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User Manual Managed Switches
213
Receive and Transmit Queue Counters
The number of received and transmitted packets per input and output queue.
Receive Error Counters
Rx Drops
The number of frames dropped due to lack of receive buffers or egress
congestion.
Rx CRC/Alignment
The number of frames received with CRC or alignment errors.
Rx Undersize
The number of short frames (frames smaller than 64 bytes) received with
valid CRC.
Rx Oversize
The number of long frames (frames longer than the configured maximum
frame length for this port) received with valid CRC.
Rx Fragments
The number of frames received with a length of more than 64 bytes and
with an invalid FCS/CRC.
Rx Jabber
The number of frames received with a length of more than MaxSize bytes
but with an invalid FCS/CRC.
Rx Filtered
The number of received frames filtered by the forwarding process.
Transmit Error Counters
Tx Drops
The number of frames dropped due to output buffer congestion.
Tx Late/Exc. Coll.
The number of frames dropped due to excessive or late collisions.
The
Clear
button allows the user to reset all the port counters.
3.14.5 Port Monitoring
The user can configure port mirroring on this page. This function can be used by the administrator to
debug network problems. The selected traffic can be mirrored or copied on a destination port where
a network analyzer can be attached to analyze the network traffic.
As will be explained below, the traffic to be copied to the mirror port is selected as follows:
•
All frames received on a given port (also known as ingress or source mirroring)
•
All frames transmitted on a given port (also known as egress or destination mirroring)
Remote mirroring (RMirror) is an additional function available on the switch to extend the destination
port to another switch of the network. So, the administrator can analyze the network traffic on several
different switches.