09-16-2008 04:56 PM - edited 03-06-2019 01:25 AM
Hi,
I'm trying to configure the GigabitEthernet interface of the WS-C2960 switch to have a full duplex. Unfortunately, there is no option to configure this neither is the speed of that interface. But these options are present in FastEthernet ports. Is there a bug in SW version 12.2(35)SE5 that explains this abnormality?
Thanks!
09-16-2008 05:05 PM
Gig is full duplex by default and generally do not have to hardcode speed and duplex on a gig port it will negotiate it by itself. What you are seeing is by design.
09-16-2008 05:10 PM
Hi,
Thanks for your reply. That is also my understanding. But how come when I check the status of the interface, the duplex is a-half even though the other port linked to it is configured as full duplex. Any thoughts on this?
Thanks!
09-17-2008 01:21 PM
Hi,
These details might help, the module inserted in the gig port is GLC-FE-100FX (100BaseFX-FE SFP). And a 100BaseFX on the other link, module type for this is WS-X4124-FX-MT. Do you think this will cause the gig port to be half duplex?
Thanks,
Patricia
06-28-2012 03:19 PM
On the 2960 switch the "dual purpose" uplinks need to be manually configured with "media-type" to be able to set speed/duplex. Default would not allow setting these 2 attributes.
interface GigabitEthernet0/1
switchport mode trunk
media-type rj45
speed 100
duplex full
end
GigabitEthernet0/1 is down, line protocol is down (notconnect)
Hardware is Gigabit Ethernet, address is
Description: Uplink to Cat01
MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive not set
Full-duplex, 100Mb/s, link type is auto, media type is 10/100/1000BaseTX
06-28-2012 04:00 PM
I'm trying to configure the GigabitEthernet interface of the WS-C2960 switch to have a full duplex. Unfortunately, there is no option to configure this neither is the speed of that interface.
It's not a bug.
You cannot configure the speed and duplex setting of an fibre optic SFP port. Fibre optic SFP will negotiate to FULL Duplex and 1000Base, period.
06-29-2012 02:40 PM
Hi,
Will you please try to configure "duplex full" interface configuration at the WS-X4124-FX-MT module (other end) as the default setting is "half" for the Cat4000/4500 100-Mbps fiber modules and see if there is any progress.
Best regards,
Antonin
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