Interface Status Codes and Reasons for Nonworking States
Lesson 2: Checking Interface Status
Cisco switches actually use two different sets of interface status codes—one set of two codes (words) that use the same conventions as do router interface status codes, and another set with a single code (word). Both sets of status codes can determine whether an interface is working.
The switch show interfaces and show interfaces description commands list the two-code status just like routers. The two codes are named the line status and protocol status. They generally refer to whether Layer 1 is working (line status) and whether Layer 2 is working (protocol ...
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