overrides (Enhanced Subscriber Management)

Force the output of the show arp command to display the IP address by the hostname of each device.

Specify the high end of the range from which the router randomly selects an interval for sending the first three unsolicited IPv6 router advertisement messages. You must also configure the ra-initial-interval-min option.

• Range: 1 through 16

Specify the low end of the range from which the router randomly selects an interval for sending the first three unsolicited IPv6 router advertisement messages. You must also configure the ra-initial-interval-max option.

• Range: 1 through 16

Enable dynamic ARP to 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.

Enable the router to 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 when it determines this address is different from the cache entry.

This situation occurs when an IPv4 address is moved to a different device. The device broadcasts a gratuitous ARP reply packet with its MAC address as the source MAC address. When the receive-gratuitous-arp option is configured, the router compares the MAC addresses and updates the cache to associate the IPv4 address with the new MAC address.

If the receive-gratuitous-arp option is not configured, the router does not accept the gratuitous ARP request or reply packet and cannot quickly learn about the new address. Instead, the original dynamic ARP entry in the cache eventually times out. Before deleting the entry, the router sends an ARP request for the target IP address. The client responds with the new MAC address. This delay in learning about the new address means there is a period during which the MAC address in the ARP cache does not match the address in the new device’s NIC.