OPERATIONAL DEFECT DATABASE
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Output discards are seen on ISL interfaces, similar to below: show interface ethernet 7/7 Ethernet7/7 is up admin state is up, Dedicated Interface Hardware: 1000/10000 Ethernet, address: xxxx.xxxx.xxxx (bia xxxx.xxxx.xxxx) snip... TX 4577370 unicast packets 535 multicast packets 0 broadcast packets 4576557 output packets 9955503677 bytes 4566360 jumbo packets 0 output error 0 collision 0 deferred 0 late collision 0 lost carrier 0 no carrier 0 babble 238301 output discard 0 Tx pause
Using a Nexus 7000 and have a ISL to another switch you can see this issue if you have the following command configured on your switch. You would also have to have traffic latency of over 100 ms as well for the drops to be seen on the 7k. system default interface congestion timeout 100 mode edge Please note this issue can be seen if this value has been changed to anything lower than the typical setting of 500 ms. You can verify if you have this configured by running the following command: show run | i timeout - If there is no output then this command is at the default, if you see something similar to the above command, then it has been changed from the default.
Remove the following command from the show running-configuration by doing the following: no system default interface congestion timeout XXX mode edge
You can also confirm if you are having drops from this command by issuing the following command and replacing X with the module you are seeing the output discards on. show hardware internal statistics module X device all | i timeout|drops If you see drops like the following you are hitting this issue: egress_sf_tstmp drops egress_timeout drops
To be completed once the bug has been resolved.
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