Users Guide

Network Administration: Port Settings 171
FILE LOCATION: C:\Users\gina\Desktop\Checkout_new\Dell Astute\User
Guide\Dell_Astute_Network_Admin_PortSettings.fm
DELL CONFIDENTIAL – PRELIMINARY 8/9/16 - FOR PROOF ONLY
• Auto — Use to automatically detect the cable type.
•
MDIX — Use for hubs and switches.
•
MDI — Use for end stations.
–
Current MDI/MDIX — Displays the current device MDIX settings.
–
LAG — Displays whether the port is part of a LAG.
Port and VLAN Mirrorings
Switches usually only forward frames to relevant ports. To monitor traffic,
either for information gathering, such as statistical analysis, or for
troubleshooting higher-layer protocol operation, the Mirroring feature
forwards frames to a monitoring port.
Mirroring provides the ability to specify that a desired destination (target)
port will receive a copy of all traffic passing through designated source ports.
The frames arriving at the destination port are copies of the frames passing
through the source port at ingress, prior to any switch action.
It is possible to specify several source ports to be monitored by a single target
port. However, in this case, the traffic sent to the target port is placed in the
target port's queues on a first come, first served basis, and any excess traffic is
silently discarded. This may mean that the traffic actually seen by any device
attached to the target port is an arbitrarily selected subset of the actual traffic
going through the source ports.
Port mirroring is only relevant to physical ports. Therefore, if you want a LAG
to function as the source of a port mirroring session, the member ports must
be individually specified as sources.
Up to eight sources can be mirrored. This can be any combination of eight
individual ports.
Before configuring mirroring, note the following:
• Monitored ports cannot operate faster than the monitoring port.
• All the Rx and/or Tx packets of a source (monitored) port should be
mirrored to the same target (monitoring) port.
Destination Port Restrictions
The following restrictions apply to destination ports:
• Destination ports cannot be configured as source ports.