Chapter 13 Spanning Tree Protocol
XS1930 Series User’s Guide
144
13.6 Configure Multiple Spanning Tree Protocol
To configure MSTP, click MSTP in the Advanced Application > Spanning Tree Protocol screen. See
Multiple STP on page 139 for more information on MSTP.
Port Role This field displays the role of the port in STP.
• Root - A forwarding port on a non-root bridge, which has the lowest path cost and is the
best port from the non-root bridge to the root bridge. A root bridge does not have a root
port.
• Designated - A forwarding port on the designated bridge for each connected LAN
segment. A designated bridge has the lowest path cost to the root bridge among the
bridges connected to the LAN segment. All the ports on a root bridge (root switch) are
designated ports.
• Alternate - A blocked port, which has a best alternate path to the root bridge. This path is
different from using the root port. The port moves to the forwarding state when the
designated port for the LAN segment fails.
• Backup - A blocked port, which has a backup/redundant path to a LAN segment where
a designated port is already connected when a switch has two links to the same LAN
segment.
• Disabled - Not strictly part of STP. The port can be disabled manually.
Designated Bridge
ID
This field displays the identifier of the designated bridge to which this port belongs when the
port is a designated port. Otherwise, it displays the identifier of the designated bridge for the
LAN segment to which this port is connected.
Designated Port ID This field displays the priority and number of the bridge port (on the designated bridge),
through which the designated bridge transmits the stored configuration messages.
Designated Cost This field displays the path cost to the LAN segment to which the port is connected when the
port is a designated port. Otherwise, it displays the path cost to the root bridge from the
designated port for the LAN segment to which this port is connected,
Table 64 Advanced Application > Spanning Tree Protocol > Status: RSTP (continued)
LABEL DESCRIPTION
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