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Cisco ISR 4451 - Interface setting

RS19
Level 4
Level 4

I have Cisco ISR 4451. I has interface Gi0/0/0
I want to set the port to 1000/full.

Is the below command command sufficient ?

interface GigabitEthernet0/0/0
speed 1000
no negotiation auto

Or should i also need to add "duplex full"

Let me know.

13 Replies 13

Joseph W. Doherty
Hall of Fame
Hall of Fame

Not 100% positive with gig Ethernet, but w/o duplex full, and w/o auto, believe you'll get 1000/half.

BTW, why do you want to hard code 1000/full?  Since the beginning of this century, hardware vendors recommend auto/auto.

cause it is connected to ISP ONU & it is the recommendation from the ISP

ISP hard coded full duplex "recommendation"?!  Are you sure it's not a requirement?

Reason I ask, normally both sides should be configured alike.  An auto<>full will end up as half<>full.  I.e. if ISP is using full, then your side should be using full.

Working with an ISP, unsurprising they are still using a last century practice.

 

RS19
Level 4
Level 4

any inputs ?

If ISP router is from other vendor and don't use autonego then  disable autonego and hardcoded the speed and duplex 

Speed xxxx

Duplex full

MHM

Hello @RS19 ,

it is better to not leave any doubt so when going manual use commands to set both speed and duplex

int gi0/0/0

speed 1000

duplex full

only in this way you can be sure it will be 1000 Mbps full duplex

Hope to help

Giuseppe

 

Hello
My understanding full gig ports are full duplex by default, this cannot be change, only 10/100/1000 ports have that capability


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Paul

u mentioned 10/100/1000 ports. 1000 means 1 G right . Is my understanding right.

Hello
EDITED:-- should state ive found this to be applicable on certain platforms.

I mean ports that can be either be 10/100/1000 have the capabiltiy to be duplex set, true 1GB + ports are full duplex by default and dont have the capability to have duplex hardcoded on certain plaforms at least


Please rate and mark as an accepted solution if you have found any of the information provided useful.
This then could assist others on these forums to find a valuable answer and broadens the community’s global network.

Kind Regards
Paul

I recall (???) even for copper, gig doesn't allow for half duplex, i.e. possibly it's non-standard, but platforms may permit it for 3x speed ports, where half is a standard for 10 and 100.  This might explain the difference @paul driver notes he has observed for 3x vs. gig only ports.

Yes correct 

10/100/1000 is for mbytes

1000 mbytes is equal to 1gbytes

MHM

Hello
This post has got me thinking,
im aware on some platform you can specify the media or disable negotiation, so the speed/duplex are then viable. However surely others on this forum have also come across 1Gb + ports that you cannot hardcode the duplex?

I definitely have but I just cannot remember what platforms and software it was on?


Please rate and mark as an accepted solution if you have found any of the information provided useful.
This then could assist others on these forums to find a valuable answer and broadens the community’s global network.

Kind Regards
Paul

You are correct some 1 G can not hardcoded it duplex 

But let wait his try to config both speed and duplex