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Cisco NX-OS System Messages Reference
OL-15994-03
Chapter 2 System Messages and Recovery Procedures
STP Messages
STP-3
Error Message STP-3-BLOCK_PORT_TYPE: Blocking [chars] on [chars]. Inconsistent port
type.
Explanation The listed interface is being held in spanning tree blocking state until the port type
inconsistency is resolved.
Recommended Action Verify that the configuration and operational state of the listed interface and
that of the interface to which it is connected have the same mode (access vs trunk). If mode is trunk,
verify the same encapsulation (ISL, 802.1Q). Once these parameters are consistent, spanning tree
will automatically unblock the interfaces as appropriate.
Error Message STP-3-PORT_SELF_LOOPED: Received BPDU src mac same as that of port.
Port self loopback detected. Port [chars] being disabled
Explanation The source MAC address contained in a BPDU received on the listed interface matches
the MAC address assigned to that interface This indicates the possibility that a port is looped back
to itself, possibly due to a diagnostic cable being plugged in. The interface will be administratively
shutdown.
Recommended Action Check the interface configuration and any cable plugged into the interface.
Once the problem is resolved, re-enable interface by doing a no shutdown in the interface
configuration. Copy the error message as it is printed and also copy the output of a show interface
for the interface listed in the error message.
Error Message STP-3-RECV_1Q_NON_TRUNK: Received 802.1Q BPDU on non trunk [chars]
[chars].
Explanation A SSTP BPDU was received on the listed interface that was not operationally a trunk.
Recommended Action Verify that the configuration and operational state of the listed interface and
that of the interface to which it is connected have the same mode (access vs trunk). If mode is trunk,
verify the same encapsulation (none, ISL, 802.1Q). Once these parameters are consistent, spanning
tree will automatically unblock the interfaces as appropriate.
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