Cisco Commands – Different Serial Numbers from ‘Show Version’ and ‘Show Inventory’

cdpciscocisco-commands

Once I'm connected via telnet to certain CISCO equipment I type "Show inventory" and I get to something like this:

Barragan_3750>show inventory
NAME: "1", DESCR: "WS-C3750G-12S"
PID: WS-C3750G-12S-E   , VID: V06, SN: FDO1129Z9ZJ

NAME: "GigabitEthernet1/0/1", DESCR: "1000BaseLX SFP"
PID:                     , VID:    , SN: H006K022        

NAME: "GigabitEthernet1/0/2", DESCR: "10/100/1000BaseTX SFP"
PID: GLC-T               , VID:    , SN: 00000MTC1444080Z

NAME: "GigabitEthernet1/0/3", DESCR: "1000BaseLX SFP"
PID:                     , VID:    , SN: H006K083        

NAME: "GigabitEthernet1/0/4", DESCR: "1000BaseLX SFP"
PID:                     , VID:    , SN: H006K021        

NAME: "GigabitEthernet1/0/5", DESCR: "1000BaseSX SFP"
PID:                     , VID:    , SN: FNS11190FLE     

NAME: "GigabitEthernet1/0/6", DESCR: "1000BaseSX SFP"
PID:                     , VID:    , SN: P7K08UQ         

NAME: "GigabitEthernet1/0/7", DESCR: "1000BaseLX SFP"
PID:                     , VID:    , SN: H006K032        

NAME: "GigabitEthernet1/0/8", DESCR: "1000BaseLX SFP"
PID:                     , VID:    , SN: H006K040        

NAME: "GigabitEthernet1/0/9", DESCR: "1000BaseLX SFP"
PID:                     , VID:    , SN: FNS14420533     

NAME: "GigabitEthernet1/0/10", DESCR: "1000BaseLX SFP"
PID: GLC-LH-SMD          , VID: V86, SN: FNS16361SG0     

NAME: "GigabitEthernet1/0/11", DESCR: "1000BaseLX SFP"
PID: GLC-LH-SMD          , VID: V86, SN: FNS174002FT     

NAME: "GigabitEthernet1/0/12", DESCR: "1000BaseLX SFP"
PID: GLC-LH-SMD          , VID: V86, SN: FNS183503FS

Let's take this entry for the example:

NAME: "GigabitEthernet1/0/9", DESCR: "1000BaseLX SFP"
PID:                     , VID:    , SN: FNS14420533

If I type "show cdp neighbors detail " this is showed:

Device ID: Arquitectura_Salones
Entry address(es): 
  IP address: 148.228.000.85
Platform: cisco WS-C2960S-48TS-S,  Capabilities: Switch IGMP 
Interface: GigabitEthernet1/0/9,  Port ID (outgoing port): GigabitEthernet0/49
Holdtime : 157 sec

Now we know that I have Arquitectura_Salones connected at GigabitEthernet1/0/9, it's serial number is: FNS14420533 and the IP is: 148.228.000.85

If I connect via telnet to this equipment and type "show version" this information is showed:

Base ethernet MAC Address       : 00:23:05:46:8B:00
Motherboard assembly number     : 73-9835-09
Power supply part number        : 341-0097-02
Motherboard serial number       : FOC12351HVZ
Power supply serial number      : AZS123206WY
Model revision number           : F0
Motherboard revision number     : A0
Model number                    : WS-C2960-48TC-L
System serial number            : FOC1235Z1W5
Top Assembly Part Number        : 800-26672-04
Top Assembly Revision Number    : A0
Version ID                      : V04
CLEI Code Number                : COM3F00BRC
Hardware Board Revision Number  : 0x02

As you can see, the serial number is different.

How can I know which is the correct one?

Best Answer

Show inventory is for local information only. You are finding the serial number of the 1000BaseLX SFP optic in Gi1/0/9 with this output.

The show inventory and show version on the 2960 should match. Be aware that sometimes the mainboard serial number is sometimes shown with the same description as the device, so double-checking between the inventory and version outputs is recommended.

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