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Related Documentation

Advanced Options

Figure 102: Advanced Options

Advanced Options

Fast Reroute Options

(Router networks only): See the Fast Reroute chapter of the Router Feature Guide for IP/MPLSView for more information.

Note: The Fast Reroute feature requires a license. Contact your Juniper Networks representative for assistance and further information.

Replay Up-Down Sequence

Use a custom failure simulation script. The file name of the script must be specified. An example of a custom failure simulation script is provided below:

Link1 down
Link2 down
RESET
Link3 down
Link4 down
RESET LINK
Link5 down
Link6 down
WAIT
Node1 down
Node2 down
RESET

Before you run an up-down sequence simulation, you must first specify whether to simulate Every Event or to simulate When WAIT/RESET is Encountered. Assuming the latter, in the above example, Link1 and Link2 is brought down first.

At the RESET line, the program will attempt to route all unplaced demands in the network (and generate the appropriate reports), after which all links are brought back up and all demands are placed back in their original paths. The program will then fail Link3 and Link4. Upon seeing the RESET LINK line, the program will again attempt to route all affected and unplaced demands in the network (and append the appropriate reports), after which all links are brought back up.

However, this time, the demands will not be placed back in their original paths; instead, the demands will remain routed according to the paths found while Link3 and Link4 were down. The program will then go on to fail Link5 and Link6. At the WAIT line, the program will attempt to route all unplaced demands (and append the appropriate reports), but will not bring up any links afterwards. Node1 and Node2 are then failed, and at the next RESET line the program will attempt to route all unplaced demands in the network while Link5, Link6, Node1, and Node2 are all down (and append the appropriate reports), after which all links and nodes are brought back up and all demands are assigned to their original paths.

After the program has finished running through the script, you may view the appropriate failure simulation reports for information recorded at each of the RESET, RESET LINK, and WAIT lines.

If you choose to simulate Every Event, then the program will run a simulation after every network failure. In the above example, Link1 is taken down first, and the unplaced demands are rerouted and the appropriate reports generated. Then, Link2 is taken down (Link1 is still down) and the unplaced demands are rerouted. When RESET is encountered, all links are brought back up and all demands are placed back in their original paths.

Related Documentation

Modified: 2017-04-04