ANF – Assigned Number Field
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ANF – Assigned Number Field

In MPLS and other VPN based networks VPN-IPv4 is used to ensure addressing spaces within the VPN do not cross. The VPN-IPv4 address is defined through the RD. The RD comprises of the AF (Administrator Field) and the ANF. The ANF defines the VPN-IPv4 variable and is populated by the service provider.

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