Dell Force10 S55T S55 Configuration Guide FTOS 8.3.5.3 - Page 441
Displaying BPDUs and Events, MSTP Region Name and Revision
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Figure 22-14. Displaying BPDUs and Events Force10#debug spanning-tree mstp bpdu 1w1d17h : MSTP: Sending BPDU on Gi 1/31 : ProtId: 0, Ver: 3, Bpdu Type: MSTP, Flags 0x68 CIST Root Bridge Id: 32768:0001.e806.953e, Ext Path Cost: 20000 Regional Bridge Id: 32768:0001.e809.c24a, CIST Port Id: 128:384 Msg Age: 2, Max Age: 20, Hello: 2, Fwd Delay: 15, Ver1 Len: 0, Ver3 Len: 96 Name: my-mstp-region, Rev: 0, Int Root Path Cost: 20000 Rem Hops: 19, Bridge Id: 32768:0001.e80d.b6d6 E1200#1w1d17h : INST 1: Flags: 0x28, Reg Root: 32768:0001.e809.c24a, Int Root Co Brg/Port Prio: 32768/128, Rem Hops: 19 INST 2: Flags: 0x68, Reg Root: 4096:0001.e809.c24a, Int Root Cost: 20000 Brg/Port Prio: 32768/128, Rem Hops: 19 [output omitted] Force10#debug spanning-tree mstp events 1w1d17h : MSTP: TC flag set in the incoming BPDU on port Gi 1/31 for instance 0 1w1d17h : MSTP: TC flag set in the incoming BPDU on port Gi 1/31 for instance 0 1w1d17h : MSTP: TC flag set in the incoming BPDU on port Gi 1/31 for instance 0 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 (output sample shown in Figure 22-15). Use the debug spanning-tree mstp bpdu command to monitor and verify that the MSTP configuration is connected and communicating as desired (output sample shown in Figure 22-16). Key items to look for in the debug report: • MSTP flags indicate communication received from the same region. • In Figure 22-16, 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" (Figure 22-17)? 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. Multiple Spanning Tree Protocol | 441