What do TTL values 255, 254, and 253 mean in a BFD session

The TTL values 255, 254, and 253 indicate that the lifetime of a BFD packet is 255, 254, and 253 respectively.

From V200R001C01, you can configure a global TTL for a BFD session.

By default, the lifetime of a static single-hop or dynamic single-hop BFD packet is 255, the lifetime of a static multi-hop BFD packet is 254, and the lifetime of a dynamic multi-hop BFD packet is 253.

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