Re: [OT]Creating a unidirectional link failure scenario

Understanding why UdLD was created would help. Here is a way to test it.... This is the reason UdLD was created.

                      Sw1
                    Tx. Rx
                     /. \
                    /. \
                 Rx. Tx
              Sw2. Sw3
 
You will need to separate the TX and RX on one end of the cable and connect to opposite devices.

Regards,
 Joe Sanchez

On Apr 5, 2012, at 8:05 AM, Carlos G Mendioroz <tron_at_huapi.ba.ar> wrote:

> Sorry, what I meant is that you can not simulate a failure by cutting a wire on 1000baseT, i.e., gig over copper.
>
> Still I don't know what you are asking for...
>
> -Carlos
>
> sundeep sadhwani @ 05/04/2012 10:00 -0300 dixit:
>> Thanks for the reply.however i am using gig at the 4500 side i see that
>> the port is down at the 4500 side.
>>
>> I have faced this issue in the live network where we have to change the
>> fibre cable as both the interfaces were up and bcoz of cdp we came to
>> know that there is unidirectional link failure as 4500 was able to see
>> GSR but GSR was unable to see 4500. we cant use UDLD in this scenario as
>> GSR interface is layer 3.
>>
>> Regards
>> Sundeep
>>
>> On Thu, Apr 5, 2012 at 8:38 PM, Carlos G Mendioroz <tron_at_huapi.ba.ar
>> <mailto:tron_at_huapi.ba.ar>> wrote:
>>
>> What do you mean by simulate ? Cause you have already done that
>> by removing one fibre!
>>
>> In a 10/100 ethernet you can cut one wire. No such luck on giga.
>> In dynamips, you can block one stream or point to some unused port.
>>
>> -Carlos
>>
>>
>>
>> sundeep sadhwani @ 05/04/2012 06:49 -0300 dixit:
>>
>> Hi all
>>
>> I would need your suggestions in creating an unidirectional link
>> failure
>> scenario.
>>
>> i have two devices connected back to back GSR-----4500 through
>> fibre. I
>> have removed the Rx of the fibre from the GSR end. At the GSR
>> end if i
>> disable the negotiation the link interface on GSR comes up
>> however if i
>> disable the negotiation on 4500 port, the interface is still down.
>>
>> Any suggestion of simulating this would be appreciated.
>>
>> Regards
>> Sundeep
>>
>>
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>>
>> --
>> Carlos G Mendioroz <tron_at_huapi.ba.ar <mailto:tron_at_huapi.ba.ar>> LW7
>> EQI Argentina
>>
>>
>
> --
> Carlos G Mendioroz <tron_at_huapi.ba.ar> LW7 EQI Argentina
>
>
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Received on Thu Apr 05 2012 - 08:47:00 ART