Cisco 350XG series Administration Manual page 278

Spanning Tree
STP Interface Settings
Cisco 350XG & 550XG Series 10G Stackable Managed Switches
- 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 device
from the root interface.
- 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 STP Interface Settings
page.
• Path Cost—Set the port contribution to the root path cost or use the default
cost generated by the system.
• Priority—Set the priority value of the port. The priority value influences the
port choice when a bridge has two ports connected in a loop. The priority is
a value from 0 to 240, set in increments of 16.
• Port State—Displays the current STP state of a port.
- Disabled—STP is currently disabled on the port. The port forwards
traffic while learning MAC addresses.
- Blocking—The port is currently blocked, and cannot forward traffic (with
the exception of BPDU data) or learn MAC addresses.
- Listening—The port is in Listening mode. The port cannot forward traffic,
and cannot learn MAC addresses.
- Learning—The port is in Learning mode. The port cannot forward traffic,
but it can learn new MAC addresses.
- Forwarding—The port is in Forwarding mode. The port can forward
traffic and learn new MAC addresses.
• Designated Bridge ID—Displays the bridge priority and the MAC address
of the designated bridge.
• Designated Port ID—Displays the priority and interface of the selected
port.
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