
Multiple Instance
Troubleshooting an MSTP Configuration
Field | Description |
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Exceeded Max Hops | Number of times that an MSTI MSG packet is received from a bridge internal to the MST |
MSTI MSGs | 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 |
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Topology Changes | Number of times that a Topology Change event is detected by the CIST or MSTI port and |
Detected | the port triggers a topology change propagation throughout the network. A Topology |
| Change event occurs when a |
| maintained on a |
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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 |
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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 |
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Topology Change ACKs | Number of times that the Topology Change acknowledgement is transmitted through the |
Tx | 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 |
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Topology Change ACKs | Number of times the Topology Change acknowledgement is received on the port (number |
Rx | 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 |
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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 |
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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 |
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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 |
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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 |
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