R21xx-HP FlexFabric 11900 Layer 3 IP Services Configuration Guide

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[Switch] interface vlan-interface 2
[Switch-Vlan-interface2] ddns apply policy oray.cn fqdn whatever.gicp.cn
After the preceding configuration is completed, Switch notifies the DNS server of its new domain
name-to-IP address mapping through the PeanutHull server, whenever the IP address of Switch changes.
Therefore, Switch can always provide Web service at whatever.gicp.cn.