3com DUA1750-2BAA01 Manual De Usuario

3Com Switch 8800 Configuration Guide 

Chapter 16  IP Routing Protocol Overview

 

16-4 

The Switch 8800 supports the configuration of a series of dynamic routing protocols 

such as RIP, OSPF, IS-IS and BGP, as well as the static routes. In addition, the running 

switch will automatically obtain some direct routes according to the port state and user 

configuration. 

For the Switch 8800, you can configure manually the static route to a specific 

destination, and configure dynamic routing protocol to interact with other routers on the 

network. The routing algorithm can also be used to discover routes. For the configured 

static routes and dynamic routes discovered by the routing protocol, the Switch 8800 

implements unified management. That is, the static routes configured by the user are 

managed together with the dynamic routes discovered by the routing protocol. The 

static routes and the routes learned or configured by different routing protocols can also 

be shared with each other. 

Different routing protocols (as well as the static configuration) may generate different 

routes to the same destination, but not all these routes are optimal. In fact, at a certain 

moment, only one routing protocol can determine a current route to a specific 

destination. Thus, each of these routing protocols (including the static configuration) is 

set with a preference, and when there are multiple routing information sources, the 

route discovered by the routing protocol with the highest preference will become the 

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

the higher the preference is) of the routes learned by them are shown in Table 16-1. 

In the table, 0 indicates a direct route. 255 indicates any route from unreliable sources. 

Table 16-1 Routing protocols and the default preferences for the routes learned by 

them 

DIRECT 0 

OSPF 10 

IS-IS 15 

STATIC 60 

RIP 100 

OSPF ASE 

150 

OSPF NSSA 

150 

IBGP 256 

EBGP 256