Check the health of interfaces
In any network troubleshooting scenario it is always wise to investigate the health of Layer 1 as a first step in the process. It is useful to check for recent interface changes, the current link state, and errors or drops on the suspect interface.
- If the problem is not currently ongoing then document the time that it occurred.
- Check the current interface state: Use the
- Check the interface counters and statistics: Use the
show interfaces extensiveand look for increasing errors or drops.
- Examine the interface details in depth, as appropriate to the deployment scenario. For example:
show interface dataplane dp0s4;
show interface switch sw0a.