Reference Guide

Spanning Tree 331
MSTP Interface Settings
To assign interfaces to MSTP instances:
1
Click Switching > Spanning Tree > MSTP Interface Settings in the tree
view to display the
MSTP Interface Settings: Summary page.
MSTP interface settings for the selected instance is displayed.
2 To set MSTP settings for an interface, click Edit .
3 Select an instance, and enter the fields:
–
Interface ID — Assign either ports or LAGs to the selected MSTP
instance.
–
Port State — Displays whether the port is enabled or disabled in the
specific instance.
–
Ty p e — Displays whether MSTP treats the port as a point-to-point
port, or a port connected to a hub, and whether the port is internal to
the MST region or a boundary port. A Master port provides
connectivity from a MSTP region to the outlying CIST root. A
Boundary port attaches MST bridges to LAN in an outlying 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.
–
Role — Displays the port role assigned by the STP algorithm in order
to provide to STP paths. The possible options are:
•
Root — This port provides the lowest cost path to forward packets
to root switch.
•
Designated — This port is the interface through which the bridge
is connected to the LAN, which provides the lowest cost path
from the LAN to the Root Bridge.
•
Alternate — This port provides an alternate LAG to the root
switch from the root interface.
•
Backup — This port provides a backup path to the designated
port. Backup ports occur only 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 connections connected to a shared segment.
•
Disabled — This port is not participating in the Spanning Tree.
–
Interface Priority — Enter the interface priority for specified instance.