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3945 speed negotiation

I have 3945 router with a Gig interface having an optical module(GLC-LC-SM).

Basically I use a fiber from my gig interface to ISP

My ISP doesnot allow the use of speed as auto/auto

But in my Gig interface, I want to stop autonegotiation.

I have a universal image 15.0(1)M3 -c3900-universalk9-mz.SPA.150-1.M3 with ipbasek9 and datak9 licences enabled

I dont have a command that disables speed negotiation

1) I have a doubt. Does speed 10(or) 100 (or) 1000 as mentioned below will disable negotiation.

Because in other IOS we have a seperate command "speed no-negotiate" that disables and we also

do a "speed <val>" to hardcode the speed


Router(config-if)#speed ?
  10    Force 10 Mbps operation
  100   Force 100 Mbps operation
  1000  Force 1000 Mbps operation
  auto  Enable AUTO speed configuration

Please help on whether we need a seperate command to disable speed autonegotiation (or) will the speed <val>

do it ( manually configures a speed by disabling speed negotiation)

If so what is the use of speed no-negotiate that comes in certain IOS?

Thank you all.

2 REPLIES 2
Hall of Fame Master

Re: 3945 speed negotiation

With fiber SFP module, speed is fixed and auto-negotiation is disabled.

Consequently, there is no need to enter any command.

Highlighted
Cisco Employee

Re: 3945 speed negotiation

Is it only with the later IOS or is it with old IOS too.

Because my ISP doesnot allow auto/auto

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