L3 Failure Paths

Layer 3 paths can be private or internet paths, VPN, or standard VPNs. There is a Layer 3 failure on all other paths and there is no way to reach the WAN side destination optimally or sub-optimally.
A path that is configured in the Layer 3 failure paths list is considered only in the following conditions:
  • Condition 1
    • All active and backup paths are up and available, but Layer 3 is unreachable.
    • Layer 3 failure paths are configured and up.
    • At least one Layer 3 failure path is Layer 3 reachable.
  • Condition 2
    • All active and backup paths are down or routes on both paths do not exist. For example, direct on public-1 and public-1 do not exist.
    • Layer 3 failure paths are configured and are up.
  • Condition 3
    • Network asymmetry.

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