Re: NLB with Catalyst switches

Gerald:

Thanks for replying to my post.

So I guess I was heading in the right direction. It looks like I will not
be able to stop the flooding issue on the switch so I will have to isolate
it to a separate VLAN and place my NLB TS servers in it. When the flooding
occurs it will only effect the NLB TS servers. I am still leery of what
this will do to the users sessions when it happens.... In addition I assume
I should reconfigure to multicast and add a 2nd NIC to the servers. So the
NIC configuration should be as follows

NIC 1
NLB - ENABLED
Server IP Address - 10.1.1.7
Cluster IP Virtual Address - 10.1.1.6
Default Gateway - BLANK

NIC 2
NLB - *** NOT ENABLED ***
Server IP Address - 10.1.1.8
Cluster IP Virtual Address - 10.1.1.6
Default Gateway - Configured

This should allow traffic to be received on NIC 1 and sent back on NIC 2 if
I understand correctly. Anymore advice you have would be greatly
appreciated. I have a maintenance window tomorrow night and I am going to
reconfigure everything then.

Thanks again...

Harrison Midkiff


"Gerald Aigenbauer" <ga@xxxxxx> wrote in message
news:uUMhaSqOFHA.2748@xxxxxxxxxxxxxxxxxxxxxxx
> hi harrison!
>
> you have two possibilities: configuring a vlan for the both network card
> ports on the cisco switches, or you use a switch for the two cluster nlb
> nodes only. in both cases you connect the new formed network via l3
> routing interface (l3 switch oder router) to the rest of your network
> infrastructure.
>
> look here for some extra information: Installing NLB on a Dual-NIC System
> with seperated Heartbeat
>
> gerald aigenbauer.
>
> "Harrison Midkiff" <HMidkiff@xxxxxxxxxx> schrieb im Newsbeitrag
> news:ef08UNqOFHA.1172@xxxxxxxxxxxxxxxxxxxxxxx
>> Hello:
>>
>> I have recent upgraded my network and deployed Cisco switches with VLAN,
>> trunking and EtherChannels. After a few days I started experiencing
>> brief periods where all network traffic would bog down. After performing
>> several sniffs I was able to determine the problem was my 2 NLB TS
>> servers. Due to both servers having the same virtual MAC address I am
>> getting unicast flooding when there is an ARP request for the MAC address
>> of the virtual IP address assigned to the NLB. Currently my NLB servers
>> are in unicast mode and I am using 1 NIC. I thought using a second NIC
>> and reconfiguring to multicast would correct this problem but it does
>> not. The switch flooding issue still has the potential to reoccur.
>>
>> I have read over a dozen TechNet articles on configuring NLB but they do
>> not go into enough detail when it comes to the ARP requests regarding the
>> virtual MAC and switches. I read a blurg in "Intro MS Windows Server
>> 2003" which talked about switch flooding and said to place the severs on
>> there own VLAN. With all the reading I have been doing for best
>> performance I should use 2 NICs.
>>
>> Is creating a new VLAN for these servers my best option? Is there
>> something better? Does anyone know of the best way to reconfigure this
>> for performance and good TechNet articles?
>>
>> Harrison Midkiff
>>
>
>


.

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