HP Cisco Nexus 5000 Cisco NX-OS System Messages Reference (OL-15994-03, July 2 - Page 659

Chapter 2 System Messages and Recovery Procedures STP Messages Send document comments to [email protected] Error Message STP-2-LOOPGUARD_CONFIG_CHANGE: Loop guard [chars] on port [chars]. Explanation The spanning tree loopguard configuration for the listed interface has been changed. If enabled, the interface will be put into blocking state and marked as loopguard inconsistent when the message age timer expires because no BPDUs were received from the designated bridge. This feature is mainly used to detect unidirectional links. Recommended Action Verify that this is the desired configuration for the listed interface. Correct it if this is not the desired configuration otherwise no further action is required. Error Message STP-2-LOOPGUARD_UNBLOCK: Loop guard unblocking port [chars] on [chars]. Explanation The listed interface has received a BPDU and therefore if the inconsistency was due to an unidirectional link failure, now the problem is not there anymore. The loop guard inconsistency is cleared for the interface which is taken out of the blocking state if appropriate. Recommended Action No user action is required. Error Message STP-2-PVSTSIM_FAIL: Blocking [chars] port [chars]: Inconsistent [chars] PVST BPDU received on VLAN [dec], claiming root [chars] Explanation When a MST switch is connected to a PVST+ switch, the CIST (MST00) information on the port of the MST switch must be consistently better than all the PVST+ messages if the port is designated or consistently worse than all the PVST+ messages if the port is root. If this constraint is not respected, the port on the MST switch is blocked in order to prevent a potential bridging loop. Recommended Action When STP is converging after a new switch, or switch port is added to the topology, this condition may happen transiently. The port unblocks automatically in such cases. If the port remains blocked, identify the root bridge as reported in the message, and configure a worse or better priority for the VLAN spanning tree consistent with the CIST role on the port of the MST switch. There could be more inconsistencies than the message indicates, and the port will not recover until all such inconsistencies are cleared. If you cannot determine which other VLANs have inconsistencies, disable and reenable the port. This message will appear again and specify another VLAN with inconsistencies to be fixed. Repeat this process until all inconsistencies on all VLANs are cleared. Error Message STP-2-PVSTSIM_OK: PVST Simulation inconsistency cleared on port [chars]. Explanation The listed interface is no longer receiving PVST BPDUs advertising an information inconsistent with the CIST port information. The PVST Simulation Inconsistency is cleared and the interface returns to normal operation. Recommended Action No user action is required. OL-15994-03 Cisco NX-OS System Messages Reference 2-621