From: Private Ryan (private_ryan2k1@yahoo.com)
Date: Mon Sep 12 2005 - 11:56:39 GMT-3
Tim,
Thanks a lot !
Ryan
--- Tim <ccie2be@nyc.rr.com> wrote:
> Ryan,
>
> I think the key to success on the lab regarding this
> topic is understanding
> what the different effects of failure of the primary
> gateway will be on the
> hosts.
>
> With the dhcp default-gateway command used to
> provide multiple gateways, it
> is up to the hosts to figure out when the primary
> gateway is no longer
> available and use a secondary gateway. This might
> require that irdp is also
> configured. But, the critical point is this: What
> happens when the primary
> gateway fails depends on the hosts and the failure
> of the primary gateway
> may result in active sessions on the host timing
> out.
>
> With HRSP, VRRP and GLBP, the failure of the primary
> gateway and switchover
> to a secondary gateway is transparent to hosts on
> the segment.
>
> As long as you understand this, you should be OK on
> the lab if you encounter
> a task like this. But, of course, if you have any
> doubt as to what you're
> being asked to do, ASK THE PROCTOR. That's what
> they're there for.
>
> HTH, Tim
>
> -----Original Message-----
> From: nobody@groupstudy.com
> [mailto:nobody@groupstudy.com] On Behalf Of
> Private Ryan
> Sent: Sunday, September 11, 2005 11:00 PM
> To: Marvin Greenlee
> Cc: ccielab@groupstudy.com
> Subject: RE: multiple default-router in DHCP
>
> Thanks.
> I used a windows machine for DHCP testing and it can
> install several ip in "Default Gateway". When I
> shutdown the first IP address, the windows can't use
> the second address. don't know how windows hand
> multiple ip addresses as default gateway.
>
>
> Ryan
>
> --- Marvin Greenlee <marvingreenlee@yahoo.com>
> wrote:
>
> > When multiple addresses are used, it is up to the
> > client implementations to determine when each of
> the
> > gateway addresses are unavailable. DHCP just
> hands
> > the addresses out.
> >
> > - Marvin Greenlee, CCIE #12237
> >
> > --- Private Ryan <private_ryan2k1@yahoo.com>
> wrote:
> >
> > > What is the use of
> > > > default-router address [address2 ... address8]
> > > in DHCP option?
> > >
> > > thanks !
> > >
> > > Ryan
> > > --- "Chris Lewis (chrlewis)"
> <chrlewis@cisco.com>
> > > wrote:
> > >
> > > > VRRP?
> > > >
> > > > -----Original Message-----
> > > > From: nobody@groupstudy.com
> > > > [mailto:nobody@groupstudy.com] On Behalf Of
> > > > Venkataramanaiah.R
> > > > Sent: Sunday, September 11, 2005 8:08 AM
> > > > To: Private Ryan
> > > > Cc: ccielab@groupstudy.com
> > > > Subject: Re: multiple default-router in DHCP
> > > >
> > > > I faced a similar issue.. I guess what is
> > required
> > > > here is to configure
> > > > IRDP on both the routers, Is there any better
> > > > solution to this problem?
> > > >
> > > > -Venkat
> > > >
> > > > On 9/11/05, Private Ryan
> > > <private_ryan2k1@yahoo.com>
> > > > wrote:
> > > > >
> > > > > Hi,
> > > > >
> > > > > In dhcp server configuration, I can enter up
> > to
> > > 8
> > > > address for
> > > > > default-router. I tested the dhcp using
> router
> > > as
> > > > a dhcp client. I
> > > > > found that it always use the 1st address as
> > > > default gateway. even if I
> > > >
> > > > > shutdown the 1st address in my network, the
> > > client
> > > > will never use the
> > > > > 2nd address. When "address2 ... address8 "
> > > > > will be used ?
> > > > >
> > > > > Router(dhcp-config)# default-router address
> > > > [address2 ... address8]
> > > > >
> > > > > Another Question
> > > > > Configure DHCP for VLAN A subnet and R1 as
> > > default
> > > > gateway. Use R2 as
> > > > > default gateway when R1 is down.
> > > > > You are not allowed to use HSRP. Should I
> use
> > > > > "address2 ... address8" for my solution?
> > > > >
> > > > > i.e. default-router R1 R2
> > > > >
> > > > > Thanks !
> > > > >
> > > > >
> > >
> __________________________________________________
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> > > >
> > >
> >
>
This archive was generated by hypermail 2.1.4 : Sun Oct 02 2005 - 14:40:14 GMT-3