From: Tshon (tshon@xxxxxxxxxxx)
Date: Thu Mar 21 2002 - 11:22:22 GMT-3
You could have .5 and .6 proxy-advertise HSRP .7 then via IRDP the
Workstation would use the .7 instead of .5 or .6 that
way it rolls to the other no matter which one has it. especially if you
use a combination with the watch command.
Williams, Glenn wrote:
> Ok, appreciate this dialogue. So let me bounce this. Lets say I have
> two routers on same vlan. (BTW, this is probably not what I would
> build but a what if...) The ip 's of routers are 10.1.1.5 and
> 10.1.1.6. Both can get tosame places in the network, so kind of
> redundancy for that vlan. My workstation says and has defined .6 is
> default gateway. But now .6 goes down. Can .5 pretend to be .6 by
> using this irdp address command (you know proxy advertise it) Would
> the PChave to be able to dynamically learn (that is understand irdp)
> in this situation or no or does it matter?
>
> Can Windows deal with IRDP to learn dynamically the default GW?
>
> Glenn
>
> -----Original Message-----
> From: Tshon [mailto:tshon@netzero.net]
> Sent: Thursday, March 21, 2002 7:31 AM
> To: RSiddappa@NECBNS.com
> Cc: erickbe@yahoo.com; Williams, Glenn; ccielab@groupstudy.com
> Subject: Re: ip irdp address
>
> 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<
>>br>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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