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Posted by Angler on June 7, 2005, 11:12 pm
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Sarah Tanembaum wrote:
> Michael Roberts wrote:
>
>> Morten Rydahl Nielsen wrote:
>>
>>>
>>>> How to enable network load balancing support on Passport 8600 Core
>>>> Switch and Baystack 5510 Access Switch? Is it global or it can be
>>>> enabled just for a specific VLAN(s) or port(s)?
>>>>
>>>
>>> Hi.
>>> The short version is: Do NOT use MS load balancing !
>>> It is an abomination, that violates all normal rules for layer 2
>>> networking.
>>> The only way i have managed to get it to work, is by using an
>>> ethernet hub.
>>> So what's the point?
>>> And believe me, it's not for lack of trying!
>>>
>>> If you realy need load balancing, get an Alteon switch and use that.
>>>
>>> Regards
>>> MRN
>>>
>>>
>> I believe there is a feature that can be enabled in the 3.7.7 8600
>> code that will assist in MS Load Balancing operations. I do not have
>> the release notes in front of me, so I can not comment on the specifics.
>>
>> We ran MS LB on our 8600s and BPS2ks for a number of applications. We
>> had to create VLANs for each set of load balanced front-end nodes to
>> control the level of broadcasts. It really was not so bad, except
>> that it chewed up a lot of IP space. Once we figure out how the
>> system 'tricked' the switches into flooding inbound requests, it
>> really was not difficult to troubleshoot.
>>
>> Since then, we have converted everything over to Alteon based
>> solutions, which is far more flexible than the MS solution.
>>
>> -mike
>
> Perhaps you can point me in the right direction to get this MS NLB to
> work. I did create a VLAN, say, vlan 1234 with port 1/3 & 1/4 port as
> its members on an access switch instead on the Passport directly.
>
> Next, how do you trick the switch to be able to handle the MS NLB?
>
> Thanks
Copy and paste from the Managing Platform Operations PDF (Part No.
315545-C Rev 00)...
Microsoft* Network Load Balancing Support
Passport 8000 Series switch software allows you to choose whether ARP
entries for multicast MAC addresses are associated with the VLAN or the
port on which it was learned.
This enhancement is useful if multiple endstations/servers are sharing a
multicast MAC address as is the case with certain Microsoft network load
balancing applications, wherein the traffic is flooded to the VLAN to
ensure that every endstation using this virtual multicast MAC address is
receiving a copy of the stream.
This feature is disabled by default.
To enable or disable NLBS support, enter the CLI command:
config ip arp multicast-mac-flooding <enable|disable>
Note: This option is not dynamic. That is, if the setting of this
feature is changed, it will not dynamically reprogram all previously
learned ARP entries from multicast MAC addresses.
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