Table 25 Trunk Configuration Fields
(continued)
Description
Field
Mode (static or dynamic) configured for the trunk.
Mode
Select the trunk membership for a port. By default, no ports belong to any trunk. A grayed
out port indicates that it has been configured for port mirroring (destination or source port),
Port Members
or that it is set to half duplex. The user is not allowed to perform any trunk membership
configuration on this port until the port is removed from the mirroring configuration or is
reconfigured to full duplex mode.
Traffic across a trunk is distributed among trunk members. All ports in a trunk have the same full
duplex speed.
Loop protection is not supported on LACP trunks. Loop protection will be auto-disabled if it was
previously enabled on a static trunk that is now being configured as LACP Active or Passive.
RSTP can be enabled on a trunk. When RSTP is either enabled or disabled on a trunk, the individual
Port members lose their STP configuration and will take on the trunk's configuration. When ports
are removed from a trunk, the port members return to their earlier configured STP states.
An active port (LACP and Static active members) added to a trunk loses port VLAN membership
and is assigned to that trunk group’s VLAN membership. When the port is removed from a trunk
it reverts to the default VLAN.
Trunk Modes
A trunk can be configured in four different modes: Disabled, Static, LACP Active, and LACP Passive.
After configuring trunk modes, click
Apply
to save changes to the selected trunk. Changes take
effect immediately.
Disabled Trunk Mode
When a trunk is disabled, no traffic flows and LACPDUs are dropped. The links that form the trunk
are not released.
In the example in
Figure 30
TRK1, TRK2, and TRK3 are configured in
Disabled
Mode.
Figure 30 Disabled Trunk Mode
44
Trunks
