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Use Show Interface Command
Show Interface is
very useful command. The show interface
display statistics for all interfaces configured on the router
or switch. This article is based on the below example.
1. To show one
interface only, use show interface "interface" as example
sh interfaces s0/0/1:0.
2. It should give
you some hardware information. In our case Circuit # is
DHZA045978 which your ISP may need
it.
3. For
troubleshooting, you my check any errors. In our case, you can
see 7706 input errors.
4. Other useful
information such as MTU, txload, reload, input rate and output
rate.
chicagotech#sh interfaces s0/0/1:0
Serial0/0/1:0 is up, line protocol is up
Hardware is GT96K Serial
Description: SOIB25 - S5/0/3/24:0 --> chicagotech -
DHZA045978
MTU 1500 bytes, BW 1536 Kbit, DLY
20000 usec,
reliability 255/255, txload 7/255, rxload
34/255
Encapsulation PPP, LCP Open, multilink Open
Link is a member of Multilink bundle Multilink15, loopback not
set
Keepalive set (10 sec)
Last input 00:00:00, output 00:00:00, output hang never
Last clearing of "show interface" counters 1d23h
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output
drops: 11
Queueing strategy: weighted fair [suspended, using FIFO]
FIFO output queue 0/40, 11 drops
5 minute input rate 207000 bits/sec, 41
packets/sec
5 minute output rate 45000 bits/sec, 27 packets/sec
7707627 packets input, 436418504 bytes, 0 no buffer
Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
7706 input errors, 7705 CRC, 6000
frame, 1890 overrun, 0 ignored, 3460 abort
6223226 packets output, 1981850750 bytes, 0 underruns
0 output errors, 0 collisions, 1 interface resets
0 output buffer failures, 0 output buffers swapped out
0 carrier transitions
Timeslot(s) Used:1-24, SCC: 1, Transmitter delay is 0 flags
chicagotech#
5. show
interfaces trunk shows interface trunk information
ADM_TELE_1ST_3750#show interfaces trunk
Port Mode Encapsulation Status Native vlan
Gi1/0/25 on 802.1q trunking 1
Port Vlans allowed on trunk
Gi1/0/25 1-4094
Port Vlans allowed and active in management domain
Gi1/0/25 1,4,100,200,254-256,300,400,500,600,700,800,900
Port Vlans in spanning tree forwarding state and not pruned
Gi1/0/25 1,4,100,200,254-256,300,400,500,600,700,800,900
6. show
interfaces switchport shows interface switchport information
ADM_TELE_1ST_3750#show interfaces g1/0/2 switchport
Name: Gi1/0/2
Switchport: Enabled
Administrative Mode: static access
Operational Mode: static access
Administrative Trunking Encapsulation: negotiate
Operational Trunking Encapsulation: native
Negotiation of Trunking: Off
Access Mode VLAN: 1 (default)
Trunking Native Mode VLAN: 1 (default)
Voice VLAN: none
Administrative private-vlan host-association: none
Administrative private-vlan mapping: none
Administrative private-vlan trunk native VLAN: none
Administrative private-vlan trunk encapsulation: dot1q
Administrative private-vlan trunk normal VLANs: none
Administrative private-vlan trunk private VLANs: none
Operational private-vlan: none
Trunking VLANs Enabled: ALL
Pruning VLANs Enabled: 2-1001
Capture Mode Disabled
Capture VLANs Allowed: ALL
Protected: false
Unknown unicast blocked: disabled
Unknown multicast blocked: disabled
Appliance trust: none
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