how to enable a SFP port for full duplex via the console on a Catalyst 3570G

[MichaelMarinesi1284]

hi new to the forums, 

I recently purchased a Cisco Catalyst 3570G. 

all of the Ethernet ports have been enabled successfully. however i cannot seem to find the correct commands to enable the SFP ports for full duplex. 

SFP port 49: from router

SFP port 50: PowerEdge R815

SFP port 51: PowerEdge 2950

i was under the impression that the the command to tell the SFP what to do is "duplex full" via the console once the desired SFP port is chosen. 

any help would be greatly appreciated.  

[Leo Laohoo]

SFP ports are ALWAYS full duplex.

[wesleyribeiro]

You have to access the interface of each port in specific to apply the necessary command
Switch # conf t
Enter configuration commands, one per line. End with CNTL / Z.
Switch (config) #
Switch (config) #interfac
Switch (config) #interface fas
Switch (config) #interface fastEthernet 1/1
Switch (config-if) #du
Switch (config-if) #duplex full
Switch (config-if) #duplex full
Switch (config-if) #
Switch#sh interface status
Port Name Status Vlan Duplex Speed Type
Fa1 / 1 notconnect 1 full auto 10 / 100BaseTX

[Leo Laohoo]

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@wesleyribeiro wrote:

You have to access the interface of each port in specific to apply the necessary command
Fa1 / 1 notconnect 1 full auto 10 / 100BaseTX

---

This is not correct. 

The question is duplex settings for SFP ports.  The example you've just provided is a copper port. 
Speed/Duplex settings can be configured for copper ports but not possible with SFP ports.

[wesleyribeiro]

Strange because I configure the port in whatever way is necessary, at least in the equipment that work both RJ-45 and SFP -Everyone starts business as auto - or I can get it wrong on your part

Gi1/0/48 notconnect 801 auto auto 10/100/1000BaseTX
Gi1/0/49 connected trunk a-full a-1000 1000BaseSX SFP
Gi1/0/50 notconnect trunk auto auto Not Present

[MichaelMarinesi1284]

I am using the correct sfps because the link light is green however the
link light only turns green when i run it from another switch. Even using
the same sfp config on my server dell r710 wont light it up. Even after I
reenable the port in the console it still dosent turn on. It sees the SFP
but does not send or receive traffic, while all my there switches see the
server just fine via sfps.
So the cisco switch will connect via sfp lc fiber to other switches but not
to my server.