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Multiple Instance Spanning-Tree Operation
Troubleshooting an MSTP Configuration
Exceeded Max Hops
MSTI MSGs
Number of times that an MSTI MSG packet is received from a bridge internal to the MST
region with an MSTI Remaining Hops value less than or equal to 1. This may occur if the
receiving bridge is located too far from the MSTI regional root bridge (beyond the
configured size of the MST region on the MSTI regional root bridge) or if a BPDU packet
with invalid MSTI regional root bridge information is continuously circulating between
bridges in an MST region and needs to be aged out. This counter is maintained on a per-
MSTI per-port basis.
Topology Changes
Detected
Number of 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 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.
Topology Changes Tx Number of times that Topology Change information is propagated (sent out) through the port
to the rest of the network.
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.
Topology Changes Rx Number of times that Topology Change information is received from the peer port.
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.
Topology Change ACKs
Tx
Number of 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
Rx
Number of 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.
TCN BPDUs Tx Number of 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 Rx Number of 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.
CFG BPDUs Tx Number of (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 Rx Number of (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.
Field Description
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