Symptom

‘no link dfe adaptive-tuning’ doesn't take affect. DFE tuning is enabled by default in latest releases. However because of previous issues seen in DAC with Solarflare NIC as a partner the workaround was to disable the link dfe adaptive tuning and then flap the interface. If the flap of interface does not help then a reload has to be issued. Howerver looks like this command does not take affect after flapping the interface. Hence reload had to be given but this command doesn't persist reload.

Conditions

5M DAC cable in 3500-XL connected to Solarflare NIC.

Workaround

Reload of the switch may bring the interface up. For `no link dfe adaptive-tuning` to affect, re-configure followed by copy run start; reload. Follow the steps twice: --------------------------- switch(config)# interface ethernet 1/9 switch(config-if)# link dfe adaptive-tuning switch(config-if)# no link dfe adaptive-tuning switch(config-if)# exit switch(config)# copy running-config startup-config switch(config)# reload

Further Problem Description