Validate Your Spanning Tree Design with SuzieQ Checks, Assertions, and Topology Maps
Who is the root bridge for each VLAN or MST instance? Is it the switch you intended? Are bridge priorities, STP protocols, and port protections consistent with your design?
Looking at each switch individually and piecing together the network-wide picture takes time. SuzieQ’s normalized STP data brings that information together so you can validate intent, identify inconsistencies, and understand the topology.
Ask the operational questions that matter
Query the STP table through the CLI, GUI, REST API, or MCP, or incorporate its data into assertions and Complex Queries.
Root placement and priorities
- Which switch is root for each VLAN or MST instance?
- Does the observed root match the approved design?
- Do switches within the same STP domain agree on the root?
- Are bridge priorities correct for the intended primary, secondary, and access-layer switches?
- Could an access switch’s priority allow it to displace the intended root?
- Has root ownership changed since the last observation or maintenance window?
Priority validation requires interpreting bridgeId, since SuzieQ’s STP table does not
expose a separate bridge-priority field.
Protocols and port behavior
- Are switches running the intended STP protocol?
- Are the expected VLANs or MST instances present?
- Do endpoint-facing ports have the required BPDU Guard and edge settings?
- Which ports report STP inconsistencies?
- Are root, designated, and alternate ports where you expect them?
- Do port costs, port priorities, and timers match the design?
Make the checks repeatable
Use assertions to compare observed state with approved expectations.
- The intended switch is root for each domain and instance.
- Bridge priorities and STP protocols match the design.
- Endpoint-facing ports have the required protections.
- No ports report unexpected STP inconsistencies.
- Port roles, costs, and priorities match the intended forwarding topology.
Scope these checks to the actual STP domain. Separate Layer 2 islands can legitimately have different roots for the same VLAN number.
See the spanning tree on a map
A topology view makes the relationships easier to understand. For a selected VLAN or MST instance, highlight the root bridge, display port roles and states, distinguish forwarding paths from alternate paths, and flag inconsistencies.
The STP table supplies those attributes. Correlating them with neighbor or topology data supplies the physical connections. SuzieQ Enterprise’s on-demand topology capabilities provide a foundation for this network-wide view.
Verify protection as well as root placement
An unexpected switch becoming root is something you want to prevent, not merely discover afterward.
SuzieQ can validate observed root placement, bridge priorities, and exposed protection settings. Enforcement still belongs on the switches. The STP table includes BPDU Guard but not Root Guard, so it cannot independently verify every root-protection control.
Together, topology maps and repeatable assertions help you verify that the environment is operating as designed before and after a change. By checking root placement, protocol consistency, and port protections, you can uncover unexpected behavior and address it before it impacts users.