Question on show ip interface brief

[wfqk]

Hi I used command show ip interface brief. and I got the following output. My question is why Port G1/20 has TFTP, while other ports have unset ?

Thank you

SW-(config)#do show ip interface brief

GigabitEthernet1/18    unassigned      YES unset  down                  down    
GigabitEthernet1/19    unassigned      YES unset  down                  down    
GigabitEthernet1/20    unassigned      YES TFTP   down                  down    
GigabitEthernet1/21    unassigned      YES unset  down                  down    

[Reza Sharifi]

Hi,

Can you post the output of "sh run int g1/20"

[wfqk]

Hi Thanks for your reply

SW-05#sh ip int bri | b 1/18
GigabitEthernet1/18    unassigned      YES unset  down                  down    
GigabitEthernet1/19    unassigned      YES unset  down                  down    
GigabitEthernet1/20    unassigned      YES TFTP   down                  down    
  

SW-05#sh run | b 1/18
interface GigabitEthernet1/18
 no ip address
!
interface GigabitEthernet1/19
 no ip address
!
interface GigabitEthernet1/20
 no ip address
!

[burleyman]

Hope this helps

Method

The method field has the following possible values:

•RARP or SLARP—Reverse Address Resolution Protocol (RARP) or Serial Line Address Resolution Protocol (SLARP) request

•BOOTP—Bootstrap protocol

•TFTP—Configuration file obtained from TFTP server

•manual—Manually changed by CLI command

•NVRAM—Configuration file in NVRAM

•IPCP—ip address negotiated command

•DHCP—ip address dhcp command

•unassigned—No IP address

•unset—Unset

•other—Unknown

Mike

[Reza Sharifi]

Hi,

Have a look at table-1 in this link.

It does not appear to be the case right now, but the configuration method for interface g1/20 was obtain by tftp server at one time.

If you reboot the router (warning downtime) that will probably change.

https://www.cisco.com/c/en/us/td/docs/optical/cpt/r9_5/command/reference/cpt95_cr/cpt95_cr_chapter_010001.pdf

HTH

[gothlzcisco]

If you had this interface configured at some point recently and then reset the configuration, you might see TFTP there.

If you put an IP address on that interface and reboot, you'll see it go to manual the next time you reboot.