I would chk the device connecting to this port to see if it is
registering any frame loss or TX drops.
If so this could be a Layer 1 issue with dirty connections or just a
misconfig of what one end sees for advertisement of port speed.
On 6/15/19 9:15 AM, Ken Hohhof wrote:
I feel stupid for asking this, but can someone explain to me what the
Rx Fragment count means in Ethernet interface statistics? The usual
online resources are not helping much in this case.
I have an RB4011 with 2 spare Ethernet ports bridged so that I can
monitor the traffic between a customer’s internal network and a
private PTP microwave link to their other building. The Mikrotik is
not doing any layer 3 processing on these ports, and would not be able
to reassemble IP fragments, but what is it using to determine that
packets are “fragments”?
The fragment count incoming from the customer’s Dell switch is around
25% of the total packet count according to the Mikrotik stats. That
number seems alarmingly high. The customer is not complaining about
any issues related to this. Does this just mean the Dell switch is
fragmenting jumbo frames to go over the Ethernet interface, and this
is totally normal? The customer does have fiber between the various
switches in their building.
Or do I have some kind of a configuration problem? The settings on
the Mikrotik interface are MTU=1500, L2 MTU=1592, Max L2 MTU=9578.
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