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Trunk Statistics
Note the following considerations when configuring trunks and trunk members:
All ports in a trunk must have the same full-duplex speed.
Loop protection is supported on static trunks, but not on dynamic trunks. If loop protection is
enabled on a static trunk that is now being changed to a dynamic trunk, loop protection will be dis-
abled on the trunk.
A port that is added to a trunk loses its port VLAN membership and is assigned the VLAN mem-
berships configured for the trunk. Individual port VLAN memberships cannot be configured for
ports that are members of a trunk. When the port is removed from a trunk, the port is made a
member of the default VLAN.
When ports are members of a trunk, they take on the STP configuration for the trunk. When ports
are removed from a trunk, the take on their earlier configured STP states.
Click
Apply
to save any changes to the currently selected trunk. The changes take effect immediately.
Trunk Statistics
The Trunk Statistics page displays the flap count for each trunk. A flap occurs when a trunk interface or
trunk member port goes down.To display the Trunk page, click
Trunks
>
Statistics
in the navigation pane.
Figure 59. Trunk Statistics Page
Table 40. Trunk Statistics Fields
You can click
Clear Counters
to reset the flap count statistics to 0.
Field
Description
Trunk Name
The user-created name for the trunk.
Type
The interface type, which is either Port-Channel (a trunk) or Member Port (a physical port).
Flap Count
The number of times the interface has gone down. The counter for a member port is
incremented when the physical port is either manually shut down by the administrator or when
its link state is down. When a trunk is administratively shut down, the flap counter for the trunk
is incremented, but the flap counters for its member ports are not affected. When all active
member ports for a trunk are inactive (either administratively down or link down), then the
trunk flap counter is incremented.