Debugging And Verifying An Mstp Configuration - Dell Force10 MXL Blade Configuration Manual

Debugging and Verifying an MSTP Configuration

To display BPDUs, use the
(Figure 19-15). To display MSTP-triggered topology change messages, use the
command.
events
Figure 19-15. Displaying BPDUs and Events
FTOS#debug spanning-tree mstp
1w1d17h : MSTP: Sending BPDU on TenGig 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]
FTOS#debug spanning-tree mstp
1w1d17h : MSTP: TC flag set in the incoming BPDU on port TenGig 1/31 for instance 0
1w1d17h : MSTP: TC flag set in the incoming BPDU on port TenGig 1/31 for instance 0
1w1d17h : MSTP: TC flag set in the incoming BPDU on port TenGig 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
overall MSTP configuration on the router, use the
EXEC Privilege mode
To monitor and verify that the MSTP configuration is connected and communicating as desired, use the
debug spanning-tree mstp bpdu
Key items to look for in the debug report:
• MSTP flags indicate communication received from the same region.
• In Figure
• Does the debug log indicate that packets are coming from a "Different Region"
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).
debug spanning-tree mstp bpdu
bpdu
events
commands show various portions of the MSTP configuration. To view the
(Figure 19-16).
command (Figure
19-17, the output shows that the MSTP routers are located in the same region.
command from EXEC Privilege mode
show running-configuration spanning-tree mstp
19-17).
Multiple Spanning Tree Protocol (MSTP) | 351
debug spanning-tree mstp
command in
(Figure 19-18)? If