First off I'm trying to determine from logs based on currently configured reachability SLAs if an outage is from our ISP, or if it's from the tunnel/endpoint itself. We have an Amazon DX tunnel interface configured as:
IP: 100.64.#.#
Source: 192.#.#.# (Amazon block, also configured as a loopback address)
Destination: 52.#.#.# (tunnel endpoint)
The SLA echoes tracked in config are approx a half dozen for each the interface IP (100.64.#.#) and the source (192.#.#.#). Any time the echoes from the IP (100.64.#.#) fail, the router assumes the tunnel is down and forwards everything to our secondary router. But I guess my question is under what conditions would the echoes from the source (192.#.#.#) fail but not the 100.64.#.# IP?
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