Hi all,
I'm reading the documentation on ISSU with the Nexus 5020, and I'm a little unclear. So, the data plane continues forwarding on the 5020 switches while the control plane is upgrading, and this is non-disruptive.
The FEX modules are upgraded in a rolling fashion, and this is also considered non-disruptive. Do the FEX modules continue to pass traffic on the data plane similar to the switch, or is the upgrade considered non-disruptive because it is "rolling"? ie: If I have single homed servers to a FEX, will they be taking a hit while the FEX upgrades in an ISSU scenario?
ISSU Support For Cisco Nexus 2000 Series Fabric Extenders
Cisco Nexus 2000 Series Fabric Extenders act as line cards to Cisco Nexus 5000 Series switches. The fabric extenders add flexibility to datacenter networking infrastructure by decoupling the physical and logical (Layer 2) topology, reducing the operation expense by lowering management and troubleshooting points, and building a larger layer 2 fabric that is loop-free, with a single layer of switching.
The ISSU process initiated on the Cisco Nexus 5000 Series switches upgrades the entire access layer including the switch and the FEXs that are connected to the switch.
An ISSU first upgrades the switches. Once the switch is operational with the upgraded software, the FEX's are upgraded. This upgrade of the FEX is done in a rolling fashion, one FEX at a time. This upgrade on the Fabric Extenders is non-disruptive, similar to the upgrade of the switch.
Thanks!
