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LACP bonding between servers

Posted on 2013-01-28
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Last Modified: 2016-11-23
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I have a few XenServer and QuantaStor hosts that need redundant paths to a central switch. After the latest update to XenServer 6.1 the default of active-active source level balancing is not an option anymore - simply put, I can't afford any more mistakes with redundancy.

2 NICs in each server labeled Gb1 and Gb2
2 Dell 2808 labeled SW1 and SW2
Gb1 of each server connects to SW1, and Gb2 of each server connects to SW2

Then unconfigured ports 7,8 of SW1 and7,8 of SW2 trunk to unconfigured ports 1,2 and 3,4 respectively to a Cisco SRW2048 - the central switch.

Redundancy between XenServer and QuantaStor hosts is important because iSCSI is not fault-tolerant. I also have storage level replication between the primary and secondary iSCSI initiators for near continuous data protection, so having a highly available network is necessary to prevent these systems from breaking. I would like to simulate a switch failure by unplugging either of the Dell 2808 and not have interruption between the virtual machines and shared storage.

So, about this LACP - how do I enable and configure bonding between host server - Dell 2808 - Cisco SRW2048 in example listed above?
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Question by:fibrewire
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by:fibrewire
ID: 38829227
Apparently switches do not generally allow for cross-switch bonding. The switches need to be stacked when connections can move between the switches (switches will get temporarily very confused otherwise), or only use one switch. Since I wanted to use Dell 2808 switches, this won't work. This only applies for active/active mode; in active/passive mode, only one link is used at a time.

Oh well, thanks anyway. Any further information would be appreciated.
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pergr earned 500 total points
ID: 38830088
You are correct, the two physical switches needs to be one logical switch for LACP/LAG to work.

I recommend you to have a look at the Juniper EX3300 or EX4200, virtual chassis, which is Juniper's name for what you call stacking.
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by:pergr
pergr earned 500 total points
ID: 38830092
By the way, you can put up to 10 of those switches into one single virtual chassis - so it is unlikely that you will need any other "central switch".
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