From: daniel (igevioya@gmail.com)
Date: Sun Sep 02 2007 - 13:59:54 ART
Hi,
You could use the routers as the dhcp servers with each router giving out
seperate address range (from the same scope) and each router advertising the
hsrp/glbp address as d default gateway.
Rgds
dan
On 9/2/07, Donghai Zhang <zdh1207@gmail.com> wrote:
>
> Dear Jerry,
> I think you've given the right answer if it works. Thank you. As what I
> have done in this subject, I have only one dhcp server, so things left to
> do
> is to ask the boss to buy more a new one. But before I go to persuade him,
> can I have a little more simpler solution? Actually I have tried the way
> similar to yours in one server (the difference is that mine has no VIP).
> In
> the dhcp server,I split the address, set into two different address
> pools,each one having one half of the usable address;each pool has a
> different default gateway. I found it works, but not so good as I wish.
> The
> dhcp didn't rotate between the two pools smoothly, basically hits counts
> is
> 10:2 or 10:3. that's what I got the best outcome. Loading balance did
> occur,but not half vs.half.
> Anyone show a solution as the way of Jerry's with only one DHCP will be
> appreciate.
>
> 2007/9/2, jerry.du@accenture.com <jerry.du@accenture.com>:
> >
> > Donghai,
> >
> > You can consider split your DHCP to two DHCP servers and place those
> > DHCP server into a pool of load balance with a VIP. Config two DHCP
> > server to different gateway and config helper-address by DHCP VIP
> > address.
> >
> >
> > Like this:
> >
> > 1.DHCP server A(132.1.1.10) 132.1.25.0/24, reserved 128 IP address for
> > DHCP server B
> > 2.DHCP server B(132.1.1.20) 132.1.25.0/24, reserved 128 IP address for
> > DHCP server A.
> >
> > 3. Put DHCP server 132.1.1.10 and 132.1.1.20 into load-balance pool with
> > VIP 132.1.1.30
> >
> > 4.Config helper-address 132.1.1.30 in HSRP configured router.
> >
> >
> >
> >
> >
> > Regards,
> > Jerry
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> > Donghai Zhang
> > Sent: Sunday, September 02, 2007 7:00 PM
> > To: Narbik Kocharians
> > Cc: Travis Anderson; Cisco certification
> > Subject: Re: How to load balance under DHCP
> >
> > thanks for your kindness,Narbik. However, what I need is that half of
> > the
> > hosts have the 131.1.25.2 as their default gatewany, and the other half
> > have
> > 131.1.25.22 as their gateway. If you set those PCs one by one , surely
> > they
> > do. But with a DHCP server, how to tell the server to do as you wish?
> >
> > 2007/9/2, Narbik Kocharians <narbikk@gmail.com>:
> > >
> > > *Task 1*
> > >
> > >
> > >
> > > Configure VLAN25 such that half of the users use R2 as the primary
> > default
> > > gateway and R5 as the backup. The other half should use R5 as the
> > primary
> > > and R2 as their backup default gateway. Use the following IP addresses
> > to
> > > accomplish this task:
> > >
> > >
> > >
> > > 131.1.25.22 /24 and 131.1.25.55 /24
> > >
> > >
> > >
> > > * *
> > >
> > > *On R2*
> > >
> > > * *
> > >
> > > R2(config)#int f0/0
> > >
> > > *R2(config-if)#standby 1 priority 200*
> > >
> > > *R2(config-if)#standby 1 preempt*
> > >
> > > *R2(config-if)#standby 1 ip 131.1.25.22*
> > >
> > > R2(config-if)#standby 2 ip 131.1.25.55
> > >
> > >
> > >
> > > *On R5*
> > >
> > >
> > >
> > > R5(config)#int f0/0
> > >
> > > R5(config-if)#standby 1 ip 131.1.25.22
> > >
> > > *R5(config-if)#standby 2 ip 131.1.25.55*
> > >
> > > *R5(config-if)#standby 2 preempt*
> > >
> > > *R5(config-if)#standby 2 priority 200*
> > >
> > > * *
> > >
> > > * *
> > >
> > > *To verify the configuration:*
> > >
> > > * *
> > >
> > >
> > >
> > > *On R2*
> > >
> > > * *
> > >
> > > *show standby brief*
> > >
> > > * *
> > >
> > > P indicates configured to preempt.
> > >
> > > |
> > >
> > > Interface Grp Prio P State Active Standby
> > Virtual
> > > IP
> > >
> > > Fa0/0 *1 200 P Active local* 131.1.25.5
> > > 131.1.25.22
> > >
> > > Fa0/0 2 100 Standby 131.1.25.5 local
> > > 131.1.25.55
> > >
> > > * *
> > >
> > > * *
> > >
> > > *On R5*
> > >
> > > * *
> > >
> > > *Show standby brief*
> > >
> > > * *
> > >
> > > P indicates configured to preempt.
> > >
> > > |
> > >
> > > Interface Grp Prio P State Active Standby
> > Virtual
> > > IP
> > >
> > > Fa0/0 1 100 Standby 131.1.25.2 local
> > > 131.1.25.22
> > >
> > > Fa0/0 * 2 200 P Active local* 131.1.25.2
> > > 131.1.25.55
> > >
> > >
> > >
> > > *Note R2 is the active router for group 1 and standby for group 2,
> > whereas
> > > R5 is the active for group 2 and standby for group 1.*
> > >
> > >
> > > I thought i should copy one of the tasks from my work book, is this
> > what
> > > you were looking for?
> > >
> > >
> > > On 9/2/07, Donghai Zhang <zdh1207@gmail.com> wrote:
> > > >
> > > > Dear Travis,
> > > > HSRP groups can serve as gateway redundancy, not as load balance.
> > > > Actually what I have done is seting two groups,one for half of the
> > > > hosts,and
> > > > one for the rest. The problems is how to let hosts get the right
> > > > default-gateway address? Maybe you could do it manually, but with
> > DHCP,
> > > > how
> > > > to let the DHCP server give one host this default gateway and next
> > host
> > > > the
> > > > other one?
> > > >
> > > >
> > > > 2007/9/2, Travis Anderson <totaldrive2000@yahoo.com>:
> > > > >
> > > > > You can use HSRP groups.
> > > > >
> > > > >
> > > > >
> > > >
> > http://www.cisco.com/en/US/tech/tk648/tk362/technologies_configuration_e
> > xample09186a0080094e90.shtml
> > > > >
> > > > > Travis,
> > > > > --- Donghai Zhang <zdh1207@gmail.com> wrote:
> > > > >
> > > > > > Hey,dear friends,
> > > > > > I have my local LAN with two HSRP routers
> > > > > > implemented, as the gateways.
> > > > > > I also have a DHCP servers deployed. There's only
> > > > > > one C type address that I
> > > > > > can use inside the DHCP pool. What I need is that
> > > > > > half of the hosts get one
> > > > > > default gateway, and the other half get a different
> > > > > > gateway, I have the only
> > > > > > choice of using HSRP as the gateway backup protocol.
> > > > > > How Can I do it ? I
> > > > > > know by GLBP is OK,but which is out of question.
> > > > > > thanx.
> > > > > >
> > > > > >
> > > > >
> > > >
> > _______________________________________________________________________
> > > > > > Subscription information may be found at:
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> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > >
> > ________________________________________________________________________
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> > >
> > >
> > >
> > > --
> > > Narbik Kocharians
> > > CCIE# 12410 (R&S, SP, Security)
> > > CCSI# 30832
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> >
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