Hitachi US7070447-001 manual Troubleshooting Ethernet

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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