Re: IRDP in CCIE Lab & Real world use

From: Mathew Fernando (mathewfer@gmail.com)
Date: Tue Aug 01 2006 - 09:13:04 ART

Hi All,

Thank you for all the replies.

I setup 3 routers on the same LAN and the details below will help
others later on.

R1, R4 & R6 on same LAN

R1 acts a IRDP Client and R4 & R6 acts as a 2 Gateways but R6 is

prefered as it has got the higher preference over R4. When R6 is down,

R4 will be the gateway.

R1:

!
no ip routing
!
ip gdp irdp
!
interface Ethernet0/0
 ip address 155.1.146.1 255.255.255.0
!

R1#sho ip irdp e 0/0
Ethernet0/0 has router discovery disabled

R1#
R1#sho ip route
Gateway Using Interval Priority Interface
155.1.146.6 IRDP 900 200 Ethernet0/0

Default gateway is 155.1.146.6

Host Gateway Last Use Total Uses Interface
150.1.4.4 155.1.146.4 0:00 28 Ethernet0/0
R1#

R4:

!
interface Ethernet0
 ip address 204.12.1.4 255.255.255.0
 ip irdp
 ip irdp preference 100
!
R4#sho ip irdp e 0
Ethernet0 has router discovery enabled

Advertisements will occur between every 450 and 600 seconds.
Advertisements are sent with broadcasts.
Advertisements are valid for 1800 seconds.
Default preference will be 100.
R4#

R6:

!
interface Ethernet0
 ip address 155.1.146.6 255.255.255.0
 ip irdp
 ip irdp preference 200
!

R6#sho ip irdp e 0
Ethernet0 has router discovery enabled

Advertisements will occur between every 450 and 600 seconds.
Advertisements are sent with broadcasts.
Advertisements are valid for 1800 seconds.
Default preference will be 200.
R6#

After R6's E 0 is shutdown;

R1#sho ip route
Gateway Using Interval Priority Interface

Default gateway is not set

Host Gateway Last Use Total Uses Interface
150.1.4.4 155.1.146.4 0:00 94 Ethernet0/0
R1#

mathew

On 8/1/06, Ivan <ivan@iip.net> wrote:
> AFAIR gdp it is feature to discover gateway through IRDP, RIP. More
> preferrable is IRDP. And after IOS 11.2 is neglected.
>
> > Hi Group,
> >
> > Thanks you for the quick replies.
> >
> > As I understand "ip gdp irdp" is used to make the CISCO router as a
> > Client when IP routung is disabled.
> >
> > Whereas, "ip irdp" announce the router as a Gateway to clients. The
> > options under this command help us to specify the preference, timers
> > etc and only this command is sufficient.
> >
> > Can you all pls confirm that my understanding is correct above?
> >
> > I am trying to lab this up soon.
> >
> > mathew
> >
> > On 8/1/06, Ivan <ivan@iip.net> wrote:
> > > 3) When enable ip irdp on LAN interface router will send ICMP-broadcast
> > > to the LAN advertising myself or proxy addres. Windows-host has built in
> > > client. To compatible SunOS need to use "multicast" keyword. This force
> > > send advertiment to 224.0.0.1 instead broadcast.
> > >
> > > 2) Parameter priority used to define prefer gateway if receved number
> > > IRDP-advertisment.
> > >
> > > > Hi Group,
> > > >
> > > > When we configure a CISCO router to announce itself as a Default
> > > > gateway via IRDP, I think all we need is to configure "ip irdp"
> > > > (minimum) under the LAN interface. Here I believe router acts as a
> > > > server.
> > > >
> > > > 1. Is the IRDP client/server architecture?
> > > >
> > > > 2. Is this a dynamic way to tell the clients compared to static ways
> > > > like HSRP/VVRP?
> > > >
> > > > 2. How do the Clients (Windows, Linux etc) learn this gateway?
> > > >
> > > >
> > > > Thanks
> > > >
> > > > Mathew
> > > >
> > > > _______________________________________________________________________
> > > > Subscription information may be found at:
> > > > http://www.groupstudy.com/list/CCIELab.html
> > >
> > > --
> > > Ivan
>
> --
> Ivan
> 

-- 
Thanks

Mathew

This archive was generated by hypermail 2.1.4 : Fri Sep 01 2006 - 15:41:56 ART