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CLI-based Configuration Guide - IP Unicast Routing

AR100, AR120, AR150, AR160, AR200, AR1200, AR2200, AR3200, and AR3600 V200R009

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Load Balancing and Route Backup

Load Balancing and Route Backup

Load Balancing Among Static Routes

To implement load balancing, specify the same preference for multiple routes to the same destination.

Figure 2-3 Load Balancing Among Static Routes

As shown in Figure 2-3, 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

To implement route backup, specify different preferences for multiple routes to the same destination.

Figure 2-4 Route backup

As shown in Figure 2-4, there are two static routes with different preferences from RouterA to RouterC. Static route B with next hop RouterB has a higher preference. The link that static route B belongs to functions as the active link. Static route D with next hop RouterD has a lower preference. The link that static route D belongs to 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 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.
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Updated: 2019-05-17

Document ID: EDOC1000174069

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