Not exactly sure of the context you are asking from but there are several ways - query the device using SNMP to report on state and statistics of the interface, setup the device to generate SNMP traps in the event of state change, monitor and act on syslog messages generated by the device. Those are just the most common of several ways.
I take it you want to verify confirmed end-end reachability of both sides of an Ethernet connection from the router itself. The usual approach is to use an external tools that looks at each end's characteristics and makes a conclusion based on that.
If you want something closer to the absolute truth then IP SLA and tunnel monitoring are good ones. Depending on the platform you may be able to use something like mediatrace as well. You can also leverage embedded event manager (EEM) to give you some insight.
We are pleased to announce availability of Beta software for 16.6.3.
16.6.3 will be the second rebuild on the 16.6 release train targeted
towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are
looking for early feedback from customers befor...
Introduction Featured Speakers Luis Espejel is the Telecommunications
Manager of IENova, an Oil & Gas company. Currently he works with Cisco
IOS® and Cisco IOS XE platforms, and NX to some extent. He has also
worked as a Senior Engineer with the Routing P...
In this session you can learn more about Layer 3 multicast and the best
practices to identify possible threats and take security measures. It
provides an overview of basic multicast, the best security practices for
use of this technology, and recommendati...