Configuring IPv4 floating static routes helps to implement route backup and improve network reliability.
If there is a route to a specific destination, you can configure a static route with a low preference to implement route backup, which improves network reliability. This static route with a lower preference is called a floating static route. It is activated to forward packets only when the optimal route fails. When the optimal route recovers, this static route becomes inactive.
Floating static routes are used as follows:
Two static routes with the same destination address but different priorities are configured, and the one with the lower priority functions as a backup.
When a route of a dynamic routing protocol to a destination address exists, you can configure a static route to the destination address for data service forwarding temporarily if the dynamic routing protocol restarts.
Before configuring IPv4 floating static routes, configure link layer protocol parameters and IP addresses for interfaces and ensure that the status of the link layer protocol on the interfaces is Up.
The system view is displayed.
Run ip route-static ip-address { mask | mask-length } { nexthop-address | interface-type interface-number [ nexthop-address ] | vpn-instance vpn-instance-name nexthop-address } [ preference preference | tag tag ]* [ description text ]
An IPv4 floating static route is configured in public network.
Run ip route-static vpn-instance vpn-source-name destination-address { mask | mask-length } { nexthop-address | interface-type interface-number [ nexthop-address ] | vpn-instance vpn-instance-name nexthop-address } [ preference preference | tag tag ] * [ description text ]
An IPv4 floating static route is configured in VPN network.
Run ip route-static topology topology-name ip-address { mask | mask-length } { nexthop-address | interface-type interface-number [ nexthop-address ] } [ preference preference | tag tag ] * [ description text ]
An IPv4 floating static route is configured in a non-base topology instance.
The preference parameter specifies a route priority. The greater the value, the lower the priority. Therefore, make sure that the priority value of the floating static route is greater than that of the optimal route.
The configuration is committed.
After the configuration is complete, check the configuration results.
Run the display ip routing-table ip-address [ mask | mask-length ] command to check configurations about the optimal IPv4 static route to the specified destination network segment.
Run the display current-configuration | include static command to check the configurations about the current static route.