Using the "display interface brief" Command to View Interface Status and Utilization
The article explains how to use the 'display interface brief' command to view interface status, interpret various state symbols, read input/output utilization percentages, and calculate actual traffic rates for each interface on a network device.
Users can run the display interface brief command to obtain a concise overview of each interface's operational state and configuration on the device.
The output includes status symbols where down indicates administratively down, (l) denotes loopback, (s) spoofing, (E) E‑Trunk down, (b) BFD down, (e) ETHOAM down, (dl) DLDP down, and (d) Dampening suppressed.
Sample output (shown as plain text):
Interface PHY Protocol InUti OutUti
GigabitEthernet0/0/1 up up 0.06% 100%
GigabitEthernet0/0/2 up up 100% 100%
GigabitEthernet0/0/3 up up 0% 100%
GigabitEthernet0/0/4 up up 10% 10%
GigabitEthernet0/0/5 up up 32% 25%
GigabitEthernet0/0/6 down down 0% 0%
... (remaining interfaces omitted for brevity) ...
NULL0 up up(s) 0% 0%The columns InUti and OutUti represent the average bandwidth utilization over the last 300 seconds for inbound and outbound traffic, respectively. Traffic volume can be calculated as Interface Rate × Utilization. For example, GigabitEthernet0/0/5 (1 Gbit/s) with 32 % inbound and 25 % outbound utilization yields approximately 320 Mbit/s inbound and 250 Mbit/s outbound traffic.
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