Advanced Traffic Management Guide K/KA/KB.15.15

Table 9 MSTP debug command output: field descriptions (continued)
Displays the number of...Field
MST region and needs to be aged out. This counter is maintained on a per-MSTI per-port
basis.
Times that a Topology Change event is detected by the CIST or MSTI port and the port
triggers a topology change propagation throughout the network. A Topology Change
Topology Changes
Detected
event occurs when a non-edge port enters forwarding state. This counter is maintained
on a per-CIST per-port and on a per-MSTI per-port basis.
Times that Topology Change information is propagated (sent out) through the port to the
rest of the network.
Topology Changes Tx
For a CIST port, the counter is the number of times that a CFG, RST or MST BPDU with
the TC flag set is transmitted out of the port.
For an MSTI port, the counter is the number of times that a MSTI configuration message
with the TC flag set is transmitted out of the port.
This counter is maintained on a per-CIST per-port and on a per-MSTI per-port bases.
Times that Topology Change information is received from the peer port.Topology Changes Rx
For a CIST port, the counter is the number of times that a CFG, RST or MST BPDU with
the TC flag set is received.
For an MSTI port, the counter is the number of times that an MSTI configuration message
with the TC flag set is received.
This counter is maintained on a per-CIST per-port and on a per-MSTI per-port basis.
Times that the Topology Change acknowledgement is transmitted through the port (number
of CFG, RST or MST BPDUs transmitted with the Topology Change Acknowledge flag
set). This counter is maintained by the CIST (default MST instance 0) on a per-port basis.
Topology Change ACKs
Tx
Times the Topology Change acknowledgement is received on the port (number of CFG,
RST or MST BPDUs received with the Topology Change Acknowledge flag set). This
counter is maintained by the CIST (default MST instance 0) on a per-port basis.
Topology Change ACKs
Rx
Topology Change Notification BPDUs that are transmitted through the port. This counter
is maintained by the CIST (default MST instance 0) on a per-port basis.
TCN BPDUs Tx
Topology Change Notification BPDUs that are received on the port. This counter is
maintained by the CIST (default MST instance 0) on a per-port basis.
TCN BPDUs Rx
802.1D Configuration BPDUs that are transmitted through the port. This counter is
maintained by the CIST (default MST instance 0) on a per-port basis.
CFG BPDUs Tx
802.1D Configuration BPDUs that are received on the port. This counter maintained by
the CIST (default MST instance 0) on a per-port basis.
CFG BPDUs Rx
802.1w RST BPDUs that are transmitted through the port. This counter is maintained by
the CIST (default MST instance 0) on a per-port basis.
RST BPDUs Tx
802.1w RST BPDUs that are received on the port. This counter is maintained by the CIST
(default MST instance 0) on a per-port basis.
RST BPDUs Rx
802.1s MST BPDUs that are transmitted through the port. This counter is maintained by
the CIST (default MST instance 0) on a per-port basis.
MST BPDUs Tx
802.1s MST BPDUs that are received on the port. This counter is maintained by the CIST
(default MST instance 0) on a per-port basis.
MST BPDUs Rx
Times that a configuration message for a specific MSTI was encoded in (802.1s) MST
BPDUs that are transmitted through the port. This counter is maintained on a per-MSTI
per-port basis.
MSTI MSGs Tx
Times that the MSTI detected a configuration message destined to the MSTI in (802.1s)
MST BPDUs received on the port. This counter is maintained on a per-MSTI per-port basis.
MSTI MSGs Rx
118 Multiple instance spanning tree operation