278 | Troubleshootingw w w . d e l l . c o m | s u p p o r t . d e l l . c o m In addition to issuing the show switch and show stack commands, use the show stack-port diagcommand to display communication statistics for the stacking ports:Figure 18-263. Using the show stack-port diag commandThe meanings of the fields in the show stack-port diag command are described here:• RBYT – Number of bytes received• RPKT – Number of packets received• TBYT – Number of bytes transmitted• TPKT – Number of packets transmitted• RFCS – Number of Frame Check Sequence (FCS) errors received• RFRG – Number of undersized packets received with bad FCS• RJBR – Number of oversized packets received with bad FCS• RUND – Number of undersized packets received with good FCS• ROVR – Number of oversized packets received with good FCS• TAGE – Aged packets• TABRT – Error packetsPreventing Auto-negotiation MismatchesThe IEEE 802.3ab auto-negotiation protocol manages the switch settings for speed (10 Mbps, 100 Mbps,and 1000 Mbps, excluding SFP module ports) and duplex (half or full). There are situations when thisprotocol can incorrectly align these settings, reducing performance.1. Check the speed and/or auto-negotiation settings to ensure correct configuration.Force10 S50 #show stack-port diag1 - Stack Port A:RBYT:5fdd RPKT:53 TBYT:adf13 TPKT:8f2RFCS:0 RFRG:0 RJBR:0 RUND:0 ROVR:0TAGE:0 TABRT:01 - Stack Port B:RBYT:0 RPKT:0 TBYT:b2d03 TPKT:930RFCS:0 RFRG:0 RJBR:0 RUND:0 ROVR:0TAGE:0 TABRT:0
