Fast Down Detection

Fast down detection or sub-second link failure detection is needed in a modern networks. Network operators of modern networks require that they can detect failure in sub-second and react to either soft or hard failures as quickly as possible. The following are the two categories of fast down detection. 1.

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MPLS VPN: Same OSPF Domain ID

On a Layer 3 MPLS VPN using OSPF as an IGP between PE and CE, OSPF domain ID is equivalent to the OSPF process ID by default. Therefore, OSPF routes are seen as OSPF inter-area (Type 3 OSPF LSA). By considering this behaviour, it is easy to distinguish real external

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