Cisco SFP and Port Commands

Dec 2019
I purchased some SFPs to go in to a Cisco 10GB switch, and found they did not work in my switch. While investigating the fault, I found some useful commands to help me.
These commands seem to work on both Cisco IOS and the Nexus switches, alebit with some slightly different syntax.

Show Inventory

Show Inventory - sh inventory displays information about the switch hardware options:

NAME: "Chassis", DESCR: "Nexus 3548 Chassis"
PID: N3K-C3548P-10G , VID: V02 , SN: FOC1822R0WS
NAME: "Module 1", DESCR: "48x10GE Supervisor"
PID: N3K-C3548P-10G , VID: V02 , SN: FOC18220S2A
NAME: "Fan 1", DESCR: "Chassis fan module"
PID: NXA-FAN-30CFM-F , VID: N/A , SN: N/A
NAME: "Fan 2", DESCR: "Chassis fan module"
PID: NXA-FAN-30CFM-F , VID: N/A , SN: N/A
NAME: "Fan 3", DESCR: "Chassis fan module"
PID: NXA-FAN-30CFM-F , VID: N/A , SN: N/A
NAME: "Fan 4", DESCR: "Chassis fan module"
PID: NXA-FAN-30CFM-F , VID: N/A , SN: N/A
NAME: "Power supply 1", DESCR: "AC power supply"
PID: N2200-PAC-400W , VID: V04 , SN: DTN1817P5GC
NAME: "Power supply 2", DESCR: "AC power supply"
PID: N2200-PAC-400W , VID: V04 , SN: DTN1817P5Q1

Show Interface

Show Interface displays detailed information about each interface. If you only issue the command sh interface (Nexus) (or sh interfaces for IOS) then you get information regarding all interfaces.
You can get information on a specific interface by using the Cisco syntax sh interface ethernet 1/1. In this example we get the information for port 1. Depending on your switch you might have to use ethernet or GigabitEthernet etc.

Ethernet1/1 is up
Dedicated Interface
Hardware: 100/1000/10000/40000 Ethernet, address: 88f0.31ca.b0c8 (bia 88f0.31c
a.b0c8)
MTU 1500 bytes, BW 10000000 Kbit, DLY 10 usec
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA
Port mode is access
full-duplex, 10 Gb/s, media type is 10G
Beacon is turned off
Input flow-control is off, output flow-control is off
Rate mode is dedicated
Switchport monitor is off
EtherType is 0x8100
Last link flapped 00:14:47
Last clearing of "show interface" counters never
5 interface resets
30 seconds input rate 24 bits/sec, 0 packets/sec
30 seconds output rate 296 bits/sec, 0 packets/sec
Load-Interval #2: 5 minute (300 seconds)
input rate 192 bps, 0 pps; output rate 360 bps, 0 pps
RX
0 unicast packets 115 multicast packets 34 broadcast packets
149 input packets 22045 bytes
0 jumbo packets 0 storm suppression bytes
0 runts 0 giants 0 CRC 0 no buffer
0 input error 0 short frame 0 overrun 0 underrun 0 ignored
0 watchdog 0 bad etype drop 0 bad proto drop 0 if down drop
0 input with dribble 0 input discard
0 Rx pause
TX
520 unicast packets 0 multicast packets 0 broadcast packets
520 output packets 49544 bytes
0 jumbo packets
0 output errors 0 collision 0 deferred 0 late collision
0 lost carrier 0 no carrier 0 babble 0 output discard
0 Tx pause