This section describes the 7450 ESS or 7750 SR acting as a Broadband Subscriber Aggregator (BSA) with Layer 3 forwarding toward the network.
In an IES service, the system’s ARP table can be populated dynamically using entries in the DHCP lease state table (in turn, populated from snooping DHCP ACK messages (see DHCP Snooping)), and from static hosts defined on the SAP. In the router ARP table these are indicated with state managed.
If both a static host is created with the same IP and MAC address as an existing managed entry, creation fails and a trap is generated.
If a DHCP Lease needs to be populated with the same IP and MAC address as an existing static host entry, creation fails and a trap is generated.
No static-arp creation is possible when combined with arp-populate.