Configuring the Advertisement of IPv4 ARP Vlink Direct Routes

Context

After a device's sub-interfaces or VLANIF interfaces have static ARP entries configured or dynamically learn ARP entries, the device generates a type of 32-bit host route according to ARP entries if the arp direct-route enable command is executed to configure the ARP module of the device to report IPv4 ARP Vlink direct routes to the RM module. This type of 32-bit host route is called IPv4 ARP Vlink direct route.

By default, IPv4 ARP Vlink direct routes are only used to guide local traffic forwarding. To control the routing table size and ensure routing table stability, devices are prohibited from redistributing these direct routes into dynamic routing protocols. In some situations, however, devices need to perform operations based on specific routes. For example, a device needs to direct remote traffic for different users using different export policies. Subsequently, the device needs to redistribute IPv4 ARP Vlink direct routes into dynamic routing protocols and advertises them to the remote end.

You can use a route-policy to filter IPv4 ARP Vlink direct routes to be advertised so that only the routes matching the route-policy can be advertised. This operation can control the routing table size and implement precise control over data traffic.

Only the S5720-EI, S5720-HI, S5730-HI, S5731-H, S5731-S, S5731S-H, S5731S-S, S5732-H, S6720-EI, S6720-HI, S6720S-EI, S6730-H, S6730S-H, S6730-S, and S6730S-S support the configuration of the advertisement of IPv4 ARP Vlink direct routes.

Pre-configuration Tasks

Before configuring the advertisement of IPv4 ARP Vlink direct routes, set link layer protocol parameters and assign IP addresses to interfaces to ensure that the status of the link layer protocol of the interfaces is Up.

Procedure

Run system-view
The system view is displayed.
Run arp vlink-direct-route advertise [ route-policy route-policy-name ]
The advertisement of IPv4 ARP Vlink direct routes is configured.

By default, a device does not advertise IPv4 ARP Vlink direct routes.

You can specify the route-policy route-policy-name parameter in the command to filter the IPv4 ARP Vlink direct routes to be advertised.

Currently, apply clauses cannot be used to set route attributes for the routes that match the specified route-policy.

IPv4 ARP Vlink direct routes need to be redistributed into the routing tables of dynamic routing protocols on the device running dynamic routing protocols before these routes are advertised by dynamic routing protocols.

Verifying the Configuration

After the configuration of the advertisement of IPv4 ARP Vlink direct routes is complete, you can run the display ip routing-table verbose command to check information about IPv4 ARP Vlink direct routes.