Management and Configuration Guide K/KA/KB.15.15

ports C1 and C2 are configured as a static trunk named Trk1,
they are listed in the Spanning Tree display as Trk1 and do not
appear as individual ports in the Spanning Tree displays.
When Spanning Tree forwards on a trunk, all ports in the trunk
will be forwarding. Conversely, when Spanning Tree blocks a
trunk, all ports in the trunk are blocked.
NOTE: A dynamic LACP trunk operates only with the default
Spanning Tree settings. Also, this type of trunk appears in the
CLI show spanning-tree display, but not in the Spanning
Tree Operation display of the Menu interface.
If you remove a port from a static trunk, the port retains the same
Spanning Tree settings that were configured for the trunk.
Figure 58 Example of a port trunk in a Spanning Tree listing
IP multicast protocol (IGMP): A static trunk of any type appears in the IGMP configuration
display, and you can configure IGMP for a static trunk in
the same way that you would configure IGMP on a
non-trunked port. (Note that the switch lists the trunk by
name—such as Trk1—and does not list the individual ports
in the trunk.) Also, creating a new trunk automatically places
the trunk in IGMP Auto status if IGMP is enabled for the
default VLAN.
A dynamic LACP trunk operates only with the default IGMP
settings and does not appear in the IGMP configuration
display or show ip igmp listing.
VLANs: Creating a new trunk automatically places the trunk in the
DEFAULT_VLAN, regardless of whether the ports in the trunk
were in another VLAN. Similarly, removing a port from a
trunk group automatically places the port in the default
VLAN. You can configure a static trunk in the same way
that you configure a port for membership in any VLAN.
NOTE: For a dynamic LACP trunk to operate in a VLAN
other than the default VLAN (DEFAULT_VLAN), GVRP must
be enabled.
Port security Trunk groups (and their individual ports) cannot be
configured for port security, and the switch excludes trunked
ports from the show port-security listing. If you
configure non-default port security settings for a port, then
subsequently try to place the port in a trunk, you see the
following message and the command is not executed:
<port-list> Command cannot operate over a logical
port.
Trunk configuration methods 149