Interface speed-switch

[erinedison]

Hi Team,

i changed one of the interface speed to 1000Mbps,immediately the interface turned off.

i made sure its capable of 10/100/1000Mbps.

now set to auto,int is up with speed 100Mbps.

whats the logic i am missing ?

Please advise,

Thanks

Erin

[Leo Laohoo]

whats the logic i am missing ?

Believe it or not, CABLE.  

Can you state the exact model of the switch and the complete IOS version?

[erinedison]

Switch details:

IOS: c2960s-universalk9-mz.122-55.SE7/c2960s-universalk9-mz.122-55.SE7.bin"

C2960S

Also,if i set all the ports to 1000Mbps,will it impact the network ? or the resources of switch ?any impact other than providing the speed.

please advise,

Thanks

Erin

[Leo Laohoo · Accepted solution]

Also,if i set all the ports to 1000Mbps,will it impact the network ?

Yes.  

1.  If you hard-code the ports to 1 Gbps and you've got faulty cable and/or the NIC cards don't support 1 Gbps; 

2.  If the wrong command is used, the interface will flap; 

3.  If the wrong command is used, the ports will have speed and duplex mismatch error.

IOS: c2960s-universalk9-mz.122-55.SE7/c2960s-universalk9-mz.122-55.SE7.bin"

Ok, 2960S supports TDR.

[erinedison]

Thank you ,the issue is-screenshot attached.

all resolved now.

Erin

[Leo Laohoo]

*TOINK!*

You've just broken my longest cable run record of 115 metres.