Specifications

show spanning-tree
231
Item Meaning Displayed information
Port Information Information about the ports
of the MST instance
Displays information about the ports managed by
Multiple Spanning Tree.
If no VLANs are allocated to the MST instance, a
response message is displayed because there are
no ports.
IF# Interface port number Number of the interface port whose information is to
be displayed
ChGr Channel group number Displays the number of the channel group for which
information is displayed.
This item is displayed if a port list is not specified or
if a port belonging to a channel group is specified in
the port list.
Up The port is in Up status. Indicates that the port is in Up status.
If link aggregation is used, this means that the
channel group is in Up status.
Down The port is in Down status. Indicates that the port is in Down status.
If link aggregation is used, this means that the
channel group is in Down status.
Status Port state Discarding: Discarding
Learning: Learning
Forwarding: Indicates Forwarding status.
Disabled: Disabled
This parameter becomes Disabled if the port is in
the Down status.
Role The role of the port Root: Root port
Designated: Designated port
Alternate: Alternate port
Backup: Backup port
Master: Master port
If the port is in the Down status, a hyphen (-) is
displayed, because ports in this status are not
included in the topology calculations.
Boundary Boundary port Indicates that the port is the boundary port for the
region. If the role of the partner device port is
alternate port or backup port, the boundary port
might never receive BPDUs. In such cases, the port
is not displayed as the boundary port.
PortFast PortFast Indicates that the port is a PortFast port.
(Received): Indicates that the port is subject to
the Spanning Tree topology calculations because
BPDUs are received while PortFast is being
applied.
BPDUGuard Application of the BPDU
guard functionality for
PortFast
Indicates that the port is a PortFast port, and that the
BPDU guard functionality is applied.
(Received): Indicates that the port is down
because BPDUs are received while PortFast is
being applied.
BPDUFilter BPDU filter Indicates that the BPDU filter functionality is