![]() The FI recieves the frame from the IOM and then determines where to send the frame. The IOM always forwards this packet to the FI it is connected too, and no switching is performed even if the destination happens to be another blade on the same chassis that is associated with the same fabric interconnect. This interface was configured in UCSM to be associated with either FI A or FI B (if we ignore fabric failover), and the packet is forwarded from the NIC to the IOM that is associated with the appropriate FI. The OS or hypervisor on the blade sends the frame out a single interface. Here is a simplified example of how a packet from one blade is forwarded to another blade: In your example it would be 3 hops in both modes. In both modes each IOM in each chassis functions only as a MUX and only connects to a single FI so all blade-to-blade communications will always travel from the chassis up to the fabric interconnect before any switching is performed and then get forwarded based on weather the destination is on the same FI or the other FI. End Host versus Switch mode does not affect the amount of hops.
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