Before an IP-only static host can forward or receive traffic, the MAC of the host must be learned by the BNG. The learned MAC is used to fill in the anti-spoof entry for the static host. Table: Methods to learn IP-only static host MAC addresses summarizes the different methods that the BNG could use to learn the IP only static host MAC address.
| Number of hosts on SAP | IPv4 static host | IPv6 numbered static host | IPv6 prefix only host (unnumbered) | DS host |
|---|---|---|---|---|
1 |
Host’s ARP Triggered SHCV Data packet OAM SHCV |
Auto populate RS and NS MAC GUA based NS Triggered SHCV Data packet OAM SHCV |
Auto populate RS and NS MAC GUA based NS Data packet |
IPv4: With IPv6 static host MAC (if available) and mechanisms listed for IPv4 static host IPv6 numbered host: With IPv4 static host MAC (if available) and mechanisms listed for IPv6 numbered static host IPv6 prefix only host: With IPv4 static host MAC (if available) and mechanism listed for IPv6 prefix only host |
N |
Host’s ARP Triggered SHCV Data packet OAM SHCV |
GUA based NS SHCV Data packet OAM SHCV |
GUA based NS Data packet |
IPv4: Through IPv6 static host MAC (if available) and mechanism listed for IPv4 static host IPv6 numbered host: With IPv4 static host MAC (if available) and mechanism listed for IPv6 numbered static host With prefix only host: Via IPv4 static host MAC (if available) and mechanism listed for IPv6 prefix only host |
IP-only static hosts without a MAC address are put into a ‟non-forwarding” state and are not able to send or receive traffic. The BNG must populate the MAC address using the methods described in the table above to put the host into a ‟forwarding” state. If the IPv4 static host sends an ARP, then the IPv4 address along with Ethernet header source MAC can populate the IP-only host MAC address. For IPv6, the subscriber must send in a NS using the GUA to allow the BNG to resolve the MAC address. If the IP-only host is an IPv6 prefix, NS using the GUA can also resolve the static host MAC address, provided that the GUA is within the subnet of the prefix. n IPv6 prefix host can only have one MAC association, multiple bridged hosts using a single IPv6 prefix is not supported. To support multiple bridge hosts on a SAP, individual /128 host must be configured along with enabling ipoe-bridge-mode.