12-06-2010 09:12 AM - edited 03-06-2019 02:22 PM
Hi:
The UCS ecosystem leverages a port aggregation solution to chassis I/O, namely, the FEX modules.
The FEX modules are not fully featured switches. Nor do they possess any forwarding policy intelligence at all. Instead, the FEX modules deploy a "pinning" approach in which downlinks (those that face the blade server's NIC's, LOMs, mezzanine cards) are mapped to an uplink port (those that face a 6100 Fabric Interconnect) to form what can be described as an aggregator group.
The result is a simplified approach to blade I/O in which the traffic patterns are predictable and failover is deterministic. Moreover, there is no need to configure STP because the ports are uplinked in a manner as to preclude any possibility of a bridging loop.
This having been said, is there some merit to the argument that this port aggregation design places a hole in the middle of a QoS deployment since the scheduling of packets on the uplink ports facing the 6100 Fabric Interconnect is not performed in a manner that recognizes priority?
To elaborate a bit more, one can have a VMware deployment and leverage NetIOC or perhaps configure QoS on a 1000v switch (whose uplink ports are mapped to a port on the Palo VIC) and configure QoS on the VIC, and then on the 6100 Fabric Interconnect. But, since the FEX is not scheduling traffic to the 6100 Fabric Interconnect according to any priority, the QoS deployment has a hole in the middle, so to speak.
Thoughts?
12-06-2010 04:59 PM
Jonny boy?? Where you at, son?
Edison, que pasa, papi? Donde estas?
Mr. Burts! Where art thou?
Peter Paluch, where are you, my good man?
Giuseppe, dove sei, professore?
Tennis anyone? :-)
12-07-2010 07:48 AM
Sorry Victor - I haven't done any DCN deployment to respond intelligently to your post.
12-07-2010 07:53 PM
No problem, buddy. Hope all is well wih you...
12-08-2010 04:47 AM
I moved this thread to the UC board.
https://supportforums.cisco.com/thread/2056571
Please go there to answer.
Thanks
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