3com 5500-ei pwr Instruccion De Instalación

 

1-4 

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 

DIRECT 

0 

OSPF 10 

STATIC 60 

RIP 100 

OSPF ASE 

150 

OSPF NSSA 

150 

UNKNOWN 255 

 

z 

The smaller the priority value, the higher the priority. 

z 

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

have their priorities manually configured. 

z 

Each static route can be configured with a different priority. 

 

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. 

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.