[c-nsp] any information why the switch port can't be force

[Billy Guthrie]

Derick,

You have not provided much information; It would be beautiful if you could
provide the make, model, config, and IOS version of both devices.

Things to note:

1. If auto-negotiation is disabled (manually forcing the link to 
10/100/1000 full, Auto-MDI/MDIX cannot work because
there is no signal transmission at initialization to sample the cabling 
with.

2. Gigabit it requires the use of all four pairs, unlike older Ethernet. 
The pairing in gigabit cabling must be
1-2, 3-6, 4-5, 7-8; the 4-5 and 7-8 pairs aren’t used in 10/100 
Ethernet; On some equipment, when only using 2 pairs, then
negotiation will take place on two pairs only, so the devices 
successfully choose 'gigabit' as the highest common denominator,
but the link never comes up.

3. Speed mismatch (Or some other form of misconfiguration).

4. Hardware issue (Port, connector, cable, etc.).

5. Everything could be fine and just related a bug

6. That is all I can think of right now (issues I have seen in the past).

Good Luck,

Billy



Deric Kwok wrote:
> Hi
>
> Any information why the switch copper port is not forcing to GigE full duplex
> After setting, the light is not showing. The port can show
> 10/100/1000BaseTX in auto
>
> Thank you
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