Calculator
Enter hop metrics, define a threshold, compare against a reference path, and review route quality in one place.
Example Data Table
| Path | Style | Level | Hop Metrics | Threshold | Reference | Total |
|---|---|---|---|---|---|---|
| Core Path A | Wide | L2 | 10, 20, 15, 25 | 120 | 80 | 70 |
| Distribution Path B | Wide | L1/L2 | 12, 18, 14, 30, 22 | 140 | 90 | 96 |
| Campus Path C | Narrow | L1 | 8, 12, 10, 14 | 80 | 50 | 44 |
| Edge Path D | Narrow | L2 | 20, 15, 18 | 75 | 45 | 53 |
Formula Used
Total Path Metric = Sum of all entered segment metrics + external adjustment.
Average Per Hop = Total path metric / hop count.
Metric Spread = Highest hop metric - lowest hop metric.
Threshold Utilization = (Total path metric / threshold) × 100.
Headroom = Threshold - total path metric.
Balance Index = 100 - ((metric spread / average per hop) × 100).
Reference Alignment = 100 - ((|reference delta| / reference metric) × 100).
Quality Score = (Headroom Score × 0.50) + (Balance Index × 0.30) + (Reference Alignment × 0.20).
How to Use This Calculator
- Enter a path label for easier report tracking.
- Select narrow or wide metric style.
- Choose the IS-IS level for the evaluated route.
- Fill in each hop metric across the intended path.
- Add any external adjustment if you need overhead modeled.
- Set a threshold that marks your acceptable path ceiling.
- Enter a reference path metric for comparison.
- Click Analyze Metric to view summary results, per-hop buildup, and the Plotly graph.
- Use the export buttons to save CSV and PDF outputs.
Frequently Asked Questions
1. What does this calculator analyze?
It analyzes an IS-IS path by summing hop metrics, comparing the result with a threshold, measuring spread, and producing a route quality score.
2. Why enter a reference metric?
A reference metric gives the tool a baseline. It helps you see whether the studied path is cheaper, equal, or more expensive than another known path.
3. What is threshold utilization?
Threshold utilization shows how much of your defined metric budget the current path consumes. Lower percentages provide more room for growth or future tuning.
4. What does metric spread tell me?
Metric spread shows the distance between the largest and smallest hop values. A large spread often signals imbalance and may indicate tuning opportunities.
5. Can I leave some hop fields empty?
Yes. Empty fields are ignored. Only filled hop metrics are included in the path calculation, allowing short and long paths in one template.
6. Why is there an external adjustment field?
External adjustment lets you model added overhead or administrative cost after summing hop metrics. It is useful when comparing planned variations.
7. What does the quality score represent?
The quality score blends headroom, balance, and alignment with your reference path. Higher scores suggest a cleaner, safer, and more stable metric profile.
8. Can I export the report?
Yes. After analysis, you can export a CSV summary or a PDF report directly from the result section above the form.