Why does ifdown of an IPv6 alias tear all IPs off the interface?

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Issue

When utilizing ifdown to manage IPv6 alises on an interface, all IPs are removed from the specified interface. When using the ifconfig commands, the appropriate actions occur.

Environment

Red Hat Enterprise Linux (RHEL) 5
Red Hat Enterprise Linux (RHEL) 6
Red Hat Enterprise Linus (RHEL) 7 Beta

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