Routing Protocols And Routing Priority; Load Sharing And Route Backup - H3C S5600 Series Operation Manual

Hide thumbs Also See for S5600 Series:

Table of Contents

Routing Protocols and Routing Priority

Different routing protocols may find different routes (including static routes) to the same destination.

However, not all of those routes are optimal. In fact, at a particular moment, only one protocol can

uniquely determine the current optimal routing to the destination. For the purpose of route selection,

each routing protocol (including static routes) is assigned a priority. The route found by the routing

protocol with the highest priority is preferred.

The following table lists some routing protocols and the default priorities for routes found by them:

Table 1-1 Routing protocols and priorities of their default route

The smaller the priority value, the higher the priority.

The priority for a direct route is always 0, which you cannot change. Any other type of routes can

have their priorities manually configured.

Each static route can be configured with a different priority.

Load sharing

A given routing protocol may find several routes with the same metric to the same destination, and if this

protocol has the highest priority among all the active protocols, these routes will be considered valid and

are used to forward packets, thus achieving load sharing.

Route backup

You can configure multiple routes to the same destination, expecting the one with the highest priority to

be the primary route and all the rest backup routes.

Route backup can help improve network reliability. Automatic switching can happen between the

primary route and a backup route.

Under normal circumstances, packets are forwarded through the primary route. When the primary route

goes down, the route with the highest priority among the backup routes is selected to forward packets.

Routing approach

Show Quick Links

Table of Contents