Cisco ESW 500 - Page 298

Configuring Spanning Tree
Defining Multiple Spanning Tree
ESW 500 Series Switches Administration Guide 287
11
MSTP Interface Table Page
The
MSTP Interface Table Page contains the following fields:
• Instance — Defines the VLAN group to which the interface is assigned.
• Interface — Indicates the port or EtherChannel for which the MSTP settings are
displayed.
• Role — Indicates the port role assigned by the STP algorithm in order to
provide to STP paths. The possible field values are:
- Root — Provides the lowest cost path to forward packets to root device.
- Designated — Indicates the port or EtherChannel via which the
designated device is attached to the LAN.
- Alternate — Provides an alternate path to the root device from the root
interface.
- Backup — Provides a backup path to the designated port path toward
the Spanning Tree leaves. Backup ports occur only when two ports are
connected in a loop by a point-to-point link. Backup ports also occur