From: Alexei Monastyrnyi (alexeim@orcsoftware.com)
Date: Sun Sep 02 2007 - 16:07:59 ART
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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>>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>> ________________________________________________________________________
>>>
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>>> _______________________________________________________________________
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>>>>>>
>>>>>
>>>>> --
>>>>> 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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