The most fundamental fault detection for Ethernet interfaces is the same as that for any system interface—whether the interface is operational or not. Changes in interface state trigger linkUp or linkDown traps. You may also monitor ifOperStatus. For further details, on this type of fault monitoring, please refer to the section on system interfaces in Chapter 12, “Monitoring System Interfaces.” The rest of this section discusses Ethernet-specific fault management.
Ethernet errors come in a variety of flavors, but all represent a framing error of some sort. There is either an FCS error or the frame is too short or too long. Following are the basic Ethernet errors and a brief explanation of each:
CRC or FCS errors The Frame ...