H3C S3600 Series Operation Manual page 286

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Table of Contents

Operation Manual – Routing Protocol

H3C S3600 Series Ethernet Switches-Release 1510

route. Routing protocols and their default route preferences (the smaller the value is,

the higher the preference is) are shown in Table 1-1.

In the table, "0" is used for directly connected routes, and "255" is used for routes from

untrusted sources.

Table 1-1 Routing protocols and corresponding route preferences

Routing protocol or route type

Except for direct routing, you can manually configure the preferences of various

dynamic routing protocols as required. In addition, you can configure different

preferences for different static routes.

1.2.2 Traffic Sharing and Route Backup

I. Traffic sharing

The S3600 series support multi-route mode, allowing the configuration of multiple

routes that reach the same destination and have the same preference. The same

destination can be reached through multiple different routes, whose preferences are

equal. When there is no route with a higher preference to the same destination, the

multiple routes will be adopted. Then, the packets destined for the same destination

will be forwarded through these routes in turn to implement traffic sharing.

II. Route backup

The S3600 series support route backup. When the primary route fails, the system

automatically switches to a backup route to improve network reliability.

To achieve route backup, you can configure multiple routes to the same destination

according to actual situation. One of the routes has the highest preference and is

called primary route. The other routes have descending preferences and are called

backup routes. Normally, the router sends data through the primary route. When line

failure occurs on the primary route, the primary route will hide itself and the router will

choose the one whose preference is the highest among the remaining backup routes

as the path to send data. In this way, the switchover from the primary route to a

Chapter 1 IP Routing Protocol Overview

Preference of the corresponding route