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Re: Ethernet link aggregation and Lights Out management?

Title: Re: Ethernet link aggregation and Lights Out management?
The official word from Apple is that on an Xeon Xserve, LOM and Link Aggregation do not work. Their recommendation is to add a third-party Ethernet card, most likely from Small Tree, as a workaround. Interestingly, a fix was not mentioned in the 10.4.9 release notes.

Jeff

on 3/12/07 6:41 PM, Nathan Zamprogno at email@hidden wrote:

At 10:39 PM +1100 1/6/07, Nathan Zamprogno wrote:
I will shortly be installing a new Intel XServe, and I would like to do link aggregation (802.3ad) on both the Ethernet interfaces.

Does anyone know if this has any implications for the Lights Out management feature of these new XServes? The LOM documentation makes mention of both eth0 and eth1 being assigned additional static IP addresses not related to the "main" IP address of the server, so does LOM just pick up the fact that the interfaces are bonded and run with it? Keep in mind that the switch that these two interfaces will be plugged into will also need to be set to 802.3ad mode, so there will be no ability to address the XServe except through the bonded interface.

Hope someone can shed some light. Thanks.

I think the answer to your question is going to have more to do with your switch than the XServe so you should be addressing this question to the vendor of that switch rather than making us try and guess for whomever that may be.
--
-dhan
------------------------------------------------------------------------
Dan Shoop                                                   AIM: iWiring

No, I think the answer to this question goes beyond the make of switch I plug it into. The Lights Out configuration screen in Server Monitor lets you set the IP for LOM for each of the two physical ethernet interfaces (listed as Port1 and Port2, but presumably == en0 and en1). However, I have created an aggregated interface called bond1 and enabled LACP (Link Aggregation) on the two ports of my switch (A Procurve 6108) to double-barrel my server bandwidth.

I can see my Intel XServe by using 127.0.0.1 in Server Monitor locally, but the XServe cannot be seen by SM at all at the bond0 IP (in the 192.168.x.x range), nor at the "alternate" IP set in the LOM setup page for Port1 or Port2. Sure, the switch uses the standard LACP standard procedures to fall back to a single port in the event of one interface failing, but Apple's implementation may be fundamentally incompatible with LACP.

I believe LOM is broken for users using link aggregation. At the very least, there is no word from Apple confirming or denying this issue, or to supply any guidance.

 
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