Dell MX5108n OS10 Enterprise Edition User Guide for PowerEdge MX IO Modules Re - Page 218
Debug configurations, MST commands, configurations
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Boundary: NO bpdu filter : bpdu guard : bpduguard shutdown-on- violation :disable RootGuard: disable LoopGuard enable Bpdus (MRecords) sent 7, received 20 Interface Designated Name PortID Prio Cost Sts Cost Bridge ID PortID ethernet1/1/4 128.272 128 500 FWD 0 32769 90b1.1cf4.9d3b 128.272 Root guard OS10(conf-if-eth1/1/4)# spanning-tree guard root OS10(conf-if-eth1/1/4)# do show spanning-tree interface ethernet 1/1/4 ethernet1/1/4 of vlan1 is root Forwarding Edge port:no (default) port guard :none (default) Link type is point-to-point (auto) Boundary: NO bpdu filter : bpdu guard : bpduguard shutdown-on- violation :disable RootGuard: enable LoopGuard disable Bpdus (MRecords) sent 7, received 33 Interface Designated Name PortID Prio Cost Sts Cost Bridge ID PortID ethernet1/1/4 128.272 128 500 BLK 500 32769 90b1.1cf4.a911 128.272 Debug configurations Use the debug spanning-tree bpdu command to monitor and verify that the MST configuration is communicating as configured. To ensure all necessary parameters match - region name, region version, and VLAN to instance mapping - examine your individual devices. Use the show spanning-tree mst command to view the MST configuration, or use the show running-configuration command to view the overall MST configuration. MST flags for communication received from same region MST region name and revision MST instances The MST routers are located in the same region. If the debug logs indicate that packets are coming from a Different Region, one of the key parameters does not match. The configured name and revisions must be identical among all devices. If the region name is blank, a name was configured on one device and was not configured or was configured differently on another - spelling and capitalization counts. Verify the VLAN to MST instance mapping using the show commands. If you see extra MST instances in the Sending or Received logs, an additional MST instance was configured on one router but not others. • View BPDUs in EXEC mode. debug spanning-tree bpdu • View MST-triggered topology change messages in EXEC mode. debug spanning-tree events View MST configuration OS10# show spanning-tree mst configuration Region Name: force10 Revision: 100 MSTI VID 0 1,31-4093 1 2-10 2 11-20 3 21-30 MST commands 218 Layer 2