Indicates the source of this IP address.
other(1) indicates the source of this IP address is
not one of the following types.
configured(2) indicates this IP address is configured
via this policy group and IP address configuration.
dot1x(3) indicates this IP address is added by
802.1x feature.
nac(4) indicates this IP address is added by
NAC (network admission control) feature.
webAuth(5) indicates this IP address is added
by Web-Proxy Authentication feature.
macAuth(6) indicatest this IP address is added
by MAC Authentication Bypass feature.