[c-nsp] The myths of autonegotiate vs forced

[Derick Winkworth]

Its an ASIC thing.

What you can configure the port to do is only negotiate at a subset of speeds it 
is capable of.  I think this is actually a feature of the ASIC, not software per 
se.

I'm guessing.




________________________________
From: Peter Rathlev <peter at rathlev.dk>
To: Jim Getker (getker) <getker at cisco.com>
Cc: cisco-nsp at puck.nether.net
Sent: Fri, August 20, 2010 3:36:27 PM
Subject: Re: [c-nsp] The myths of autonegotiate vs forced

On Fri, 2010-08-20 at 14:58 -0500, Jim Getker (getker) wrote:
> The 6K gigabit copper ports support speed auto 10 100.

Hm... it actually does support "speed auto 10 100", but "speed auto 100"
returns an error (WS-X6748-GE-TX):

Switch(config)#int gi1/1
Switch(config-if)#speed auto 100 
Speed autonegotiation subset is not supported on this interface
Switch(config-if)#speed auto 10 100 
Switch(config-if)#

This confuses a novice like me. Maybe the output could be adjusted a
little? :-)

(And why support "10/100 only" and not "100 only" anyway? Standards
compliance of some kind?)

-- 
Peter


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