CHAPTER 8
Troubleshooting STP
This chapter contains the following sections:
•
About Troubleshooting STP, page 55
•
Initial Troubleshooting STP Checklist, page 55
•
Troubleshooting STP Data Loops, page 56
•
Troubleshooting Excessive Packet Flooding, page 59
•
Troubleshooting Convergence Time Issues, page 60
•
Securing the Network Against Forwarding Loops, page 60
About Troubleshooting STP
STP provides a loop-free network at the Layer 2 level. Layer 2 LAN ports send and receive STP frames at
regular intervals. Network devices do not forward these frames but use the frames to construct a loop-free
path. For more information on Layer 2, see the Cisco Nexus 9000 Series Layer 2 Configuration Guide.
Initial Troubleshooting STP Checklist
Troubleshooting an STP problem involves gathering information about the configuration and connectivity of
individual devices and the entire network.
Begin troubleshooting STP issues by checking the following issues first:
DoneChecklist
Verify the type of spanning tree configured on your device.
Verify the network topology including all interconnected ports and switches. Identify all
redundant paths on the network and verify that the redundant paths are blocking.
Cisco Nexus 9000 Series NX-OS Troubleshooting Guide, Release 7.x
55
To Next Page
Loading...
