RE: Does the default-router command provide redundancy?

From: Rodolphe Abou Nassar (rabounassar@dataconsult.com.lb)
Date: Mon Aug 29 2005 - 06:08:30 GMT-3


The doc CD doesn't clearly mention whether this method works dynamically, and
on which platforms (Windows. Linux, etc).

I made the test in my lab, and it worked with windows XP: the client CAN take
2 default routers.

In other words, you can use this method instead of HSRP/VRRP/GLBP (with
limitations offcourse)

Thank you for your support.

Rudi

________________________________

From: Mitchell, TJ [mailto:tmitchell@allianttech.com]
Sent: Thursday, August 25, 2005 5:56 PM
To: Rodolphe Abou Nassar; Hictor Fernandez; Brant I. Stevens;
ccielab@groupstudy.com
Subject: RE: Does the default-router command provide redundancy?

Taken directly from the Doc CD:

default-router

To specify the default router list for a Dynamic Host Configuration Protocol
(DHCP) client, use the default-router command in DHCP pool configuration mode.
To remove the default router list, use the no form of this command.

default-router address [address2...address8]

no default-router

Syntax Description

address

Specifies the IP address of a router. One IP address is required, although you
can specify up to eight addresses in one command line.

address2...address8

(Optional) Specifies up to eight addresses in the command line.

Defaults

No default behavior or values.

Command Modes

DHCP pool configuration

Command History

Release

Modification

12.0(1)T

This command was introduced.

Usage Guidelines

The IP address of the router should be on the same subnet as the client
subnet. You can specify up to eight routers in the list. Routers are listed in
order of preference (address1 is the most preferred router, address2 is the
next most preferred router, and so on).

Examples

The following example specifies 10.12.1.99 as the IP address of the default
router:

default-router 10.12.1.99

This leads me to believe that it should work that way, please anyone let me
know if I'm reading this incorrectly.

Thanks

T.J. Mitchell

-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Rodolphe Abou Nassar
Sent: Thursday, August 25, 2005 9:32 AM
To: Hictor Fernandez; Brant I. Stevens; ccielab@groupstudy.com
Subject: RE: Does the default-router command provide redundancy?

Thanks Brant and Hector

Let's say that you are forbidden to use any of these dynamic methods, does the
default-router command do the job?

Rgds,

Rudi

-----Original Message-----

From: Hictor Fernandez [mailto:gnakh@telefonica.net]

Sent: Thursday, August 25, 2005 12:55 AM

To: Brant I. Stevens; Rodolphe Abou Nassar; ccielab@groupstudy.com

Subject: Re: Does the default-router command provide redundancy?

Hi,

I think behavior of an IP maching having two default gateways depends on its

implementation.

I wouldn't load two default gateways to a PC... Instead, Brant hit the

point... serve one gateway and look for whatever mechanism to make that

gateway redundant, like HSRP, GLBP, VRRP, etc...

Take care

Hictor

----- Original Message -----

From: "Brant I. Stevens" <branto@branto.com>

To: <rudi@dataconsult.com.lb>; <ccielab@groupstudy.com>

Sent: Wednesday, August 24, 2005 11:32 PM

Subject: Re: Does the default-router command provide redundancy?

> It looks like it is part of the IOS DHCP server scope/pool configuration.

> This is the DHCP client's default gateway, usually serviced by an HSRP

> virtual address.

>

>

>

> On 8/24/05 10:09 AM, "rudi@dataconsult.com.lb" <rudi@dataconsult.com.lb>

> wrote:

>

> > Hi,

> > Does the default-router command provide redundancy?

> > As posted on the Doc:

> >

http://www.cisco.com/univercd/cc/td/doc/product/software/ios123/123cgcr/ipras
_

> > r/ip1_d1g.htm#wp1078499

> > There is no clear indication whether this command provides redundancy

(ie, if

> > Gateway 1 fails, Gateway 2 takes over dynamically).

> > Then my question is:

> > What is the use of several arguments in this command?

> > Hope i was clear.

> > Thanks in advance.

> >

> > _______________________________________________________________________

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>

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