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CX11x, CX31x, CX710 (Earlier Than V6.03), and CX91x Series Switch Modules V100R001C10 Configuration Guide 12

The documents describe the configuration of various services supported by the CX11x&CX31x&CX91x series switch modules The description covers configuration examples and function configurations.
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Applications

Applications

This section describes the applicable scenario of Static Routes.

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 7-7 Load Balancing Among Static Routes

As shown in Figure 7-7, 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 7-8 Route backup

As shown in Figure 7-8, 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.

Application of the Static Default Route

When the destination IP address is set to all 0s, a default route is configured. The default route can be automatically generated by a routing protocol or manually configured. The default route manually configured simplifies network configuration. If the destination address of a packet fails to match any entry in the routing table, the router selects the default route to forward the packet.

Figure 7-9 Networking diagram of static routes

As shown in Figure 7-9, if no static default route is configured, you need to configure static routes destined for networks 3, 4, and 5 on RouterA, configure static routes destined for networks 1 and 5 on RouterB, and configure static routes destined for networks 1, 2, and 3 on RouterC. In this way, RouterA, RouterB, and RouterC can communicate with each other.

The next hop of the packets sent by RouterA to networks 3, 4, and 5 is RouterB. Therefore, a default route configured on RouterA can replace the three static routes destined for networks 3, 4, and 5 in the preceding example. Similarly, only a default route from RouterC to RouterB can replace the three static routes destined for networks 1, 2, and 3 in the preceding example.

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Updated: 2019-08-09

Document ID: EDOC1000041694

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