07-25-2012 03:19 AM - edited 03-01-2019 10:31 AM
With the vmware switches vDS or vSS, I see many designs are using the Active-passive approach for uplink NIC-teaming, i.e one vmnic is active going to fabric A, and one vmnic is passive going to fabric B. This is configured in vSphere.
Se this article: http://bradhedlund.com/2010/09/15/vmware-10ge-qos-designs-cisco-ucs-nexus/
Is it correct we cannot set up such a scheme with the 1000V? All the network config is done on the 1000V, and as far as I know, we can only setup the uplink in these 3 modes:
1. LACP 2. vPC-Host Mode 3. vPC-Host Mode with Mac Pinning
and all of them are "active-active" based.
Message was edited by: Atle Dale
Solved! Go to Solution.
07-26-2012 05:50 AM
Yes. All uplinks are used. Each VM virtual interface is pinned to one of the uplinks. If one uplink should fail, all pinned interfaces get dynamically re-pinned to remaining uplinks. A mac address will only be see on a single interface at a time. This is how MAC pinning avoids STP loops.
Robert
07-27-2012 03:25 PM
Hello Atle,
UCS C-Series connected directly to a switch would support LACP for the 1000V.
With the B-Series and UCSM-mode C-Series, there is no switching logic built-in to the Fabric Interconnects when running in End-Host Mode. So, the Nexus 1000V would not be able to negotiate LACP properly with them.
I hope that helps,
Trevor
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07-25-2012 06:59 AM
Atle,
The only uplink channeling method supported with the 1000v + UCS is Mac Pinning. You can definately make use of all uplinks in this regard.
Regards,
Robert
07-26-2012 12:01 AM
ok, but MAC-pinning is a sort of active-active, isn't it?
07-26-2012 05:50 AM
Yes. All uplinks are used. Each VM virtual interface is pinned to one of the uplinks. If one uplink should fail, all pinned interfaces get dynamically re-pinned to remaining uplinks. A mac address will only be see on a single interface at a time. This is how MAC pinning avoids STP loops.
Robert
07-27-2012 12:27 AM
ok, and it is built-in failover-redundancy, so this is pretty good. Do you know why Cisco does not support a setup with UCS and active-mode (LACP)? Or if it will be supported in the future, because clearly LACP is better, because of better bandwidt usage.
07-27-2012 03:25 PM
Hello Atle,
UCS C-Series connected directly to a switch would support LACP for the 1000V.
With the B-Series and UCSM-mode C-Series, there is no switching logic built-in to the Fabric Interconnects when running in End-Host Mode. So, the Nexus 1000V would not be able to negotiate LACP properly with them.
I hope that helps,
Trevor
======================================================================================
If my answers have been helpful in any way, please rate accordingly. Thanks!
07-28-2012 05:00 AM
You may want to consult the "Nexus 1000v Port-Channel Best Practices" document for topologies and sample configurations.
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