Cisco 2960XR SFP+ 1G help needed

[tonycarr69]

Hi, I have a new 2960XR switch (48 1G copper ports and 2 Ten Gig SFP+ ports).  I need to configure uplink ports to a exiting switch using 1G fibre (multimode).  Im using a 1G fibre SFP inserted in the Ten Gig SFP+ port.  This appears to dynamically create a new port number Gi1/0/49 and I still have the original Ten1/0/1.

I'm assuming that all the configuration needs to be applied to this new port number Gi1/0/49.  Can anyone confirm or point to some documentation that explains this.

The switch is 300 miles away with no remote access and I need to document the change process before going to site.

[chrihussey]

Yes that is correct. I have a C2960S-48FPD and it exhibits the same behavior. With an SFP+ in it shows Te1/0/1, with an SFP it shows Gi1/0/49.

SFP:

Gi1/0/48  capgal-floor4-sw1  connected    trunk      a-full a-1000 10/100/1000BaseTX
Gi1/0/49                     notconnect   230          auto   auto 1000BaseSX SFP
Te1/0/2   9300-eval          connected    trunk        full    10G SFP-10GBase-SR

SFP+:

Gi1/0/48  capgal-floor4-sw1  connected    trunk      a-full a-1000 10/100/1000BaseTX
Te1/0/1                      notconnect   1            full    10G SFP-10GBase-SR
Te1/0/2   9300-eval          connected    trunk        full    10G SFP-10GBase-SR

Also, here is a previous forum that deals with this issue:

https://community.cisco.com/t5/switching/understanding-additional-interfaces-on-stacked-switch-24-ports/td-p/2670181

Hope this helps

[pieterh · Accepted solution]

does this document answer your question

Port number—The interface number on the switch. The 10/100/1000 port numbers always begin at 1, starting with the far left port when facing the front of the switch, for example, gigabitethernet1/0/1 or gigabitethernet1/0/8. For a switch with 10/100/1000 ports and SFP module ports, SFP module ports are numbered consecutively following the 10/100/1000 ports.