Hitachi US7070447-001 manual Troubleshooting Ethernet, To clear the buffer queues

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Draft Level—Hitachi Confidential

HiSpeed Switch Troubleshooting GUide

Troubleshooting Ethernet

Problem: Switch is not reporting any port statistics even with traffic on my network.

Solution: By default, port statistics is disabled on the switch.

/ETHERNET/CONFIG >stat

Note: Enabling stats may cause a slight degradation to performance on the switch.

Problem: Network is experiencing a large number of packet losses..

Solution: The following solutions apply:.

￿Port settings are set properly on the switch.

/ETHERNET/CONFIG >port

￿Check the Ethernet error statistics on the switch and take corrective action. (Refer to ‘Common Ethernet errors’ matrix for possible causes). More than likely, there is a physical layer problem caused by bad cabling, malfunctioning NIC, etc. In most cases, packets will be dropped by the switch due to excessive collisions, late collisions, FCS, alignment errors, oversized and undersized frames.

/ETHERNET/SHOW >count <port#>

￿Transmit and receive queues can get full when the switch port is oversubscribed with traffic. Check the ‘discBuffFull’ and ‘discMemFull’ counters and verify if they are incrementing.

/ETHERNET/SHOW >count <port#>

To clear the buffer queues:

/ETHERNET/CONFIG/FLUSH >PORTFLUSH <port#>

/ETHERNET/CONFIG/FLUSH >ALLPORTFLUSH

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Contents Troubleshooting Guide #&$$% Table of Contents Chapter Fundamentals of Networking Chapter Methods of Managing the SwitchChapter Cabling Chapter Vlan Concepts Chapter Troubleshooting at the MAC LayerChapter Bridging Concepts Chapter Troubleshooting at the Network Layer Chapter Basic ATM ConceptsChapter Fddi Concepts IndexViii List of Figures HS150-100-16 base model with an HS150-100-8E expansionViii List of Tables US7070447-001 Basic Troubleshooting Tips Chapter Introduction Purpose of the GuideHow to Contact Tech Support HIassist@hitachi.com HiSpeed Switch Troubleshooting Guide Chapter HiSpeed Switch What is the HiSpeed Switch? Basic Product Features SupportedAvailable Configurations Base model configurations Total Model Mbps Uplink Upgrades To Ports TX Ports FX PortsHS140/150-010 Model HS140/150-100 ModelModule Number Mbps HiSpeed switch expansion modulesExpansion Modules Mbps Base Model TX Ports FX PortsModel Ports Type Base Model UpLink ModulesUplink modules for the HS15-010 and HS150-100 Chapter Hardware Diagnostics Observing LEDsModule LEDs Reset ButtonLEDs LED statusHardware Diagnostics Color Status Description RJ-45 LEDsLEDs on FX ports Color State DescriptionHiSpeed Memory, Boot Prom, Flash Components Factory Switch SettingsHiSpeed Switch Troubleshooting Guide Chapter Cabling Basic Connections10BASE-TX Ports RJ-45 Connector pin assignmentsPin MDI-X Signal 10/100BASE-TX Ports 100BASE-FX PortsConsole Port Pin Assignments Pins Signal NameConsole Port Cabling HiSpeed Switch Troubleshooting Guide Chapter Fundamentals of Networking Examples of Physical Layer devices are repeaters and hubs Network MediaExamples of Layer 2 devices are bridges and switches HiSpeed Switch Troubleshooting GUide Using the Console Port Chapter Methods of Managing the SwitchCLI Command Line Interface Using a Telnet Session Troubleshooting a Console ConnectionTroubleshooting a Telnet Session LoggingHiView Switch Management Windows 95/Windows NTUnix HiView TipsTroubleshooting HiView Snmpc IssuesExample Reload Nowagain MIB CompilerFig2. MIB Browser SNMPTalk Issues Chapter Bridging Concepts Basic Bridging Concepts How Spanning Tree WorksUsing Spanning Tree Troubleshooting Bridging Issues To reduce the STA timer, type CLI Commands VlanHiSpeed Switch Troubleshooting Guide Chapter Vlan Concepts Default VLANs Multiple VLANs VLANsTroubleshooting VLANs Problem Cannot ping a users on a different VlanVlan Tips Useful CLI CommandsDescription CLI command Vlan entry created Vlan EntriesChapter Troubleshooting at the MAC Layer Ethernet Physical Media Specifications Common Ethernet ErrorsEthernet Tips Alignment errorsFCS errors Oversized framesTroubleshooting Ethernet To clear the buffer queuesDisplays all port speeds, duplexity HiSpeed Switch Troubleshooting GUide IP address classes Class Range Subnet MaskOther IP-related Services RIP Routing Information ProtocolStatic Routes vs. Dynamic Routes Default RouteRoute Cache Forwarding vs. IP Forwarding Common Icmp Destination Unreachable Messages Network UnreachableTroubleshooting IP CLI Commands Problem Cannot establish a telnet session to the switchChapter Basic ATM Concepts VPI/VCIPermanent Virtual Circuits vs Switched Virtual Circuits LAN Emulation LaneLAN Emulation Client LEC Classical IP over ATM CIP Point-to-Point Bridging PtopTrunking ATM PtopHitachi HiSpeed ATM Specifications ATM Troubleshooting TipsTroubleshooting Lane Troubleshooting CIP Verify the following using /ATM/SHOW/connection11-9 Troubleshooting Ptop Verify signaling and Ilmi status should be ‘up’ Troubleshooting Trunking Verify all ATM Trunk ports are in a ‘Forwarding’ state using Displays all active ATM circuits Chapter Fddi Concepts Dual RingFddi Uplink Module installed in an HS150 HiSpeed Fddi UplinkCable Connections SAS cable connectionsLED Status Board Status Description Yellow Green Fddi Bridge ModesLED States Forwarding Mode Fddi Troubleshooting TipsFiltering Mode Promiscuous ModeTroubleshooting Fddi Verify that physical port 34 is active using vvpProblem Cannot ping another Vlan over Fddi 12-8 Displays the Fddi MAC Neighbor address table 12-10 71$ IndexE54 C1=5.2 ?U?B*,8

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