NLB w/Layer3 Switch
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NLB w/Layer3 Switch

 
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malb2318
Guest
Posted: Thu Nov 10, 2005 9:50 am    Post subject: NLB w/Layer3 Switch Reply with quote
Is there any configuration that NLB will work with a layer 3 switch?

Thanks
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malb2318
Guest
Posted: Thu Nov 10, 2005 5:50 pm    Post subject: Re: NLB w/Layer3 Switch Reply with quote
Sorry, I'm trying to get rid of the port Flooding,
Right now I have 2 nodes, each with 2 nics, the cluster nics are plugged
into a hub which feeds into a Layer 3 switch, the mamangement nics go
directly into the Layer 3 switch, I've set the MaskSourceAddress to 0 on the
Nodes, The setup is exactly as explained in MS Article id 193602 with the
exception of the Switch being layer 3.

When only one node is joined to the cluster I can get to my web site, once
I load nlb on the second node my access gets sporatic, sometimes I can hit
it sometimes not.

I did read one article where it said I could put a Layer 2 switch between
the Cluster and Layer 3 switch, my problem is I do not control my network and
I don't know what it would take to get that done.

Thanks


"Neteng" wrote:

Quote:
I'm not sure what your ? is, but NLB works with L3 switches just fine.

"malb2318" <malb2318@discussions.microsoft.com> wrote in message
news:41229539-CB96-41DE-AB52-775D0749B826@microsoft.com...
Is there any configuration that NLB will work with a layer 3 switch?

Thanks



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Neteng
Guest
Posted: Thu Nov 10, 2005 5:50 pm    Post subject: Re: NLB w/Layer3 Switch Reply with quote
I'm not sure what your ? is, but NLB works with L3 switches just fine.

"malb2318" <malb2318@discussions.microsoft.com> wrote in message
news:41229539-CB96-41DE-AB52-775D0749B826@microsoft.com...
Quote:
Is there any configuration that NLB will work with a layer 3 switch?

Thanks
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Todd J Heron
Guest
Posted: Sun Nov 13, 2005 1:50 am    Post subject: Re: NLB w/Layer3 Switch Reply with quote
"malb2318" <malb2318@discussions.microsoft.com> wrote...
Quote:
Sorry, I'm trying to get rid of the port Flooding,
snipped


In unicast mode, each NLB node replaces its real (hard-coded) MAC address
with a new one (generated by the NLB software) and each node uses the same
MAC address. Because of this, a switch is not able to learn the port for the
NLB cluster MAC address and is forced to send the packets destined for the
MAC address to all ports to make sure it gets to the right destination.

In multicast mode, NLB adds a layer 2 MAC address to the NIC of each node.
Each node has two MAC addresses, it's real one and it's NLB generated one.
In this multicast mode, you can create static entries in the switch so that
it sends the packets only to members of the NLB cluster based on their real
(that is to say hard-coded) MAC addresses. So, you can set up a mapping of
the NLB MAC to the real MACs in the switch. If you don't create the static
entries, the result will cause switch flooding just like in unicast mode.

--
Todd J Heron, MCSE
Windows Server 2003/2000/NT; CCA
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This posting is provided "as is" with no warranties and confers no rights
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