R21xx-HP FlexFabric 11900 Layer 3 IP Services Configuration Guide

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Verifying the configuration
To verify NLB load sharing, enable the FTP server function of Server A and Server B. Host A and Host B
send requests to the virtual IP address, and each of them logs in to a different server.
To verify NLB redundancy, disable the network interface card of Server A. Host A and Host B send
requests to the virtual IP address, and both log in to the FTP server on Server B.