Re: OSPF auto-cost reference-bandwidth command

It may depend on your IOS version or the hardware platform that you
are using. Changing the auto-cost bandwidth definitely doesn't flap
OSPF or any of your adjacencies and it certainly shouldn't give you
any traceback messages.

You do are required to change ALL the routers participating in the
OSPF domain as you would get very weird results when not changing it
on all the routers.

Again you might have run into an IOS bug. I never saw this after
entering the auto-cost command :-)

--
Regards,
Rick Mur
CCIE2 #21946 (R&S / Service Provider)
Sr. Support Engineer  IPexpert, Inc.
URL: http://www.IPexpert.com
On 12 okt 2009, at 18:42, Cisco Fanatic wrote:
> All,
>
> I saw this strange behavior when i configured "auto-cost reference- 
> bandwidth
> 200000" under the OSPF process.
>
> After applying the command the router started flapping and there were
> traceback errors at the same time. The flaps stopped once the  
> command was
> reversed.
>
> I figured out the reason for the traceback which was due to the fact  
> the
> router was not able to reach the TACACS server when the OSPF went  
> down.
>
> But, the real problem is if there is a know issue with the auto-cost  
> command
> when applying on a fly that will make OSPF flap.
>
> I don't want to encounter this in my LAB :(- also this seems to be a  
> good
> question for Troubleshooting section :)
>
> -Yuri
> 		 	   		
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