Cisco Router/Switch monitoring link

How can a uplink L3 connection be monitored to ensure that the link is alive.   If a media Converter or hub/switch was inline between one L3 device and another, there would be no physical way to determine if the link was down

I have been told that Cisco IP SLA could be configured to track the link by sending IP PING packets to the upstream device.
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unfragmentedConnect With a Mentor Commented:
If its L3, and you're using a routing protocol, the protocol would normally detect a failed link by loss of hello packets.

If not L3 or using static routing, IPSLA or possible UDLD are your options.
Yes, you could use IP SLA since the device isn't directly connected to the downstream device.
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