HP PROCURVE 2520 User Manual

C
Troubleshooting
Contents
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-4
Troubleshooting Approaches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-5
Browser or Telnet Access Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . C-6
Unusual Network Activity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-8
General Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-8
802.1Q Prioritization Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-9
IGMP-Related Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-9
LACP-Related Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-10
Port-Based Access Control (802.1X)-Related Problems . . . . . . . . . C-10
QoS-Related Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-13
Radius-Related Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-14
Spanning-Tree Protocol (MSTP) and Fast-Uplink Problems . . . . . . C-15
SSH-Related Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-16
TACACS-Related Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-17
TimeP, SNTP, or Gateway Problems . . . . . . . . . . . . . . . . . . . . . . . . . C-19
VLAN-Related Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-19
Fan Failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-21
Using the Event Log for Troubleshooting Switch Problems . . . . C-22
Event Log Entries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-22
Menu: Displaying and Navigating in the Event Log . . . . . . . . . . . . . C-28
CLI: Displaying the Event Log . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-29
CLI: Clearing Event Log Entries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-29
CLI: Turning Event Numbering On . . . . . . . . . . . . . . . . . . . . . . . . . . . C-30
Using Log Throttling to Reduce Duplicate
Event Log and SNMP Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-30
Log Throttle Periods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-31
Example of Event Counter Operation . . . . . . . . . . . . . . . . . . . . . C-31
C-1

HP PROCURVE 2520 Specifications

General

Web Interface	Yes
CLI Support	Yes
IPv6 Support	Yes
Auto-MDIX	Yes
SNMP Support	Yes
Quality of Service (QoS)	Yes
VLAN Support	Yes
Jumbo Frame Support	Yes