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.
sectelAsked:
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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.
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SouljaCommented:
Yes, you could use IP SLA since the device isn't directly connected to the downstream device.
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