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Ethernet Fabric (VDX, CNA)

Posts: 29
Registered: ‎12-02-2015

TX errors with VDX 6740 switches



Several VDX 6740s in a fabric running 6.0.2b. We observe TX errors on multiple interfaces connected to endpoint devices (mainly Lenovo servers with some F5 appliances). The rate is quite low (4/8 errors per 20-30 seconds interval) but it's still there.


No other errors are reported (0 discards and 0 RX errors) and not all servers are affected. Also, no issues with ISL ports.


I tried to spot a pattern, but in vain: we see it with 1GB/10GB (all copper) interfaces, being a member or not of a Port-channel, under some load or no load at all. Replacing the cable doesn't seem to help.


Any hints would be greatly appreciated.

Posts: 29
Registered: ‎12-02-2015

Re: TX errors with VDX 6740 switches

Nailed it!


Apparently, as per the Release Notes (Limitations and Restrictions):


VDX 6740/6740T/6740T-1G/6940 platforms do not support IP fragmentation. 
MTU errors are reported in “show interface” as “Errors” under the “Transmit Statistics”.

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