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тАО09-07-2009 04:47 AM
тАО09-07-2009 04:47 AM
Flex-10/FlexNIC and MAC addresses
We successfully use FlexNIC - we see 8 NIC's per server in Virtual connect and in Windows, and we can allocate bandwidth for NIC in VC manager
Question:
I just see Jarkko K. answer here:
http://forums13.itrc.hp.com/service/forums/questionanswer.do?threadId=1350456
and I understand from the answer that Virtual connect defined MAC addresses must be used for Flex-10/FlexNIC
We use static, factory-default MAC addresses in VC domain and it's work too.
So, question is: is it really required to use Virtual connect defined MAC addresses for Flex-10/FlexNIC using ? Is it's described in any manual/white paper ?
Thanks !
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тАО09-07-2009 05:23 AM
тАО09-07-2009 05:23 AM
Re: Flex-10/FlexNIC and MAC addresses
There are scenarios when you have more than one enclosure with VC and you start to move blades between them where you can result in two servers having the same mac address on one or more NICs.
If you use VC defined and you use a different defined range for each enclosure then then this will not happen.
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тАО09-08-2009 12:15 AM
тАО09-08-2009 12:15 AM
Re: Flex-10/FlexNIC and MAC addresses
http://h20000.www2.hp.com/bc/docs/support/SupportManual/c01608922/c01608922.pdf
it says on the top of page 13 that you should get 8 factory-assigned MAC addresses on a Flex-10 capable server.
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тАО09-08-2009 12:46 AM
тАО09-08-2009 12:46 AM
Re: Flex-10/FlexNIC and MAC addresses
As mentioned above there is a simple scenario that results in two servers having the same MAC address (for one or more NICs) if you use the physical MACs. Therefore I recommend to customers that they do not use physical MACs but VC predefined MACs.
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тАО09-08-2009 01:02 AM
тАО09-08-2009 01:02 AM
Re: Flex-10/FlexNIC and MAC addresses
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тАО09-08-2009 05:20 AM
тАО09-08-2009 05:20 AM
Re: Flex-10/FlexNIC and MAC addresses
You remove server A and plug it in with server C in enclosure 2. Now MACs from both A&C are now in the VC MAC pool for enclosure 2.
And if you have both enclosure 1 & 2 plugged into the same switch then you could have the same MAC on different servers connected to the same switch. Whoops!
If you stack the enclosures or use VCEM on both enclosures before the move then you will be able to avoid this problem.
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тАО09-08-2009 05:54 AM
тАО09-08-2009 05:54 AM
Re: Flex-10/FlexNIC and MAC addresses
(And sorry about the thread highjacking ;-)
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тАО09-08-2009 07:13 AM
тАО09-08-2009 07:13 AM
Re: Flex-10/FlexNIC and MAC addresses
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тАО09-09-2009 03:33 AM
тАО09-09-2009 03:33 AM
Re: Flex-10/FlexNIC and MAC addresses
A more compelling argument (which includes all of Adrians arguments as a subset) is that if you have a Server Blade fail (not unheard of, I'm told), then the VC MAC's (stored in the Blade Profile), allow the blade to be replaced with a completely new blade, without any need to mess with the network connectivity.
I personnally think this trumps all of the other considerations, (after all, it is what VC is all about!)
Dave.