View Spanning Tree Port Property Statistics
Use the following procedure to view STP Port Property Status on an existing Uplink Interface:
- In the Application View Bar, click LAGs (
). - In the Common Tree, select the OLT. The LAGs screen displays in the Active Application Window.
- In the LAGs screen, select the NNI/Uplinks Interfaces tab.
- Right-click the desired network uplink and select Protocol > Spanning Tree.
- The Spanning Tree Port Property dialog is displayed, with the Statistics tab active.
Figure 1: Spanning Tree Port Property Dialog - Statistics Tab
- The following table describes the contents of each field.
Option Description AID Displays the AID of the selected NET Uplink Interface. Statistics STP BDPUs TX Number of STP Bridge Protocol Data Units (BDPUs) are transmitted on this NET interface. STP BPDUs RX Number of STP BDPUs received over this NET interface. RSTP BDPUs TX Number of Rapid Spanning Tree Protocol (RSTP) BDPUs are transmitted on this NET interface. RSTP BDPUs RX Number of RSTP BDPUs received over this NET interface. MSTP BDPUs TX Number of Multiple Spanning Tree Protocol (MSTP) BDPUs are transmitted on this NET interface. MSTP BDPUs RX Number of MSTP BDPUs received over this NET interface. TCN TX Count of the Topology Change Notices (TCNs) transmitted TCN RX Count of the TCNs received FWD-XN This counter remembers how many times a port transitions from learning to forwarding. In a stable topology, this counter should always show 1. This counter is reset to 0 as the corresponding port goes down and up. So, if the value is higher than 1, it means that the transition this port experienced is the result of an STP recalculation, not of a direct link failure. Age Expiry This counter tracks the number of times the max age expired on this link. Basically, a port expecting BPDUs waits for the max age (default 20 seconds) before considering its designated bridge as lost. Each time this event occurs, the counter is incremented. When the value is not 0, you know that, for whatever reason, the designated bridge for this LAN is unstable or has a problem transmitting its BPDUs. - When finished, click the Close button.
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