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Visualizing & Analyzing

This is the heart of Topolograph: an interactive OSPF/IS-IS graph you can probe with the same algorithms the routers use. Everything below runs against your uploaded snapshot, so experiments never affect the production network.

Shortest paths

Pick a source and a destination node and Topolograph builds the shortest path tree between them, highlighting the path(s) and showing the total IGP cost.

Shortest path tree between two nodes

When multiple equal-cost paths exist, ECMP is shown explicitly so you can see where traffic load-balances.

Topology with ECMP paths

Backup paths

Topolograph doesn't just show the primary path — it computes the backup path the network would actually use if the primary failed, including secondary backups. This answers the question every change-window raises: "if this link goes, where does the traffic go?"

Backup shortest path tree

It also distinguishes backup paths that ride over ECMP from those that don't, which matters when you reason about capacity during a failure.

Simulating failures

Test "what if" without touching anything live.

Remove a link and Topolograph recomputes paths instantly, showing how traffic re-routes around it.

Network reaction to removing a link

You can see the result together with the affected statistics:

Network reaction to a removed edge, with stats

Shut a node

Take an entire router out and watch traffic flow around the failed node.

Network reaction to shutting a node

Result after shutting a node

Change an IGP metric on the fly and immediately see the effect on path selection — ideal for planning a maintenance, shifting traffic off a link, or validating a cost design before you push it.

Network reaction to an OSPF cost change

Network Heatmap

The Network Heatmap (under Analytics) reveals structural properties of the topology at a glance — which links and nodes carry the most paths, where your single points of failure are, and which networks have no backup path.

Network heatmap with networks

Filter to the networks that are not backed up to find exactly where a single failure would cause a loss of reachability:

Heatmap highlighting non-backed-up networks

Detecting asymmetric paths

Routing that takes one path forward and a different path back can complicate firewalls, QoS and troubleshooting. Topolograph's Analytics → Asymmetric paths report finds these pairs for you.

Analytics menu — asymmetric paths

A real asymmetric path example

Where to go next