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STP usually does a good job of avoiding loops, although there are cases where it fails STP can fail if bridges don't receive BPDUs consistently Usually the cause of inconsistent BPDU reception is a configuration error or a physical layer problem The best advice regarding troubleshooting STP is to check first for the kinds of data link and physical layer problems that previous chapters have described For example, BPDUs cannot be received correctly on an Ethernet link that has a duplex or speed mismatch or a high level of frame corruption 3 discusses Ethernet errors Consider the problems that result when a bridge port that is hard-coded for full duplex is connected to a port on another bridge that is hard-coded for half duplex A port configured for full duplex does not perform carrier sense when accessing the link.

A Head request is similar to a Get except that the data are not included in the response. It is really a request for the headers that would have been associated with the requested data; these headers might include content size or some other information that the client needs to check.

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The port sends frames even if the other side is already using the link The port on the other side of the link detects a collision and runs the backoff algorithm before attempting another transmission of its frame If there is enough traffic, the result may be that all frames (including BPDUs) sent by the half duplex port are deferred and eventually dropped From an STP point of view, because the other switch port is not receiving BPDUs, it misunderstands the spanning tree and unblocks ports that should be blocked, creating a loop Another cause for the inconsistent sending and receiving of BPDUs can be a switch that is so overloaded that it can't participate in the STP process correctly Because STP is not very complicated, this problem is rare, but it can happen, especially on a switch with many VLANs and the Cisco perVLAN spanning tree feature enabled.

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Use the show processes cpu command on Cisco IOS switches to check that a switch is not running low on CPU resources The CPU utilization should be under about 80 percent On a CatOS switch, look for the field RsrcErrors (resource errors) in the output of a show inband command (On some CatOS switches, use the show biga command) The resource error counter is incremented when the processor is too overloaded to perform some of its tasks If you suspect an unresolved loop on your network due to the inconsistent sending or receiving of BPDUs, use an analyzer to check traffic When there is a loop, you will see much more traffic than normal, especially broadcast traffic You can also use the show mac or show interface Cisco commands to check for overutilized switch ports.

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