Routing Protocols And Routing Priority; Load Balancing And Route Backup - HP 4800G Series Configuration Manual

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Routing Protocols and Routing Priority

Different routing protocols may find different 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 route 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

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

Routing approach

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.

IPv4 and IPv6 routes have their own respective routing tables.

Load Balancing

In multi-route mode, a routing protocol can be configured with multiple equal-cost routes to the same

destination. These routes have the same priority and will all be used to accomplish load balancing if

there is no route with a higher priority available. 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 routes for load balancing.

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