IT Network Equipment Supplier
Verify the Rx Pauseand TailDropsfields from the output of the show interface {/}and show hardware internal errors module module #commands for the module with these ports.
For example:
Nexus7K#show interface e7/25Ethernet7/25 is up !--- Output suppressed input rate 1.54 Kbps, 2 pps; output rate 6.29 Mbps, 3.66 Kpps RX 156464190 unicast packets 0 multicast packets 585 broadcast packets 156464775 input packets 11172338513 bytes 0 jumbo packets 0 storm suppression packets 0 runts 0 giants 0 CRC 0 no buffer 0 input error 0 short frame 0 overrun 0 underrun 0 ignored 0 watchdog 0 bad etype drop 0 bad proto drop 0 if down drop 0 input with dribble 0 input discard 7798999 Rx pause TX 6365127464 unicast packets 6240536 multicast packets 2290164 broadcast packets 6373658164 output packets 8294188005962 bytes 0 jumbo packets 0 output error 0 collision 0 deferred 0 late collision 0 lost carrier 0 no carrier 0 babble 0 Tx pause
The pauses on e7/25 indicate that the server is having difficulty keeping up with the amount of traffic sent to it.
Nexus7k#show hardware internal erroe module 2 | include r2d2_tx_taildrop_drop_ctr_q337936 r2d2_tx_taildrop_drop_ctr_q3 0000000199022704 2 - 37938 r2d2_tx_taildrop_drop_ctr_q3 0000000199942292 4 - 37941 r2d2_tx_taildrop_drop_ctr_q3 0000000199002223 5 - 37941 r2d2_tx_taildrop_drop_ctr_q3 0000000174798985 17 -
This indicates that the amount of traffic sent to these device was too much for the interface itself to transmit. Since each interface was configured as a trunk allowing all VLANs and multicast/broadcast traffic counters were low, it appears there is a lot of unicast flooding that may be causing drops for these interfaces.