Supported Platforms
Computing Paths Offline
The Junos OS provides online, real-time CSPF computation only; each router performs CSPF calculations independent of the other routers in the network. These calculations are based on currently available topology information—information that is usually recent, but not completely accurate. LSP placements are locally optimized, based on current network status.
To optimize links globally across the network, you can use an offline tool to perform the CSPF calculations and determine the paths for the LSPs. You can create such a tool yourself, or you can modify an existing network design tool to perform these calculations. You should run the tool periodically (daily or weekly) and download the results into the router. An offline tool should take the following into account when performing the optimized calculations:
- All the LSP’s requirements
- All link attributes
- Complete network topology
