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Deployment Guide
A more desirable configuration, particularly for 1-Gbps hosts, spreads the load of the virtual machines across both
uplinks by using source MAC address hashing. When VMware VMotion is initiated, it will be contending for bandwidth
among a fewer number of virtual machines.
Figure 4.
Two NICs with a Single PortChannel Using vPC-HM
Four-NIC Design Examples
A four-NIC design offers additional flexibility by allowing the segregation of data traffic from all other traffic types. This
design uses two PortChannels in vPC-HM. Each PortChannel consists of one link to each access switch. Source-
based hashing is still required. Figure 5 shows an example of this configuration: two PortChannels using vPC-HM,
each with a link to both access switches. Each vPC-HM subgroup consists of a single link. There is no need to run
EtherChannel on the access switches.
© 2009 Cisco Systems, Inc. All rights reserved. This document is Cisco Public Information.
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