Allied Telesis 2.6.1 manual Interfaces to Layer 3 Protocols, Igmp Snooping

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Layer 2 Switching		97
	Table 20: Parameters in the output of the SHOW STP COUNTER command

	Parameter	Meaning

	Config BPDU length	The number of Configuration BPDUs that had an incorrect
		length.

	TCN BPDU length	The number of Topology Change Notification BPDUs that
		had an incorrect length.

	RST BPDU length	The number of Rapid Spanning Tree BPDUs that had an
		incorrect length (RAPID mode only).

If necessary, all the STP configuration that users have created on the switch can be removed, so that all STPs except the default STP are destroyed, and all other defaults are restored, using the command:

PURGE STP

The PURGE STP command should be used with caution, and generally only before major reconfiguration of the switch, as it removes all STP configuration entered on the switch.

Interfaces to Layer 3 Protocols

Interfaces can be configured to VLANs for IP, IPX and Appletalk routing protocols in the same way that other interfaces are created for other interface types. Concatenate VLAN with the VID of the VLAN giving VLANn, for instance:

INTERFACE=VLAN3

IGMP Snooping

IGMP (Internet Group Management Protocol) is used by IP hosts to report their multicast group memberships to routers and switches. IP hosts join a multicast group to receive broadcast messages directed to the multicast group address. IGMP is an IP-based protocol and uses IP addresses to identify both the multicast groups and the host members. For a VLAN-aware devices, this means multicast group membership is on a per-VLAN basis. If at least one port in the VLAN is a member of a multicast group, by default multicast packets will be flooded onto all ports in the VLAN.

IGMP snooping enables the switch to forward multicast traffic intelligently on the switch. The switch listens to IGMP membership reports, queries and leave messages to identify the switch ports that are members of multicast groups.

Multicast traffic will only be forwarded to ports identified as members of the specific multicast group.

IGMP snooping is performed at Layer 2 on VLAN interfaces automatically. By default, the switch will only forward traffic out those ports with multicast listeners, therefore it will not act as a simple hub and flood all multicast traffic

Software Release 2.6.1 C613-02039-00 REV A

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Contents AT-8800 Series Switch Page Contents AT-8800 Series Switch User Guide Operating the switchMaintenance and Troubleshooting Page Why Read this User Guide? Introducing the AT-8800 Series SwitchChapter AT-8800 Series Switch Documentation Set Where To Find More InformationOnline Technical Support Features of the AT-8800 Series SwitchIntroduction Software Features Management FeaturesSpecial Feature Licences Do if You Clear Flash Memory Completely on This Chapter Getting Started with the Command Line Interface CLITerminal Communication Parameters Connecting a Terminal or PCParameters for terminal communication Value Getting Started with the Command Line Interface CLI Enter the password at the password promptLogging Assigning an IP AddressTo change the IP address for an interface, enter the command Setting RoutesChoosing a Password Changing a PasswordTo add a static route, enter the command Not available Using the CommandsTo display the current help file, enter the command Getting Command Line HelpAliases Setting System Parameters Enabling Special Feature LicencesGetting Started with the Graphical User Interface GUI Getting Started with the Graphical User Interface GUIAccessing the Switch via the GUI What is the GUI?Browser and PC Setup Supported browsers and operating systemsHttp Proxy Servers See Option 3 Connecting to an Installed Switch on Establishing a Connection to the SwitchSee Option 1 Configuring the Switch before Installation on See Option 2 Installing the Switch into the LAN onUse this procedure if Option 1 Configuring the Switch before InstallationSee Http Proxy Servers on page 23 for more information Default username is manager Option 2 Installing the Switch into the LANAt the login prompt, enter the user name and password Plug the switch into the LANAssign the vlan1 interface an IP address See Secure Access on page 29 for more informationFind out the IP address of the switch’s interface Option 3 Connecting to an Installed SwitchSelect a PC If necessary, bypass the Http proxy serverCreate a Security Officer user account Secure AccessTo enable system security, use the command Then enter the password for CIPHER, sbr4y3To create an RSA key pair, use the command System Status System StatusConfiguration Menu Using the GUI Navigation and FeaturesUsing Configuration Pages Quality of Service and traffic filtersAn example of a configuration page with a selection table Editable Fields Monitoring Menu Management MenuChanging the Password Diagnostics MenuContext Sensitive GUI Help Combining GUI and CLI Configuration Saving Configuration Entered with the GUIConfiguring Multiple Devices Then delete the GUI resource file, using the command To upgrade the GUILoad the new file onto the switch Upgrading the GUIInstall the new file as the preferred GUI TroubleshootingPoint your web browser at the switch’s IP address Deleting Temporary Files Accessing the Switch via the GUITraffic Flow Solutions SolutionIP Addresses and Dhcp Time and NTPLoading Software Page User Accounts and Privileges Using Scripts onSnmp and MIBs on A Security Officer prompt looks likeLogin To display the current operating mode, enter the command Normal Mode and Security ModeOperating the switch Specific Parameters Storing Files in Flash Memory Remote ManagementExample output from the Show File command Using ScriptsStoring Multiple Scripts Saving the Switch’s ConfigurationFile Naming Conventions Loading and Uploading FilesFile extensions and file types Extension File type/function SPA Loading FilesExample Load a Patch File Using Http Setting Loader DefaultsTo load a patch file Configure the Loader Download the patch fileExample Upload a Configuration File Using Tftp Uploading Files From the SwitchMore information To upload a log fileUpgrading Switch Software To upgrade to a new software release Example Upgrade to a New Software Release UsingLoad the new release file onto the switch Make the release the default permanent release Enter the licence password for the software releaseEnter licence information for the release Test the releaseTo upgrade to a new patch file Example Upgrade to a new patch fileCheck that the file is successfully loaded Snmp and MIBs Using the Built-in EditorFor More About Operations and Facilities Where interface is the name of an interface, such as vlan11AT-8800 Series Switch User Guide Enabling and Disabling Switch Ports Switch PortsTo display information about switch ports, use the command To enable or disable a switch port, use the commandsSTP Autonegotiation of Port Speed and Duplex Mode Speed 10/100 Port TrunkingShow VLAN=ALL Packet Storm Protection Layer 2 SwitchingPort Mirroring Port security Virtual Local Area Networks VLANs Example output from the Show Switch Port Intrusion commandTpid Vlan TaggingFormat of user priority and Vlan data in an Ethernet frame Vlan Membership using Vlan Tags Vlan Membership of Untagged Packets Vlan membership of example of a network using tagged portsMember ports Vlans with untagged ports Creating VLANsTo destroy a VLAN, use the command To add tagged ports to a VLAN, use the commandProtected VLANs Summary of Vlan tagging rulesVlan Interaction with STPs and Trunk Groups Generic Vlan Registration Protocol Gvrp Layer 2 Switching ProcessIngress Rules Learning Process Forwarding Process Layer 2 Filtering Example output from the Show Switch Filter command Egress Rules Quality of ServiceSpanning Tree Modes Spanning Tree Protocol STPSpanning tree port states State Meaning Spanning Tree and Rapid Spanning Tree Port StatesRapid Spanning Tree port states State Meaning Configuring STP SET STP=stpnameALL PRIORITY=0..65535 Example output from the Show STP command Do not occur Parameter Meaning Switch Max AgeTo display STP port information, use the command Example output from the Show STP Port command 94AT-8800 Series Switch User GuideTo show STP counters, use the command Receive 96AT-8800 Series Switch User GuideTransmit DiscardedIgmp Snooping Interfaces to Layer 3 ProtocolsDisable Igmpsnooping Group List Example output from the Show IP Igmp commandEvent TriggersDescription ParametersLayer Displays the interfaces enabled for IP routing Figure Then use either of the following commandsInternet Protocol IP IP MulticastingNovell IPX Routing Information Protocol RIPLayer 103 AppleTalk Example output from the Show IPX Circuit commandLayer 105 Resource Reservation Protocol RsvpPage Maintenance and Troubleshooting Switch startup messages How the Switch Starts UpSet system territory How to Avoid ProblemsWatch for software updates If you accidentally do this, you will need to What to Do if You Clear Flash Memory CompletelyWhat to Do if the PPP Link Disconnects Regularly What to Do if Passwords are LostGetting the Most Out of Technical Support Checking Connections Using Ping Resetting Switch DefaultsTo get debugging output, enter the command Maintenance and Troubleshooting 113To set Ping defaults, enter the command Troubleshooting IP ConfigurationsStop a Ping that is in progress, enter the command Telnet FailsYour switch is acting as a Dhcp client Troubleshooting Dhcp IP AddressesYour switch is acting as a Dhcp server Maintenance and Troubleshooting 115To check that the PPP link is active, enter the command Troubleshooting IPX ConfigurationsLocal Workstations Can Not Access Remote Servers No Routes are Visible to the Remote RouterCheck route tables Using Trace Route for IP TrafficTo halt a trace route that is in progress, enter the command