[c-nsp] Microsoft multicasted cluster vs. Cisco IOS

[christian.macnevin at uk.bnpparibas.com]

I'm told by someone who purports to know a bit about Microsoft that 
microsoft clustering service != Network Load Balancing. Don't
ask me, I just poke the routers.

The tech note seems to be specific to NLB. So does it hold true for both 
services? Anyone?

Cheers
Christian 





Internet
olivier.dauby at scarlet.be
Sent by: cisco-nsp-bounces at puck.nether.net
04/11/2005 17:11

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cisco-nsp
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Subject
Re: [c-nsp] Microsoft multicasted cluster vs. Cisco IOS






Brett Looney wrote:
> At 00:44 5/11/2005, you wrote:
>
>>The Microsoft cluster is supposed to listen on a virtual ip address
>>using a multicast mac address. Local users see the virtual ip of the
>>cluster (10.106.49.6) with a mac address 03:BF:0A:6A:31:06. I'm
>>already a bit confused here since I expected the multicast mac
>>address to begin with 0x01 instead of 0x03.
>>
>>The routers also seem to be confused, they have been unable to learn
>>this mac address as you can see in this 'show arp' output:
>>
>>I quickfixed this with a dirty 'arp' command on both routers:
>>
>>        arp 10.106.49.6 03BF.0A6A.3106 arpa
>
>
> Yeah - there is a MS technote about this (can't find it right
> now...). Routers won't learn a multicast MAC address for a unicast IP
> address. You've done exactly what they suggest...
>
> B.

Oh I see,

http://www.microsoft.com/technet/prodtechnol/windowsserver2003/library/ServerHelp/fdcd461f-0fd6-4164-928f-6f1841fdc27d.mspx


Thanks for your support,

O.

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