Spanning Tree
MSTP Interface Settings
Cisco 350XG & 550XG Series 10G Stackable Managed Switches
275
13
-
Forwarding
—The port on this instance is in Forwarding mode. The port
can forward traffic and learn new MAC addresses.
-
Boundary
—The port on this instance is a boundary port. It inherits its
state from instance 0 and can be viewed on the
page.
•
Port Role
—Displays the port or LAG role, per port or LAG per instance,
assigned by the MSTP algorithm to provide STP paths:
-
Root
—Forwarding packets through this interface provides the lowest
cost path for forwarding packets to the root device.
-
Designated
—The interface through which the bridge is connected to the
LAN, which provides the lowest root path cost from the LAN to the Root
Bridge for the MST instance.
-
Alternate
—The interface provides an alternate path to the Root Bridge
from the root port.
-
Backup
—The interface provides a backup path to the designated port
path toward the Spanning Tree leaves. Backup ports occur when two
ports are connected in a loop by a point-to-point link. Backup ports also
occur when a LAN has two or more established connections to a shared
segment.
-
Disabled
—The interface does not participate in the Spanning Tree.
-
Boundary
—The port on this instance is a boundary port. It inherits its
state from instance 0 and can be viewed on the
page.
•
Mode
—Displays the current interface Spanning Tree mode.
-
If the link partner is using MSTP or RSTP, the displayed port mode is
RSTP.
-
If the link partner is using STP, the displayed port mode is STP.
•
Type
—Displays the MST type of the port.
-
Boundary—
A Boundary port attaches MST bridges to a LAN in a remote
region. If the port is a boundary port, it also indicates whether the device
on the other side of the link is working in RSTP or STP mode.
-
Internal
—The port is an internal port.
•
Designated Bridge ID
—Displays the ID number of the bridge that connects
the link or shared LAN to the root.
