Operation Manual

STP Commands
Mobility System Software Command Reference Guide
Version 7.3
13 – 372
message age timer Status of the message age timer. This timer measures the age of the
received protocol information recorded for a port.
message age timer value Current value of the message age timer, in seconds.
topology change timer Status of the topology change timer. This timer determines the time
period during which configured BPDUs are transmitted with the
topology change flag set by this MX switch when it is the root
bridge, after detection of a topology change.
topology change timer value Current value of the topology change timer, in seconds.
hold timer Status of the hold timer. This timer ensures that configured BPDUs
are not transmitted too frequently through any bridge port.
hold timer value Current value of the hold timer, in seconds.
delay root port timer Status of the delay root port timer, which enables fast convergence
when uplink fast convergence is enabled.
delay root port timer value Current value of the delay root port timer.
delay root port timer restarted is Whether the delay root port timer has been restarted.
spanning tree type Type of spanning tree. The type is always IEEE.
spanning tree multicast address Destination address used to send out configured BPDUs on a bridge
port.
bridge priority STP priority of this MX.
bridge MAC address MAC address of this MX switch.
bridge hello time Value of the hello timer interval, in seconds, when this MX switch is
the root or is attempting to become the root.
bridge forward delay Value of the forwarding delay interval, in seconds, when this MX
switch is the root or is attempting to become the root.
topology change initiator Port number that initiated the most recent topology change.
last topology change occurred System time when the most recent topology change occurred.
topology change Value of the topology change flag in configuration BPDUs to be
transmitted by this MX switch on VLANs for which the switch is the
designated bridge.
topology change time Time period, in seconds, during which BPDUs are transmitted with
the topology change flag set by this MX switch when it is the root
bridge, after detection of a topology change. It is equal to the sum of
the switch’s maximum age and forwarding delay parameters.
topology change detected Indicates whether a topology change has been detected by the
switch.
topology change count Number of times the topology change has occurred.
topology change last recvd. from MAC address of the bridge from which the MX last received a
topology change.
dynamic max age transition Number of times the maximum age parameter was changed
dynamically.
port BPDU ok count Number of valid port BPDUs received.
msg age expiry count Number of expired messages.
link loading Indicates whether the link is oversubscribed.
BPDU in processing Indicates whether BPDUs are currently being processed.
num of similar BPDU’s to process Number of similar BPDUs received on a port that need to be
processed.
received_inferior_bpdu Indicates whether the port has received an inferior BPDU or a
response to a Root Link Query (RLQ) BPDU.
Table 13– 3. Output for show spantree statistics (continued)
Field Description