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Load Balancing and Route Backup
Load Balancing
If the same preference is specified for multiple routes to the same destination, load balancing is implemented.
In Figure 2-4, there are two static routes with the same preference from RouterA to RouterC. The two routes are stored in the routing table and used to forward data.
Route Backup
If different preferences are specified for multiple routes to the same destination, route backup is implemented.
In Figure 2-5, there are two static routes with different preferences from RouterA to RouterC. Static route B with the next hop RouterB has a higher preference, and its link therefore functions as the active link. Static route D with the next hop RouterD has a lower preference, and its link therefore functions as the standby link.
- In normal situations, static route B is activated, and the active link forwards data. Static route D is not shown in the routing table.
- If a fault occurs on the active link, static route B is deleted from the routing table. Static route D, functioning as the backup route, is activated, and the standby link forwards data.
- When the active link restores, static route B is activated again, and the active link forwards data. Static route D is deleted from the routing table and functions as the backup route. Static route D is also called a floating static route.