LES Specific Information Command Actions | 3Com 9000 specs

278CHAPTER 9: MANAGING LAN EMULATION

Display Redundant Display specific information on a redundant LES.

LES Specific

Information

Command Actions

Enter menu sequence:				(2) LEM: LAN Emulation
				(1) LCS: LE Configuration Service
				(5) LNT: LECS Network topology
				(9) RDN: LE Service redundancy
				(7) RLS: Display Redundant LES
					specific info.
Enter a parameter at the prompt
	Parameter			Format or Range
	Redundant LES id			The internal LES id number. (For more information, see
				““Display Redundant LES General Information” on
				page 277.)
Direct access sequence:				2 1 5 9 7 [parameter]
Command Result
System action taken:				The specific redundant LES information is displayed.
System message display: Information is displayed as shown in the example.
Example
Enter: 2 1 5		9	7 0
The following information is displayed:

	LES ATM Address			:
	4700000000003c0000a000000000c0da7f920901
	Connection State			: ESTABLISH
	LES Location			: INTERNAL
	Local LES instance: 1
	Number of Active Clients				: 1
	Time since Last Active msg (Sec)				: 6
	Number of RESET messages sent to LES: 0
	Number of RESET messages rcvd by LES: 0
	Reset LES Allowed: 1
	Number of ELANs attached to LES				: 1

Image 278

3Com 9000 manual LES Specific Information Command Actions, Enter 2 1 Following information is displayed

Contents

CoreBuilder ATM Enterprise Switch Management Guide 3Com Corporation 5400 Bayfront Plaza Santa Clara, California Contents Management Capabilities Starting Up LMA Access Level Logging Logging Out Reset Switch Set Management Configuration to Factory DefaultsReset All 103 Display Software Versions 104 116 Update Auto-discovery status 117122 Update Ilmi Channel Polling Interval 123 105 136 Network Prefix Display Network Prefix 134Get ATM Addresses at Port 135 148 192 ATM-Layer Statistics 193 189190 198 AAL5-Layer Statistics 199 222 Update Startup Delay 223 Lane Version of Switch 224218 229 252 Display Elan MAC Addresses 254 289 Update Elan Response Policy 291Reset LES Configurations 298 255 Add Elan MAC Address 256 Display Elan ATM Addresses 257 306 Display LAN Emulation Statistics Update LEC Elan Join Privilege for Current SessionConfiguring Pnni Nodes 333 Get Number of Nodes 334 308 346 Get Peer Group ID 344 Set Default ATM Address 345343 358 407 Display Ptse Node Information 412 389394 414 Display Summary Address Table 416 ATM Switch Fabric Module Specifications Physical Menu Index Technical Support About this Guide Text Conventions ConventionsList conventions that are used throughout this guide Icon Description Conventions Parameter Format or Range Command ActionsCommand Result Key Section Description Explains the command descriptionsCommand Description Sections CoreBuilder 9000 Documentation Overview Paper Documents Module Quick Start Guides or Getting Started Guides Documents on CD-ROM An ATM network Year Compliance About this Guide ATM Switch Fabric Module The ATM Interface Module CoreBuilder ATM Enterprise Switch CharacteristicsCoreBuilder 9000 ATM Enterprise Switch has two components ATM Interfaces Module Type No. of Ports Rate Mbps Card Type 3Com Part Number Mechanisms for Preventing Congestion Preventing congestion Handling congestion Virtual Networks Mechanisms for Handling CongestionClassical IP Clip ATM Call Admission CLP-based Cell Discard Key Features Software Release Supported StandardsProtocols Overview Starting UP Handling Précautions de Sécurité Poignées d’insertion/d’éjection sont ouvertes Switch Fabric ATMManipulation Vorkehrungen beim Umgang mit dem Modul Installation CoreBuilder 9000 Enterprise Switch CoreBuilder Switch IntegratedFast Setup Setup Section Description Integrated Fast Setup Procedure SectionsIntegrated Fast Setup Procedure Navigation Aids Sections Starting Up ManagementCapabilities Access Levels Access Level Privileges LMA Main Menu LMA Menu System LMA Menu Structure Entering the Menu Sequence At the Platform Configuration Menu prompt, enterAt the Switch Setup Menu prompt, enter Password again exactly as before Entering the Command ParametersPassword in a format of up to eight alphanumeric characters Command Results To go Type or Press Menu Navigation FunctionsEditing Aids To perform this task Type or Press Automatic Logout Configuring the Platform Update Admin-access Password Set Password to Factory Default Read-access password is updated Example Write-access password is updated Before you enter the new password Admin-access password is updated Enter y to confirm. The following message appears Passwords are reset to their factory valuesEnter 1 1 1 Following prompt is displayed Setting Up for Following message is displayed Current IP address is displayed Next reboot MNG Management setupSIP IP Setup SIP Set IP Address Current NMS IP address is displayed Example Enter 1 1 NMS address is updated toNMS NMS Setup SNS Set NMS Address Current default gateway IP address is displayed Address found in the local IP subnetwork Default Gateway address was GWY Default Gateway SetupSGW Set Default Gateway Successfully set for the next reboot Current IP subnet mask configuration is displayed Address SSM Set Subnet Mask MSK Subnet Mask SetupSet for the next reboot Subnet Mask address was successfully Current read community string is displayed Enterprise SwitchCommunity String Update Read Update the Read Community String of the CoreBuilder 9000 ATM ATM Enterprise Switch Current write community string is displayed Update Write Current Ethernet Type configuration is displayed Eth Type was successfully set for ETH Ethernet Type SetupSET Set Ethernet Type Enter 1 1 2 Following prompt is displayed RebootManagement Configuration is set to the factory defaults Setting the Port Network Connection Type Command Actions UNI Port 1 7.1.2 7.1.3 7.1.4 7.2.1 7.2.2 7.2.3 Network connection type for port 3.1.2 is updated to UNI Enter y to confirm. The following message is displayed Enter 1 1 3 Following prompt is displayed NNI configuration parameters are reset to UNI for all portsUNI for all ports, and 7 for maximum number of hops Parameters Resetting AllCoreBuilder 9000 ATM Enterprise Switch Enter 1 2 Following messages are displayed Parameters Enter 1 Following message is displayed System Software Download Status Command ActionsDownloading Display Software Download Messages Message Meaning and Action Download procedure Enter 1 3 Following prompts are displayed Load Mode Description Load Modes Configuration is uploaded to the host Host Enter 1 3 Following message is displayed Module Status Managing SwitchFabric Modules Name Description Switch Fabric Module ParametersSwitch Fabric Module Parameters Switch is rebooted and the following messages are displayed Enter 1 4 Following prompt is displayed Enter 1 4 3 Following prompt is displayed Reset Standby Switch Reset the standby switch fabric moduleFabric Module Command Actions Mode Command Actions Direct access sequence 1 4 3 3 Display Interface ConfiguringInterface Modules Module Information Slot ID Parameters Interface Module Slot Occupancy ParametersExample for the 16-slot chassis and 7-slot chassis Parameter Description Interface Card Parameters Interface Parameters OC3-SC Enter 1 5 3 5.1.1 Following messages are displayed Selected ports are set and saved Clock operational mode of port 1.1.2 is set to loop timing Enter 1 5 4 1.1.2 Following message is displayed Loop mode of port 1.1.2 is set to Loop back Enter 1 5 5 1.1.2 Following messages are displayed Enter 1 5 6 Following prompt is displayed RST Reset Interface CardInterface card was reset IFC Interface Cards Logging Out and Rebooting Enter System is logged out Reboots the ATM Enterprise Switch Reboot Reboot the system Command ActionsParameter Format or Range Confirm reboot Enter 1 Following prompt is displayed Direct access sequence 1 Software Versions ATM FeaturesDisplay ATM Features Latest software version numbers Display Lecs ATM Address Update Lecs ATM Address SLA Set Active Lecs ATM Addr SLE LE SetupLCS Lecs Setup Active Lecs addraddress Get Clock Source Setting UpSwitch Clock Source Status Source Cannot be used as an external clock source port SP2 Set External Clock Source Internal Command Actions Enter 1 8 Following prompt is displayed Ilmi Setup GET Get Ilmi Version IME Ilmi SetupVER Ilmi Version Setup Ilmi version is 3.0/3.1/4.0 Example Enter Ilmi version of port 3.1.2 is updated toIlmi version is reconfigured SET Set & Save Ilmi Version Enter 1 1 8 2 1 Auto-configuration status of port 3.1.2 is enabled AUD Auto-Discovery Setup SET Set & Save Auto-Discovery GET Get Lecs via Ilmi MIB Ilmi MIB View SetupLecs via Ilmi is ENABLED/DISABLED ON/OFF Status LECS-via-ILMI status of port 3.1.2 is enabled Enter 1 1 8 4 1 8 4 VPI/VCI = 0/16 is periodically polled for connectivity Enter 1 1 8 4 4 3.1.2 Addresses at Port ATM Addresses PortDisplay User Enter the menu sequence 3 CON Connections Enter 3 1 1 UME Parameters Describes the UME parameters displayed by the commandUME Parameters STC Get Static and NNI Addresses CON ConnectionsADD Get ATM Addresses At Port Describes the parameters displayed by the command Parameters Port Command Actions Parameters Enter 3 4 2 1 Addresses C Setup of Connections and ATMSTP Static ATM Addresses Setup ADD Add ATM Address Port DEL Delete ATM AddressATM address member n was deleted from Enter 3 4 2 4 Enter 3 4 2 Following prompt is displayed Prefix Network PrefixDisplay Network Managing Network Interfaces Configuring Virtual Channels Signaling Setup Signaling Timers Configuring Virtual Channels RTG Routing CLL Calls Example Display all SVC Calls for an ATM address member Example Display Info for a Specific SVC Call With two additional destinations Example Display all PVC Calls for a PortTwo additional destinations Call Parameters Shows the call parameters displayed by the commandCall Parameters Display Port Connections Example Display all Connections at a Port Port SVC Connection Parameters Example Display Info for a Connection at a PortPort SVC Connection Parameters PRT ATM ports Port Static Connection Parameters Port Static Connection Parameters Connections Command Actions Create Permanent Virtual Channel PVC Enter 3 4 1 Following information is displayed Create Permanent Virtual Channel PVC Direct access sequence 3 4 1 2 parameters Full PVC Call Parameters Enter 3 4 1 3 p2p 5.1.1 0 37 5.1.2 0 You cannot add an additional PVC destination to a P2P PVC You cannot release SVCs with this menu Parameter Example Enter 3 4 PVC PVCs Setup GEP Display PVCs All inactive PVCs are deleted from the flash memory Enter y to confirm, n to cancel Following message appearsFollowing prompt appears Connections of Port Command Actions All PVCs of the specific port are deleted NNI Hops NNI Hops SetupDisplay Maximum Maximum NNI Hops parameter is updated to Signaling Setup GET Get VPI/VCI range SIG Signaling SetupVCC VPI/VCI range setup Following information is displayed for an OC-3c port Following information is displayed for an OC-12c port Information, see Display VPI/VCI Range on Maximum VPI for port 3.1.2 is updated to Protocol Profile Enter 1 1 4 5 Enter 1 1 4 5 2 3.1.2 Following information is displayed Protocol Version Parameters Protocol Version Parameters Enter 1 1 4 5 4 3.1.2 Display Call-Proceeding Enable Value Display the value of the call-proceeding enable value Enable Value Command Actions Enter 1 1 Following message appears Enter Y to confirm, N to cancel Enter 1 1 4 Following prompt appears Response is overdue Protocol timersHalf. For more information, see Timer Resolution on page 98 Enter 1 1 4 1 SET Set Timer Resolution Timer resolution is updated to 250 msec and saved to flashRES Timer Resolution setup Timer resolution was successfully set Displayed in seconds Parameter Format or Range Port number Slot.group.port4 2 parameters Enter 1 1 4 2 Sscop Timers Sscop TimersShows the Sscop Timers displayed by the command QSA Get Signaling Qsaal Sscop Configuration Parameters Sscop Configuration Parameters Enter 1 1 4 4 Configuring Virtual Channels Physical Layer Statistics Enter 4 1 1 Physical Layer Statistics Statistic Statistics Command Actions Physical statistics are reset for port Reset Counters Per Port Reset Counters Per VPI/VCI ATM-Layer Statistics Enter 4 2 Following information is displayed Example Enter 4 2 Following information is displayed Enter 4 2 3 1.1.1 3 Reset ATM counters completed ATM Counters for the specified port are reset toRPR Reset counters per port ATM ATM layer Counters are reset Perform menu item 3CON\2RTG\1CLL to You can display the following AAL5-layer statistics Display AAL-Layer Statistics Reset AAL-Layer StatisticsAAL5-Layer Statistics Enter 4 3 Following information is displayed SAR Counters Enter 4 3 Following message is displayed AAL5 Control Frame Port Statistics You can display the following AAL5 control statistics Enter 4 4 1 Port Statistics Command Actions AAL5-layer control statistics are reset for port Signaling Protocol Statistics You can display the following signaling statistics Enter 4 5 1 Counters Command Actions Signaling statistics are reset for port Viewing Statistics Learp Policy Configuration LEC Operations Managing LAN Emulation Services Setup LAN Emulation Status Command Actions 5 1 LE service status will be Disabled on the next reboot Direct access sequence 1 1 5 2 Lecs service status is set for the next reboot Lecs is disabled LAN Emulation Redundancy Setup Enter 1 1 5 3 LOL Lecs ordered list SYS Platform configLecs is entered into the LECS-order database AOL Add to Lecs ordered list Redundant Lecs deleted Lecs with index 2 is removed from the LECS-order databaseDOL Del from Lecs ordered list LES Redundancy Parameters LES Redundancy Parameters LRM Change LE Service Redundant Lane Services on page 137 in the Operations GuideRDN LE Service redundancy setup Redundancy Mode Startup Delay Changed LRD Set LE Service redundancyStartup delay 600 Lane Version Get Switch LaneVersion Command Actions Not to a specific Elan Parameter Format or Range Lane version Lane version of the switch is changedThat join after the change Mpoa Devices ConfigurationConfiguration Command Actions Display Current MPS Mpoa Server Configuration Parameters Mpoa Server Configuration ParametersDescribes the Mpoa Server configuration parameters Variable Name Description Enter 2 5 1 2 Lifetime Command Actions Set Keep-AliveSets the MPS-p2 keep-alive lifetime parameter Parameter Format or Range Internetwork-layer Layer Protocols Command ActionsSet Internetwork Sets the MPS-p3 protocols parameter Protocols LEM LAN Emulation MPA Mpoa Devices ConfigurationMPS Mpoa Server Configuration MP4 Set initial retry time MP5 Set retry time maximum Maximum Command ActionsSet Retry Time Sets the MPS-p5 retry time maximum parameter 10 300 seconds Set Give Up Time Sets the MPS-p6 give-up time parameter Time Command Actions MP7 Set default holding time Enter 2 5 2 Following information is displayed Mpoa Client Configuration Parameters Mpoa Client Configuration ParametersDescribes the Mpoa Client configuration parameters Frame Count Command Actions MPC Mpoa Client Configuration Frame Time Command Actions Flow detection protocols parameter is set Protocols Command ActionsParameter Format or Range Flow detection protocols Command Result Set Retry Time Sets the MPC-p5 retry time maximum parameter 30 1200 seconds Set Hold Down Time Sets the MPS-p6 hold down time parameterMP6 Set hold down time Lecs Address You can configure the resident Lecs address as followsUpdate Resident Lecs Address Display Resident Lecs Address Address Command Actions LCS LE Config Service Bytes. The update takes place immediatelyResident Lecs address is updated LSP Set resident Lecs addr Command Actions Enter 2 1 Search policy of the resident Lecs is displayed Lecs Elan Database Operations Elan LES Parameters Elan LES ParametersDescribes the Elan LES parameters LNT Lecs network topology Database Command ActionsLCS LE Configuration Service LEP Display Elan type & params Describes the Elan parameters in the Lecs database Database that you can updateElan Parameters in Lecs Database Elan Parameters in Lecs Database Enter 2 1 5 3 elan6914 1 MAD Display all MAC addresses Addresses Command ActionsMAC MAC Addresses Info MAC MAC Address Info Delete Elan MAC Delete a MAC address inserted from an ElanSpecified MAC address is deleted from the Elan DEL Delete MAC Address Console responds with the confirmation ATM ATM Address Info AAD Display all ATM addresses ATM address was deleted for this elan Specified ATM address is deleted from the ElanATM ATM Addresses Info System responds with the confirmation ANE Add new Elan record New elan was added Enter 2 1 5 Elan record was deleted Confirmation message is displayedDEL Delete Elan recor d Segment ID is added to the Lecs database Segment id has been updatedYou cannot assign a segment ID to a non-token ring Elan SEG Edit segment id C23, for Lecs Statistics Parameters Signaling Statistics ParametersDescribes the signaling statistics parameters Describes the Lecs statistics parameters Enter 2 1 Lecs database statistics are displayed Enter 2 1 Following prompt is displayed Enter 2 1 8 Following message is displayed Display Lecs Maximum Connection NumberShows how many LECs the Lecs database may contain Number of Lecs Update Lecs Maximum Connection NumberSets the number of LECs the Lecs database may contain Connections LAN Emulation Redundancy Elan RDN LE Service redundancyALS Add redundant LES to Redundant LES successfully added Enter 2 1 5 9 2 elan739 FEP Force Elan to Primary Enter 2 1 5 9 3 elan739 Display Redundant ELANs General Information Display general information about redundant ELANs Redundant ELANs General Parameters Redundant ELANs General ParametersDescribes the ELANs general parameters Display Redundant ELANs Specific Information Display specific information about Redundant ELANs Redundant ELANs Specific Parameters Redundant ELANs Specific ParametersDescribes the ELANs specific parameters Redundant LES General Parameters LES General Command Actions InformationDisplay general information on a redundant LES Describes the redundant LES general parameters LES Specific Information Command Actions Enter 2 1 Following information is displayed LES Display LES-BUS Addresses You can configure the LES address, as followsUpdate Elan LES-BUS Address Display LES-BUS Enter 2 2 Following information is displayed Enter 2 2 3 1 1 2 c0.da.60 .49 Direct access sequence 2 2 Enter 2 2 Following information is displayed Elan #4 is of Token Ring type Elan Parameters for Resident LESsDescribes the Elan parameters for resident LESs Elan Parameters for Resident LESs Database Elan Parameters for a LES Parameters of the Elan with ID 14 are updatedDescribes the Elan parameters that can be updated Elan Parameters for a LES Learp Policy Configuration Display Elan Response Policy Elan Response Policies Elan Response PoliciesDescribes the Elan response policies Enter 2 2 Following messages are displayed Possible Learp policies Learp policies Learp Verification PoliciesDescribes the Learp verification policies Learp Verification Policies Enter 2 2 3 1 5 2 Managing LAN Emulation Describes the Learp policies for the route descriptor Example Enter 2 2Learp Policies for Route Descriptor Learp Policies for Route Descriptor Enter 2 2 3 1 7 2 Response policy, and Learp response policies Following prompt appear Direct access sequence 2 2 3 1 Lane multicast forward delay time is updated Update Lane Multicast Forward DelayUpdate the Lane multicast forward delay parameter Enter 2 2 Following message appears Connection Info LEC OperationsDisplay LEC LEC Connection Information Parameters LEC Connection Information ADD Clients MAC Addresses Lecid Emulation Statistics Command Actions Display LAN Enter 2 2 3 4 1 Enter 2 2 3 4 2 2 LEC Statistics LEC StatisticsDescribes the LEC statistics parameters NameDescription ELN ELANs Information LES LE ServicesRES Reset General LE Statistics Enter 2 2 3 Following message is displayed DSL Destroy specific LEC Enter Y to confirm, N to cancel the reset request Enter 2 2 5 Following prompt appears Managing LAN Emulation LEC Elan Admission Security Enter 2 3 1 1 Enter 2 3 1 2 1 Security List LECs in ElanSecurity List Enter 2 3 2 1 Session Command to initialize the Elan security list Enter 2 3 2 4 1 47.0.0.0.0.0.3c.0.0.a0 Enter Y to continue, N to cancel Enter 2 3 2 6 1 CHK Perform a security check Security Status Command Actions Switch SecurityDisplay Switch SST Set switch security state SEC LE Security ConfigurationSWS Switch security Security on switch now Enabled Save Security Restore Security ConfigurationSave Security Direct access sequence 2 3 LEC Elan Admission Security Configuring the Route Cache Showing Pnni Information Pnni Current Pnni State Following command allows you to view the current Pnni stateViewing Display PNNI/E-IISP State Configuring Pnni Nodes Enter 1 1 9 4 1 State Operations Guide for more information on E.164 196 in the Operations Guide for more information on E.164 Enter 1 1 Following message is displayed Enter 1 1 9 4 3 1 Enter 1 1 9 4 3 2 To UP Command Actions Pnni node administrative status is set to UP To Down reboot Command Actions Pnni node administrative status is set to Down PDB Purge whole Pnni Enter 1 1 9 4 3 3 1 Following message is 7displayed Node level of node 1 is set to 3 3 2 Default ATM address takes place after the next reboot 9 4 3 3 2 3 parameters Address is updated to its new value 9 4 3 3 3 3 3 3 9 4 3 3 4 3 3 4 SID Set Node ID Node ID is updated to its new value 3 3 5 Name of the node is updated to 3Com World 9 4 3 3 6 9 4 3 3 6 2 parameters Configuring and Managing Pnni 9 4 3 4 1 parameters 9 4 3 4 2 parameters 9 4 3 4 3 parameters 9 4 3 4 4 parameters 9 4 3 4 5 parameters 9 4 3 4 6 parameters Interval takes place after the next reboot 9 4 3 4 8 parameters 9 4 3 4 9 parameters 9 4 3 4 10 parameters 9 4 3 4 11 parameters 9 4 3 4 12 parameters 9 4 3 4 13 parameters Enter 1 1 9 4 3 4 14 Enter 1 1 9 4 3 4 15 Enter 1 1 9 4 3 4 16 Default Values Command Actions All the timers are set to the default values Setting Optimization Metrics Classes of Service Optimization Metrics Table Parameters Optimization Values Value Description Value of the CBR optimization parameter is updated Value of the RealTime-VBR optimization parameter is updated 9 4 3 5 2 3 parameters 9 4 3 5 2 4 parameters Value of the UBR optimization parameter is updated to All Classes to Default Command Actions Select Port for Interface Parameter Setting Parameter Format or Range Port number Slot.subslot.port Configuring and Managing Pnni 9 4 4 2 1 parameters Weight bit rate service category 9 4 4 2 3 parameters 9 4 4 2 4 parameters 9 4 4 2 5 parameters Weight unspecified bit rate service category 9 4 4 2 To Default Values Command Actions Scope Mapping Table Parameters Managing Scope MappingScope Mapping Table Parameters Pnni Scope PnniScopeLocalNetworkPlusTwo Enter 1 1 Following information is displayed MST Modify Scope Mapping Hierarchical level of pnniScopeGlobal is updated to After the next reboot Configuring the Route Cache Get Cache State SCS Set Cache State Will continue to be used when an ADD Party route is added 11 1 9 10 4 6 After this number of calls, the cache will be refreshed 9 4 6 6 parameters Information Following commands allow you to display Ptse and other PnniShowing Pnni Display All PTSEs Ptse Table Parameters Ptse Table Parameters Node Topology Link Section Ptse Table Parameters Node Address Section Ptse Table Parameters Statistics Section Enter 1 1 9 4 7 Information Command Actions Node Ptse Table Parameters Example Topology Link Ptse Table Parameters Example Address Table Command Actions Summary Address Table Parameters Node Address Ptse Table Parameters Example Peer Group Leader Table Parameters Peer Group Leader Table Parameters Enter 1 1 Following information is displayed Neighbor Information Command Actions Peer Group Neighbor Table Parameters Information node is up Command Actions Statistics Table Parameters Environmental SafetyPhysical Standards Supported ConnectorsElectromagnetic Compatibility Interface LEDs Management Setup Menu Index 180 164165 182 174 171173 176 113 137112 114 107 102101 108 251 249250 253 280 266267 283 311 310286 314 230 228229 231 156 151153 157 202 199201 204 333 330332 334 354 352353 355 378 375377 379 400 398399 401 Appendix B Menu Index Online Technical ServicesServices 3Com Hours a day, 7 days a week Access by Analog ModemUsername anonymous Country Data Rate Telephone Number 408 727 Access by Digital Modem847 262 Europe, South Africa, and Middle East Country Telephone Number Asia, Pacific Rim Country Telephone Number Fax Number Appendix C Technical Support Glossary Module Software LED Application LMA Module Status LED Indicator LEDSoftware Error LED Multiplexing Glossary Index Numbers Call admission control 28 call-proceeding enable value Efci site marking 28 Elan emulated LAN Learp MIB II Pnni Ptse Storage humidity 421 subnet mask configuration Displaying 66 write-access password updating Index 3Com Corporation Limited Warranty Additional Services