Dell Force10 E600i FTOS Version 8.4.1.5 Configuration Guide for ExaScale - Page 630
Sample Output for, command, Displaying BPDUs and Events - Debug Log of Successful MSTP Configuration
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www.dell.com | support.dell.com Examine your individual routers to ensure all the necessary parameters match. 1. Region Name 2. Region Version 3. VLAN to Instance mapping The show spanning-tree mst commands will show various portions of the MSTP configuration. To view the overall MSTP configuration on the router, use the show running-configuration spanning-tree mstp in the EXEC Privilege mode (refer to Sample Output for show running-configuration spanning-tree mstp command). Use the debug spanning-tree mstp bpdu command to monitor and verify that the MSTP configuration is connected and communicating as desired (refer to Displaying BPDUs and Events - Debug Log of Successful MSTP Configuration). Key items to look for in the debug report: • MSTP flags indicate communication received from the same region. • In Displaying BPDUs and Events - Debug Log of Successful MSTP Configuration, the output shows that the MSTP routers are located in the same region. • Does the debug log indicate that packets are coming from a "Different Region" (refer to Displaying BPDUs and Events - Debug Log of Unsuccessful MSTP Configuration)? If so, one of the key parameters is not matching. • MSTP Region Name and Revision • The configured name and revisions must be identical among all the routers. • Is the Region name blank? That may mean that a name was configured on one router and but was not configured or was configured differently on another router (spelling and capitalization counts). • MSTP Instances. • Use the show commands to verify the VLAN to MSTP Instance mapping. • Are there "extra" MSTP Instances in the Sending or Received logs? That may mean that an additional MSTP Instance was configured on one router but not the others. Sample Output for show running-configuration spanning-tree mstp command FTOS#show run spanning-tree mstp ! protocol spanning-tree mstp name Tahiti revision 123 MSTI 1 VLAN 100 MSTI 2 VLAN 200,300 Displaying BPDUs and Events - Debug Log of Successful MSTP Configuration FTOS#debug spanning-tree mstp bpdu MSTP debug bpdu is ON Force10# 4w0d4h : MSTP: Sending BPDU on Gi 2/21 : ProtId: 0, Ver: 3, Bpdu Type: MSTP, Flags 0x6e CIST Root Bridge Id: 32768:0001.e806.953e, Ext Path Cost: 0 630 | Multiple Spanning Tree Protocol
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