From: Emre (emrekoyuncu@hotmail.com)
Date: Sat Feb 08 2003 - 17:24:14 GMT-3
Dear Paul,
IRDP is used for helping hosts to find their default gateway.The host may
be a PC or a router (ip routing disabled).
You can test it with routers or with PCs.The config is as follows. If you
want to test it with a PC you can replace R3.
R1
int eth 0
ip add a.b.c.d 255.0.0.0
ip irdp
ip irdp preference 1
R2
int eth 0
ip add a.e.f.g 255.0.0.0
ip irdp
ip irdp preference 2
R3
no ip routing
ip gdp irdp
int eth 0
ip add ....
The logic for IRDP router preference is also weird. The logic is as follows:
R1 - preference = 1 = 01 <--- in binary
R2 - preference = 2 = 10 <--- in binary
NOW invert :
R1 - preference = 1 = 10 <--- in binary
R2 - preference = 2 = 01 <--- in binary
NOW add one :
R1 - preference = 1 = 11 <--- in binary
R2 - preference = 2 = 10 <--- in binary
Convert back to decimal
R1 - preference = 1 = 3 (new value)
R2 - preference = 2 = 2 (new value)
Best Regards
Emre Koyuncu CCIE#10916
----- Original Message -----
From: "Casey, Paul (6822)" <Paul.Casey@o2.com>
To: "'Jonathan V Hays'" <jhays@jtan.com>
Cc: <ccielab@groupstudy.com>
Sent: Saturday, February 08, 2003 11:42 AM
Subject: RE: IRDP configuration information info requested.
> Yes I have read them, but there is no topology example and my question
still
> stands,
>
>
> -----Original Message-----
> From: Jonathan V Hays [mailto:jhays@jtan.com]
> Sent: 08 February 2003 19:25
> To: ccielab@groupstudy.com
> Subject: RE: IRDP configuration information info requested.
>
>
> Have you read this?
>
> http://www.cisco.com/univercd/cc/td/doc/product/software/ios121/121cgcr/
> ip_c/ipcprt1/1cdipadr.htm#1001945
>
> And this?
>
> http://www.cisco.com/univercd/cc/td/doc/product/software/ios121/121cgcr/
> ip_r/iprprt1/1rdipadr.htm#1018753
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Casey, Paul (6822)
> Sent: Saturday, February 08, 2003 12:59 PM
> To: 'ccielab@groupstudy.com'
> Subject: IRDP configuration information info requested.
>
>
> Hello.
>
> Does anyone have a sample config or document on how to use IRDP.
> I was on the Cisco website and there is very little info on it as far as I
> can see, regarding examples,
>
> I cant quite understand it,
> Can 2 routers back to back use it to learn routes from each other, without
a
> routing protocol, or is it just for PCs to learn there default gateway. Is
> it something similar to On demand routing,..? I know there only seems to
be
> a few commands needed to configure it, but I wanted to configure it in my
> lab to test it,
> Can I test with 2 routers or do I need PC,
> There was some other info on the Cisco website regarding it leaning
> EIGRP/RIP info for default-gateway usage,
> I am unclear as how to configure and test this,
> And doc/link/info/ would be greatly appreciated.
> I have looked on the web to no avail.
>
> Kind regards.
> Paul.
>
>
>
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