Specifications

12-30 STP Commands
BPDU in processing FALSE
num of similar BPDU's to process 0
received_inferior_bpdu FALSE
next state 0
src MAC count 21807
total src MAC count 21825
curr_src_mac 00-0b-0e-00-04-30
next_src_mac 00-0b-0e-02-76-f6
Table 12‐4describesthefieldsinthisdisplay.
Table 12-4 Output for show spantree statistics
Output What It Displays...
Port Port number.
VLAN VLAN ID.
Spanning Tree enabled for vlan State of the STP feature on the VLAN.
port spanning tree State of the STP feature on the port.
state STP state of the port:
• Blocking—The port is not forwarding Layer 2 traffic but is listening to
and forwarding STP control traffic.
• Disabled—The port is not forwarding any traffic, including STP control
traffic. The port might be administratively disabled or the link might be
disconnected.
• Forwarding—The port is forwarding Layer 2 traffic.
• Learning—The port is learning the locations of other devices in the
spanning tree before changing state to forwarding.
• Listening—The port is comparing its own STP information with
information in STP control packets received by the port to compute the
spanning tree and change state to blocking or forwarding.
port_id STP port ID.
port_number STP port number.
path cost Cost to use this port to reach the root bridge. This is part of the total path
cost (designated cost).
message age Age of the protocol information for a port and the value of the maximum
age parameter (shown in parenthesis) recorded by the switch.
designated_root MAC address of the root bridge.
designated cost Total path cost to reach the root bridge.
designated_bridge Bridge to which this switch forwards traffic away from the root bridge.
designated_port STP port through which this switch forwards traffic away from the root
bridge.
top_change_ack Value of the topology change acknowledgment flag in the next configured
bridge protocol data unit (BPDU) to be transmitted on the associated port.
The flag is set in reply to a topology change notification BPDU.