Cisco ESW 500 - Page 296

Configuring Spanning Tree
Defining Multiple Spanning Tree
ESW 500 Series Switches Administration Guide 285
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- Listening — Indicates that the port is in Listening mode. The port cannot
forward traffic nor can it learn MAC addresses.
- Learning — Indicates that the port is in Learning mode. The port cannot
forward traffic, however it can learn new MAC addresses.
- Forwarding — Indicates that the port is in Forwarding mode. The port
can forward traffic and learn new MAC addresses.
• Type — Indicates if the port is a point-to-point port, or a port connected to a
hub. The possible field values are:
- Boundary Port — Indicates the port is a boundary port. 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
- Master Port — Indicates the port is a master port. A Master port
provides connectivity from a MSTP region to the outlying CIST root.
- Internal — Indicates the port is an internal port.
• 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
when a LAN has two or more connections connected to a shared
segment.
- Disabled — Indicates the port is not participating in the Spanning Tree.
• Mode — Indicates the current Spanning Tree mode. The possible field values
are:
- STP — Indicates that Classic STP is enabled on the port.
- RTSP — Indicates that Rapid STP is enabled on the port.
- MSTP — Indicates that MSTP is enabled on the port.