From: Cham (chamandeep.gill@gmail.com)
Date: Wed Apr 26 2006 - 05:27:19 GMT-3
I was also looking into this some time back, found the below GS thread
to be very helpful.
Check out the entire thread
http://www.groupstudy.com/archives/ccielab/200501/msg00065.html
HTH
cham
On 4/26/06, CCIE KH49279 <ccie_lab@inetiq.com> wrote:
> Ultimately this is what I have gathered from the responses.
>
> Using multiple default-router addresses in the DHCP configuration will yield
> a less than desirable gateway redundancy based upon host parameters (i.e.
> ARP timeouts, number of default-router addresses a host will accept), and
> the only network controlled piece is really the assignment of the
> default-router addresses.
>
> In a scenario where HSRP is not allowed, using VRRP would be the most
> appropriate, and it looks as if IRDP would be a better solution than using
> default-router (i.e. host selection of gateways) assuming the host were
> capable of IRDP.
>
> Thoughts or comments, otherwise I think I have it and will let it rest.
>
> Thanks for those who responded both publicly and privately.
>
> Regards,
>
> Wayne
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Aaron Pilcher
> Sent: Tuesday, April 25, 2006 9:20 PM
> To: 'Jung-I Lin'; 'CCIE KH49279'
> Cc: 'Cisco certification'
> Subject: RE: DHCP default-router
>
> One of the problems, with clients handling first hop redundancy, is that
> they will only stop sending traffic to the primary default GW when their ARP
> entry for it ages out. I think the arp time out is 2 min by default,
> therefore from the moment the "primary" router goes down there will be a 2
> min gap for off local network communications.
>
>
>
> 'just cause you can do something...doesn't necessarily mean you should
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Jung-I Lin
> Sent: Tuesday, April 25, 2006 8:59 PM
> To: CCIE KH49279
> Cc: Cisco certification
> Subject: Re: DHCP default-router
>
> Hi, Wayne
>
> You can have certain level of redundancy by configuring multiple
> default-gateway on WinXP or Win2k3.
> See the url
> http://www.microsoft.com/technet/community/columns/cableguy/cg0903.mspx#EPH
>
>
> HTH.
>
> On 4/26/06, CCIE KH49279 <ccie_lab@inetiq.com> wrote:
> > Group,
> >
> > I am a bit confused about the use of the default-router command in DHCP.
> >
> > I understand the function of the command and the information it will cause
> > the dhcp server to provide to the host.
> >
> > However, the documentation mentions that up to 8 default-routers can be
> > assigned under this command. To me this suggest that you can provide some
> > level (albeit not very flexible) of gateway redundancy. I unfortunately
> have
> > no facility to test this critter so I am posting to the group for your
> > assistance and knowledge.
> >
> > What happens if I use this as part of my configuration:
> >
> > Default-router 192.168.10.1 192.168.10.2 192.168.10.3
> >
> > If for instance the host initially gets 10.1 assigned as the
> > default-gateway, and then during the lease period 10.1 becomes
> unreachable,
> > will the host automatically switch to the 10.2 gateway, or will the host
> > query the dhcp server again and then be assigned the 10.2 address, or ???
> >
> >
> > Thanks in Advance,
> >
> > Wayne
> >
> > _______________________________________________________________________
> > Subscription information may be found at:
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> >
>
>
> --
> Thanks
> Best Regards,
>
> Jung-I Lin
>
> _______________________________________________________________________
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