C
HAPTER
5
| Monitoring the Switch
Displaying Information on the Spanning Tree
– 231 –
◆ CIST Role – Roles are assigned according to whether the port is part of
the active topology connecting the bridge to the root bridge (i.e., root
port), connecting a LAN through the bridge to the root bridge (i.e.,
designated port); or is an alternate or backup port that may provide
connectivity if other bridges, bridge ports, or LANs fail or are removed.
◆ CIST State – Displays current state of this port within the Spanning
Tree:
â–
Blocking – Port receives STA configuration messages, but does not
forward packets.
â–
Learning – Port has transmitted configuration messages for an
interval set by the Forward Delay parameter without receiving
contradictory information. Port address table is cleared, and the
port begins learning addresses.
â–
Forwarding – Port forwards packets, and continues learning
addresses.
◆ Uptime – The time since the bridge port was last initialized.
WEB INTERFACE
To display information on spanning tree port status, click Monitor, Spanning
Tree, Port Status.
Figure 111: Spanning Tree Port Status
DISPLAYING PORT
STATISTICS FOR STA
Use the Port Statistics page to display statistics on spanning tree protocol
packets crossing each port.
PATH
Monitor, Spanning Tree, Port Statistics
PARAMETERS
These parameters are displayed:
◆ Port – Port Identifier.
◆ MSTP – The number of MSTP Configuration BPDU's received/
transmitted on a port.
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