Technical data

BLADE OS 5.0 Command Reference

 Chapter 4: The Information Menu BMD00142, November 2009

When STP is used, in addition to seeing if STG is enabled or disabled, you can view the following

STG bridge information:

Table 22 Spanning Tree Parameter Descriptions

Parameter Description

Current Root The Current Root shows information about the root bridge for the

Spanning Tree. Information includes the priority (in hexadecimal

notation) and MAC address of the root.

Priority (bridge) The bridge priority parameter controls which bridge on the network will

become the STG root bridge.

Hello The hello time parameter specifies, in seconds, how often the root bridge

transmits a configuration bridge protocol data unit (BPDU). Any bridge

that is not the root bridge uses the root bridge hello value.

MaxAge The maximum age parameter specifies, in seconds, the maximum time the

bridge waits without receiving a configuration bridge protocol data unit

before it reconfigure the STG network.

FwdDel The Forward Delay parameter specifies, in seconds, the amount of time

that a bridge port has to wait before it changes from listening to learning

and from learning state to forwarding state.

Aging The aging time parameter specifies, in seconds, the amount of time the

bridge waits without receiving a packet from a station before removing

the station from the Forwarding Database.

Priority

(port) The port priority parameter helps determine which bridge port becomes

the designated port. In a network topology that has multiple bridge ports

connected to a single segment, the port with the lowest port priority

becomes the designated port for the segment.

Cost The port path cost parameter is used to help determine the designated port

for a segment. Generally speaking, the faster the port, the lower the path

cost. A setting of 0 indicates that the cost will be set to the appropriate

default after the link speed has been auto negotiated.

FastFwd The FastFwd shows whether the port is in Fast Forwarding mode or not,

which permits the port that participates in Spanning Tree to bypass the

Listening and Learning states and enter directly into the Forwarding state.

State The state field shows the current state of the port. The state field can be

either BLOCKING, LISTENING, LEARNING, FORWARDING, or

DISABLED.