Chapter 13 Monitor: Spanning Tree

 

 

 

 

Table 44 Monitor > Spanning Tree > MST Port (continued)

 

LABEL

DESCRIPTION

 

Indentifier (Priority

This field displays the identifier (in priority / port number).

 

/ Port Id)

 

 

 

 

 

Internal Path

.

 

Cost(Operation)

 

 

 

 

 

Regional Root

Root bridge refers to the base of the spanning tree.

 

Bridge

 

 

 

 

 

Internal Root Cost

This field displays the internal root cost.

 

 

 

 

Designated Bridge

For each LAN segment, a designated bridge is selected. This bridge has the lowest cost

 

 

to the root among the bridges connected to the LAN.

 

 

 

 

Port Role

This field displays the state of the port role.

 

 

 

 

Port State

This field displays the state of the port.

 

 

 

13.2.5 STP Statistics

(R)STP detects and breaks network loops and provides backup links between switches, bridges or routers. It allows a Switch to interact with other (R)STP-compliant switches in your network to ensure that only one path exists between any two stations on the network.

The Switch uses IEEE 802.1w RSTP (Rapid Spanning Tree Protocol) that allows faster convergence of the spanning tree than STP (while also being backwards compatible with STP-only aware bridges). In RSTP, topology change information is directly propagated throughout the network from the device that generates the topology change. In STP, a longer delay is required as the device that causes a topology change first notifies the root bridge and then the root bridge notifies the network. Both RSTP and STP flush unwanted learned addresses from the filtering database. In RSTP, the port states are Discarding, Learning, and Forwarding.

Note: In this user’s guide, “STP” refers to both STP and RSTP.

Use this screen to view the Switch’s spanning tree STP statistics. Click Monitor > Spanning Tree

>STP Statistics to access this screen.Figure 62 Monitor > Spanning Tree > STP Statistics

 

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GS1900 Series User’s Guide