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Ensuring That Secondary Paths Establish When Resources Are Diminished

 

The Junos OS does not require that a primary and secondary path share the same parameters. You may decide to configure your primary paths with strict resource requirements, and configure your secondary paths with less strict requirements, allowing your secondary paths to establish more readily during periods of diminished resources.

Action

To ensure that secondary paths establish when resources are diminished, follow these steps:

  1. In configuration mode, go to the following hierarchy level:

    For example:

  2. Configure the bandwidth for the primary path, and do not configure any bandwidth for the secondary path:

    For example:

  3. Verify and commit the configuration:

Sample Output

The sample output below illustrates a bandwidth configuration on ingress router R1.

Meaning

The sample output shows the primary path via-r2 requires 35 Mbps of bandwidth, while secondary path via-r7 has no constraints. The primary path is configured with strict resource requirements, while the secondary path is configured with no bandwidth requirements, allowing the secondary path to establish more readily during periods of diminished resources. One thing to keep in mind when configuring a secondary path without bandwidth requirements is that it can be subject to traffic loss due to congestion.