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CCNA Study Guide v2.71 – Aaron Balchunas
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All original material copyright © 2014 by
Aaron Balchunas (aaron@routeralley.com),
unless otherwise noted. All other material copyright © of their respective owners.
This material may be copied and used freely, but may not be altered or sold without the expressed written
consent of the owner of the above copyright. Updated material may be found at http://www.routeralley.com.
166
Status of Router Interfaces
To view the current status and configuration of all interfaces:
Router# show interfaces
Ethernet 0 is up, line protocol is up
Hardware is Ethernet, address is 5520.abcd.1111
Internet address is 192.168.1.1, subnet mask is 255.255.255.0
MTU 1500 bytes, BW 10000 Kbit, DLY 100000 usec, rely 255/255, load 1/255
Encapsulation ARPA, loopback not set, keepalive set (10 sec)
ARP type: ARPA, ARP Timeout 4:00:00
Last input 0:00:00, output 0:00:00, output hang never
Last clearing of “show interface” counters 0:00:00
Output queue 0/40, 0 drops; input queue 0/75, 0 drops
Five minute input rate 0 bits/sec, 0 packets/sec
Five minute output rate 2000 bits/sec, 4 packets/sec
53352 packets input, 351251 bytes, 0 no buffer
Received 4125 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
12142 packets output, 16039 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets, 0 restarts
Ethernet 1 is up, line protocol is up
Hardware is Ethernet, address is 5520.abcd.1112
<snip>
The show interfaces command displays a plethora of information, including:
• Current interface status (ethernet 0 is up, line protocol is up)
• MAC address (5520.abcd.1111)
• IP address (192.168.1.1)
• MTU (1500 bytes)
• Bandwidth (10 Mbps)
• Output and input queue status
• Traffic statistics (packets input, packets output, collisions, etc.)
To view the current status of a specific interface:
Router# show interfaces ethernet 0
To view only IP information for all interfaces:
Router# show ip interface brief
Interface IP Address OK? Method Status Protocol
Ethernet0 192.168.1.1 YES NVRAM up up
Ethernet1 192.168.2.1 YES NVRAM up up
Serial0 unassigned YES unset administratively down down