Subscriber Services: ARP enhancements for subscriber management

The following ARP enhancements are supported only for framed routes on dynamic VLANs:

• Dynamic layer 2 MAC address resolution works for network (non-host) IPv4 framed routes. The non-host framed route is coupled with the dynamic Layer 2 address associated with a host route.
• The router can compare the source MAC address received in a gratuitous ARP request or reply packet with the value in the ARP cache. The router updates the cache with the received MAC address if it determines this address is different from the cache entry.
• Dynamic ARP can resolve the MAC address for IPv4 framed host (32-bit) routes. By default, the framed route is permanently associated with the source MAC address received in the packet that triggered creation of the dynamic VLAN.