SMC Networks 10/100/1000 SMCGS8P-Smart T, C, P, 2-61, STP Port and Trunk Information

S PANNING T REE P ROTOCOL C ONFIGURATION
2-61
STP Port and Trunk Information
The Spanning Tree, STP Port Information and Spanning Tree, STP
Trunk Information display the current status of ports and trunks in
the Spanning Tree.
Command Attributes
•STP Status — Displays current state of this port within the
Spanning Tree:
- Discarding — Port receives STP configuration messages, but
does not forward packets.
- 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.
- Forwarding — Port forwards packets, and continues
learning addresses.
The rules defining port status are:
- A port on a network segment with no other STA compliant
bridging device is always forwarding.
- If two ports of a switch are connected to the same segment
and there is no other STA device attached to this segment, the
port with the smaller ID forwards packets and the other is
discarding.
- All ports are discarding when the switch is booted, then some
of them change state to learning, and then to forwarding.
•Forward Transitions – The number of times this port has
transitioned from the Learning state to the Forwarding state.
•Designated Cost — The cost for a packet to travel from this
port to the root in the current Spanning Tree configuration. The
slower the media, the higher the cost.
b_mgmt.book Page 61 Tuesday, July 8, 2003 5:24 PM