading Software Locally
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