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3-64

Multiple Instance Spanning-Tree Operation

Troubleshooting an MSTP Configuration

Displaying Debug Counters for One MST Instance

The show spanning-tree debug-counters instance command allows you to dis-

play the aggregate values of all MSTP debug counters maintained on a switch

for a specified spanning-tree instance. These aggregate values are a summary

of information collected from all ports that have VLANs assigned to the

specified instance.

Use the show spanning-tree debug-counters instance command to troubleshoot

the global MSTP diagnostic information displayed in show spanning-tree

debug-counters command output when you suspect unauthorized MSTP activ-

ity in a specific MST instance.

The following example shows sample output of the show spanning-tree debug-

counters instance command when applied to the Common and Internal Span-

ning Tree (CIST) instance (default MST instance 0) in the network. For a

description of each counter, refer to Table 3-1 on page 3-68.

Syntax: show spanning-tree debug-counters instance <instance-id>

This command displays debug counters for MSTP activity on

all ports configured for VLANs in the specified MST instance.

The valid values for instance <instance-id> are from 0 to 16:

• 0 specifies the default MST (CIST) instance.

• 1 to 16 specify a multiple spanning-tree (MST) instance.

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