Chapter 2. Message and Recovery Procedures 37
SPANTREE-7-BLOCK-PORT-TYPE: Blocking [chars] on [chars]. Inconsistent port type.
Explanation This message means that the listed interface is being held in the spanning-tree blocking
state until the port-type inconsistency is resolved. The first [chars] is the interface, and the second [chars]
is the spanning-tree instance.
Response Verify that the configuration and operational states of the listed interface and those of the
interface to which it is connected are in the same mode (access or trunk). If the mode is trunk, verify that
both interfaces have the same encapsulation (ISL or 802.1Q). When these parameters are consistent,
spanning tree automatically unblocks the interface.
SPANTREE-7-RECV-1Q-NON-TRUNK: Received 802.1Q BPDU on non trunk [chars] [chars].
Explanation This message means that an SSTP bridge protocol data units (BPDU) was received on the
listed interface, which is not an operational trunking interface. The first [chars] is the port name, and the
second [chars] is the VLAN name.
Response Verify that the configuration and operational state of the listed interface and that of the
interface to which it is connected are in the same mode (access or trunk). If the mode is trunk, verify that
both interfaces have the same encapsulation (none, ISL, or 802.1Q). When these parameters are
consistent, spanning tree automatically unblocks the interface.
SPANTREE_FAST-7-PORT_FWD_UPLINK: [chars] [chars] moved to Forwarding (UplinkFast).
Explanation This message means that the listed interface has been selected as the new root port for
the listed spanning-tree instance.
Response No action is required.
SPANTREE_VLAN_SW-2-MAX_INST ANCE: Platform limit of [dec] STP instances exceeded. No instance created for
[chars] (port [chars]).
Explanation This message means that the number of currently active VLAN spanning-tree instances
has reached a platform-specific limit. No additional VLAN instances will be created until the number of
existing instances drops below the platform limit. The message shows the smallest VLAN number of those
VLANs that are unable have STP instances created.
Response Reduce the number of currently active spanning-tree instances by either disabling some of
the currently active spanning-tree instances or by deleting the VLANs associated with currently active
spanning-tree instances. You need to manually enable the spanning trees that could not be created due
to limited STP instances.
SPANTREE-4-PORT_NOT_FORWARDING: ASSERT MINOR [char ] Port Not Forwarding.
Explanation This message means that the port is not forwarding packets; that is, it is not in a forwarding
state. [char] is the port.
Response Find out more about the error by using the show tech-support privileged EXEC command and
by copying the error message exactly as it appears on the console or system log and entering it in the Output
Interpreter tool. Use the Bug Toolkit to look for similar reported problems. For more information about these
online tools , see the “Error Message Traceback Reports” section on page 9.