From: Donghai Zhang (zdh1207@gmail.com)
Date: Mon Sep 03 2007 - 01:08:54 ART
alexeim,
thanks.Yours method is a way to solve the problem,except some side
effects:1, You have to split hosts into two vlans,which means users belongs
to different vlan cannot see each other in their neighber. If this doesn't
matter, but 2, If one dhcp run out of its address in its address pool, it
cannot make use of addresses in the other one,even it has still a lot of
unused addresses.
2007/9/3, Alexei Monastyrnyi <alexeim@orcsoftware.com>:
>
> Donghal,
> you can try splitting /24 subnet into two /25 VLANs, setting up two HSRP
> pairs - one per VLAN with primary-secondary routers opposed in each
> pair, setting up two DHCP servers - one per VLAN, setting up access
> ports 50x50 among those VLANs... a bit clumsy :-)
>
> A.
>
> Donghai Zhang wrote:
> > Of course you are right but I could only use one router as DHCP server.
> >
> > 2007/9/3, daniel <igevioya@gmail.com>:
> >
> >> 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.
> >>>>>>>>
> >>>>>>>>
> >>>>>>>>
> >>>
> _______________________________________________________________________
> >>>
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> >>>>>>>> http://www.groupstudy.com/list/CCIELab.html
> >>>>>>>>
> >>>>>>>>
> >>>>>>>
> >>>>>>>
> >>>>>>>
> >>>>>>>
> >>>>>>>
> >>>
> ________________________________________________________________________
> >>>
> >>>> ____________
> >>>>
> >>>>>>> Choose the right car based on your needs. Check out Yahoo!
> >>>>>>>
> >>> Autos
> >>>
> >>>> new
> >>>>
> >>>>>> Car
> >>>>>>
> >>>>>>> Finder tool.
> >>>>>>> http://autos.yahoo.com/carfinder/
> >>>>>>>
> >>>>>>
> >>>
> _______________________________________________________________________
> >>>
> >>>>>> Subscription information may be found at:
> >>>>>> http://www.groupstudy.com/list/CCIELab.html
> >>>>>>
> >>>>>>
> >>>>>
> >>>>> --
> >>>>> Narbik Kocharians
> >>>>> CCIE# 12410 (R&S, SP, Security)
> >>>>> CCSI# 30832
> >>>>> www.Net-WorkBooks.com <http://www.net-workbooks.com/> <
> http://www.net-workbooks.com/
> >>>>>
> >>>>
> >>>>
> >>>
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