From: Tshon (tshon@xxxxxxxxxxx)
Date: Thu Mar 21 2002 - 10:30:53 GMT-3
Ok, I can understand that.
RSiddappa@NECBNS.com wrote:
>
>
>But when we want to use IRDP in combination with HSRP. Will not not make a
>differnce.
>
>R.
>
>
>
>-----Original Message-----
>From: Tshon [mailto:tshon@netzero.net]
>Sent: Wednesday, March 20, 2002 11:12 PM
>To: Erick B.
>Cc: Williams, Glenn; 'ccielab@groupstudy.com'
>Subject: Re: ip irdp address
>
>
>I go with Erick.
>
>ICMP Router Discovery Protocol is for devices that can dynamically learn
>their default gateway. The routers send out IRDP advertising themselves
>as the default along with their preferences. The host chooses the higher
>preference and starts using the router as it's gateway. The question comes
>into play when you have two routers that could be the default gateway and
>one of them doesn't support IRDP. The router that Does can proxy-advertise
>that router and the preference assigned that router. That way the host
>can choose the appropriate gateway.
>
>The Cisco IOS software can proxy-advertise other machines that use IRDP;
>however, this is not recommended because it is possible to advertise
>nonexistent
>machines or machines that are down.
>
>What the note says is that when the proxy-advertised router goes down,
>the IRDP
>router will continue to advertise the router anyway. Big problem, if it
>has the higher
>preference. I would use something like this in a three router or more
>situation.
>And let the proxy-advertised router get the least highest preference.
>
>Erick B. wrote:
>
>>Hi,
>>
>>I can't think of a practical example for this, but I
>>have played with this on some router configs I did in
>>my studies. By default, IRDP will announce the
>>interfaces IP address with default preference. With
>>this command you can have IRDP broadcast another IP
>>address besides the IP address on the router
>>interface.
>>
>>Maybe this would be useful if you had a
>>router/fwall/etc that didn't support IRDP. You could
>>then announce that devices IP on the router via IRDP.
>>
>>--- "Williams, Glenn" <WILLIAMSG@PANASONIC.COM> wrote:
>>
>>>Does anyone know or can show how to practically use
>>>the "ip irdp address"
>>>command. The CCO says:
>>>"The Cisco IOS software can proxy-advertise other
>>>machines that use IRDP;
>>>however, this is not recommended because it is
>>>possible to advertise
>>>nonexistent machines or machines that are down."
>>>That is all I can find and it does not sink in to me
>>>for how to use it.
>>>TIA
>>>GW
>>>
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