Friday, November 30, 2018

Question on IP SLA reachability for a tunnel interface source vs IP (Cisco ASR)

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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