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overrides (Enhanced Subscriber Management)

Syntax

Hierarchy Level

Description

Override the default configuration settings for the Junos OS enhanced subscriber management software for subscriber management.

Options

ra-initial-interval-max seconds

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

ra-initial-interval-min seconds

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.

Best Practice:

Always configure the value of ra-initial-interval-min to be less than or equal to the value of ra-initial-interval-max. If you configure the values to be the same, the initial router advertisement intervals are constant and not randomized.

  • Range: 1 through 16

ipoe-dynamic-arp-enable

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.

receive-gratuitous-arp

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.

The remaining statements are explained separately. Search for a statement in CLI Explorer or click a linked statement in the Syntax section for details.

Required Privilege Level

system—To view this statement in the configuration.

system-control—To add this statement to the configuration.

Release Information

Statement introduced in Junos OS Release 15.1R3.

ra-initial-interval-max and ra-initial-interval-min options added in Junos OS Release 18.2R1 on MX Series routers.

ipoe-dynamic-arp-enable and receive-gratuitous-arp options added in Junos OS Release 18.4R1 on MX Series routers.