connectivity with 4331 and 3850

olivier leclerc · ‎06-21-2017

I have a 4331 with a 1 gig MM SFP in gig 0/0/2 connected to a 3850 c3850-nm-2-10G 1 gig MM SFP module.

no config, on either end but the default. I get a link light on the 3850 but not on the 4331.

Reza Sharifi · ‎06-21-2017

Can you try connecting to the other SFP port and make sure the media type is sfp under the interface?

HTH

olivier leclerc · ‎06-21-2017

The interface comes up fine.

Router#sho ip int brief
Interface              IP-Address      OK? Method Status                Protocol
GigabitEthernet0/0/0   unassigned      YES unset up                    up
GigabitEthernet0/0/1   unassigned      YES unset administratively down down
GigabitEthernet0/0/2   unassigned      YES unset down                  down
GigabitEthernet0       unassigned      YES unset administratively down down
Router#
Router#sho run int gig 0/0/0
Building configuration...

Current configuration : 87 bytes
!
interface GigabitEthernet0/0/0
no ip address
media-type sfp
negotiation auto

switch#

....

GigabitEthernet1/1/1 unassigned YES unset up up

interface GigabitEthernet1/1/1
end

olivier leclerc · ‎06-22-2017

Once I ran the command "service unsupported-transceiver" gig 0/0/2 started working even tho this is a cisco SFP that worked in gig 0/0/0.