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Configuration Guide - IP Unicast Routing

S7700 and S9700 V200R011C10

This document describes IP Unicast Routing configurations supported by the switch, including the principle and configuration procedures of IP Routing Overview, Static Route, RIP, RIPng, OSPF, OSPFv3, IS-IS(IPv4), IS-IS(IPv6), BGP, Routing Policy ,and PBR, and provides configuration examples.
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Load Balancing and Route Backup

Load Balancing and Route Backup

Load Balancing Among Static Routes

To implement load balancing, set the same preference value for different routes to the same destination, as shown in Figure 2-3.

Figure 2-3  Load balancing among static routes

Both static routes from SwitchA to SwitchC have a preference value of 60 and are stored in the routing table.

Route Backup

To implement route backup, set different preference values for different routes to the same destination, as shown in Figure 2-4.

Figure 2-4  Route backup

There are two static routes with different preference values from SwitchA to SwitchC. Static route B with next hop SwitchB has a smaller value, which signifies a higher preference. The link associated with static route B functions as the active link. Static route D with next hop SwitchD has a lower preference. The link associated with static route D functions as the standby link, providing link backup if a fault occurs on the active link.
  • In normal situations, the link associated with static route B is the active link. Static route B is included in the routing table and is used to forward data. Static route D is not included in the routing table and is not used to forward data.
  • If a fault occurs on the active link, static route B is deleted from the routing table. Static route D is added to the routing table and is used to forward data.
  • When the fault on the active link is resolved, static route B is reactivated, and is once again used to forward data. Static route D is deleted from the routing table and functions as the backup route.
  • Static routes used for backup are also known as floating static routes.

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Updated: 2019-04-01

Document ID: EDOC1000178324

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