Fujitsu BX620, PG-FCS103, PG-FCS102 manual Topology Change Notice TCN, 144

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4.8.4Topology Change Notice (TCN)

A bridge/switch creates a forwarding table of MAC addresses and port numbers by learning the source MAC address that received on a particular port. The table is used to forward frames to a specific port rather than flooding the frame to all ports. The typical maximum aging time of entries in the table is 5 minutes. Only when a host has been silent for 5 minutes would its entry be removed from the table. It is sometimes beneficial to reduce the aging time. For example, when a forwarding link goes to blocking and a different link goes from blocking to forwarding. This change could take up to 50 seconds. At the end of the STP re-calculation a new path would be available for communications between end stations. However, because the forwarding table would still have entries based on the old topology, communications may not be reestablished until after 5 minutes when the affected ports entries are removed from the table. Traffic would then be flooded to all ports and re-learned. In this case it is beneficial to reduce the aging time. This is the purpose of a topology change notice (TCN) BPDU. The TCN is sent from the affected bridge/switch to the root bridge/ switch. As soon as a bridge/switch detects a topology change (a link going down or a port going to forwarding) it sends a TCN to the root bridge via its root port. The root bridge then advertises a BPDU with a Topology Change to the entire network.This causes every bridge to reduce the MAC table aging time to 15 seconds for a specified amount of time. This allows the switch to re-learn the MAC addresses as soon as STP re-converges.

Topology Change Notice BPDUs are sent when a port that was forwarding changes to blocking or transitions to forwarding. A TCN BPDU does not initiate an STP recalculation. It only affects the aging time of the forwarding table entries in the switch.It will not change the topology of the network or create loops. End nodes such as servers or clients trigger a topology change when they power off and then power back on.

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Contents Before Reading This Manual 101Symbols Entering commands KeysSymbols Definition CD-ROM drive\Setup.exeProduct names Expressions and abbreviations Abbreviations103 104 Handling this productRecycle Contents 106 SpecificationsOverview Functional Description Functionality and FeaturesFeatures 108 TCP Offload Engine TOEBroadcom Advanced Control Suite 2 BACS2 Load Balancing and Fault Tolerance Teaming FunctionBroadcom Advanced Server Program Bsap Overview Types of TeamsSmart Load Balancing and Failover Link Aggregation 802.3adGeneric Trunking FEC/GEC/802.3ad-Draft Static 110SLB Auto-Fallback Disable Windows Server With SNPVirtual LAN Function LiveLinkTeaming and Large Send Offload/Checksum Offload Support Vlan OverviewComponent Description PC #5. Tagging is not enabled on PC #3 switch port Adding VLANs to Teams114 PC #3Installing a 1Gbit/s Ethernet I/O Module Installing in a Server Blade Installation Position of the 1Gbit/s Ethernet I/O ModuleInstallation Procedure for the 1Gbit/s Ethernet I/O Module 116Install the 1Gbit/s Ethernet I/O Module Install the server blade to the chassisRemove the top cover Secure the 1Gbit/s Ethernet I/O Module with the screwsClick Next Installing the Driver SoftwareInstalling the LAN Drivers Broadcom Gigabit Ethernet Overview Glossary120 Teaming Concepts Teaming and Network AddressesNetwork Addressing Teaming and Network AddressesTypes of Teams 122Broadcom Gigabit Ethernet Teaming Services Link Aggregation Ieee 802.3ad Lacp 124Software Components Generic TrunkingHardware Requirements 126Broadcom Teaming Software Component Software Broadcom Name Windows File Name ComponentConfiguring Teaming Supported Features by Team Type128 Yes Selecting a Team TypeProcess for Selecting a Team Type Teaming Mechanisms Architecture130 Intermediate DriverOutbound Traffic Flow Inbound Traffic Flow SLB OnlyOr the streams may look like this Protocol Support132 Performance Switch-IndependentTypes of Teams 134 Switch-DependentGeneric Static Trunking Dynamic Trunking Ieee 802.3ad Link Aggregation Outgoing packet management Feature Attribute136 Speeds Supported for Each Type of Team Type of Team Link Speed Traffic Direction Speed Support10/100/1000 Incoming/outgoing Mixed speed 100 Incoming/outgoing Same speedWake on LAN Preboot Execution environment PXE Teaming and Other Advanced Networking Properties138 Adapter Properties Supported by Teaming Virtual AdapterChecksum Offload Ieee 802.1p QoS TaggingLarge Send Offload Jumbo FramesTeaming Across Switches Switch-Link Fault TolerancePreboot Execution Environment General Network ConsiderationsARP Table Blue 100=49C9 SLB Team 102=5ECA8283 Red142 Spanning Tree Algorithm Topology Change Notice TCN 144Layer 3 Routing/Switching Teaming with Hubs for troubleshooting purposes onlyHub Usage in Teaming Network Configurations Port Fast/Edge PortSLB Teams SLB Team Connected to a Single HubGeneric and Dynamic Trunking FEC/GEC/IEEE 802.3ad Teaming with Microsoft NLB/WLBSTroubleshooting Teaming Problems Teaming Configuration TipsTroubleshooting Guidelines Frequently Asked Questions148 Question AnswerBe configured on the same server? Server Is restored fallback?It must be upgraded using the Setup installer Adapter150 Event Log Messages Windows System Event Log messagesBase Driver Physical Adapter/Miniport Message Cause Corrective Action Number152 Duplex settings Medium not supportedReboot the operating Intermediate Driver Virtual Adapter/Team Unspecified failure duringIntermediate Driver Event Log Messages Unable to register with Driver cannot Unload any NdisSupport the operating Release notes and install Successfully enabled a Only Interface154 System on which it isMessage Cause Corrective Action Number Third pane contains the Menu bar BACS2 Overview156 Types of Information Provided by BACS2 Function DetailsLicenses Only available with this product J5.4.8 Licensespg.175Installing the BACS2 158License agreement window appears Installer starts upFor Windows Server 2003 Custom Set up window appears 160CD-ROM drive \PROGRAMS\GENERAL\Broadcom\MgmtApps\setup.exe For Windows Server 2003, Windows 2000 ServerSetting of BACS2 Starting BACS2Vital Sign 162Network Status With headers appended to themBy the host CPU Following network status information is providedTeam Status 164Resources Following information can be checked on the Resources tabFunction number for the second port is Interrupt Request Range from 2 to Memory AddressFollowing information can be checked on the Hardware tab Hardware166 Not enable QoS. Otherwise, problems may occur AdvancedFollowing information can be checked on the Advanced tab 802.1p QOS168 Locally Administered Not Present defaultAdministered address include the following Sets the speed at 10 Mbit/s and the mode to Full-Duplex170 DiagnosticsNetwork Test Control Registers Identifying the adapter172 StatisticsGeneral Statistics Ieee 802.3 Statistics Command Length = MAC Rx w/ Pause CommandCustom Statistics 174Licenses Configuring Teaming 176On the BACS2 Tools menu, click Create a Team Using the Broadcom Teaming WizardCreating and Modifying a Team Using the Teaming Wizard 178 Broadcom Advanced Control Suite 2 BACS2 Select the standby member from the list of adapters Broadcom Advanced Control Suite 2 BACS2 Type the Vlan name and then click Next 182 To tag the VLAN, click Tagged and then click Next Type the Vlan tag value and then click Next Click Yes to add another Vlan and then click Next184 Value must be between 1Click Finish to commit the changes Using Expert Mode To work without the wizard, click Expert ModeCreating a Team Click the BACS2 Tools menu → Create a TeamBroadcom Advanced Control Suite 2 BACS2 188 Configure the team IP addressModifying a Team Wizard Welcome screen appears Following shows how to modify a teamAdding a Vlan Viewing Vlan Properties and Running Vlan Tests Type the Vlan ID and Vlan name, and click ApplyClick Remove Vlan Click Apply Click the Tools menu → Configure a TeamDeleting a Vlan Following shows how to configure a LiveLink 192Configuring LiveLink in VLAN-tagged Environments Repeat for each of the other listed team members Click ApplySaving and Restoring a Configuration Following shows how to save a configurationFollowing shows how to restore a configuration Viewing the Team Properties and StatisticsAppendix a Contact 196 Primergy