Enterasys Networks 2H252-25R manual SmartSwitch Series 2E253

Page 46

Troubleshooting Checklist

Table 4-2 Troubleshooting Checklist (Continued)

Problem

Possible Cause

Recommended Action

 

 

 

Port(s) goes into

Loop condition detected.

1. Verify that Spanning Tree is

standby for no apparent

 

enabled. Refer to the

reason.

 

SmartSwitch Series 2E253,

 

 

2H252, 2H253 and 2H258 Local

 

 

Management User’s Guide for

 

 

the instructions to set the type of

 

 

STA.

 

 

2. Review network design and

 

 

delete unnecessary loops.

 

 

3. If the problem continues, contact

 

 

Enterasys Networks for

 

 

assistance.

 

 

 

User parameters (IP

1. Position of Mode switch

1. Reenter the lost parameters as

address, Device and

(7), NVRAM Reset, was

necessary. Refer to the

Module name, etc.)

changed sometime before

SmartSwitch Series 2E253,

were lost when the

either cycling power or

2H252, 2H253 and 2H258 Local

2H252-25R power was

pressing the RESET button,

Management User’s Guide for

cycled or the front panel

causing the user-entered

the instructions to configure the

RESET button was

parameters to reset to

device through Local

pressed.

factory default settings.

Management.

 

2. Clear NVRAM was set

2. If the problem continues, contact

 

through Local

Enterasys Networks for

 

Management.

assistance.

 

 

 

4-8Troubleshooting

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Contents 2H252-25R SmartSwitch Installation User’s Guide Page Page Vcci Notice FCC NoticeIndustry Canada Notice Class a ITE NoticeEnterasys NETWORKS, INC Program License Agreement Page Declaration of Conformity Page Contents Troubleshooting Figures Tables About This Guide Using this GuideStructure of this Guide Related Documents Document Conventions Guide uses the following conventionsPage Introduction OverviewConnectivity Runtime IP Address DiscoveryFull Duplex Switched Ethernet SmartTrunkPort/VLAN Redirect Functions Remote Monitoring RmonBroadcast Suppression Rate LimitingGarp Switch Operation Flow ControlManagement Switching Options11 802.1 Port Priority Optional HSIMs and VHSIMsStandards Compatibility Lanview Diagnostic LEDsYear 2000 Compliant Getting Help Your email addressNetwork Requirements 10BASE-T Network100BASE-TX Network Installation Unpacking the DeviceInstalling Options Guidelines for Tabletop and Shelf Installations Installing the DeviceTabletop or Shelf Installation InstallationRackmount Installation Guidelines for the Rackmount InstallationAttaching the Strain-Relief Bracket Rack Mounting the 2H252-25R Strain-Relief Bracket ScrewsRackmount Bracket Screws Connecting Power Redundant Primary AC outlets are On separate circuitsConnecting to the Network Connecting Twisted Pair Cables to Fixed PortsConnecting the Twisted Pair Segment Straight-Through Cable Completing the Installation Troubleshooting Using LanviewLanview LEDs PWR CPU FDX Troubleshooting Checklist Local Management User’s Guide2E253, 2H252, 2H253 SmartSwitch Series 2E253 Using the Reset Button Reset ButtonPage Device Specifications SpecificationsPhysical Properties Environmental Requirements Electrical SpecificationsINPUT/OUTPUT Ports COM Port Pinout Assignments Regulatory CompliancePage Optional Installations Mode Switch Bank Settings Required ToolsRemoving the Chassis Cover Optional Installations and Mode Switch Bank Settings B-3 Screws Chassis Cover Front Panel Setting the Mode Switches Figure B-2 Mode Switch Location6Optional Installations and Mode Switch Bank Settings Simm Upgrade Locating SIMMsInstalling the Dram Simm Installing Optional Hsim or Vhsim Interface Modules Figure B-5 Hsim and Vhsim Connector LocationsPage Index NumericsIndex-2