Dell N1100-ON, Reference Manual

Page: 642 / 2332

Layer 2 Switching Commands
642
• The time when packet passed through CPU.
• The first 128 bytes of packet.
• The length of full packet (if greater than 128 bytes).
The in-memory capture buffer can be configured to stop when full. This
mode is configured with the command no monitor capture line wrap.
Capturing packets is started by the monitor capture start command .
Capturing packets is stopped automatically when 128 packets are captured
and saved into the RAM. Capturing packets can be stopped manually before
128 packets have been captured using the monitor capture stop command to
halt packet capture.
If capturing is in progress, the
show monitor capture packets command
displays only captured packets that have not yet been displayed during
capturing session. If capturing is stopped, the first (after stopping) show
monitor capture packets command displays packets which have not yet been
displayed during capturing session. The next show monitor capture packets
command displays all saved packets.
If the capturing session is stopped automatically during the period packet
display is in progress, the packets display continues until all saved packets are
shown and then the buffer is cleared. The next invocation of the show
capture packets command will not display any packets. Please note that this
behavior is observed only if the capturing session is stopped automatically
when the packet displaying is in progress.
The in-memory capture can also be configured to wrap. This makes it possible
to display more than 128 packets per capture session if the command show
capture packets is periodically executed while capture is in progress. Saved
packets that have been already displayed during the capturing session are
overwritten in RAM by new captured packets if capturing is still in progress.
In this manner, the limit of displaying 128 packets per session can be
overcome (but only in monitor capture line wrap mode). Packets that have
not been displayed are not overwritten.
Capturing packets is stopped automatically when 128 packets are captured
and have not yet been displayed during capturing session. It is guaranteed
that no one packet will be lost (not be displayed or not be saved) when
capturing is in progress. In this case, the last 128 packets are saved into the
RAM and can be displayed many number of times by executing the command
show monitor capture packets.