From: RSiddappa@xxxxxxxxxx
Date: Thu Mar 21 2002 - 05:33:01 GMT-3
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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