H3C S9500 Series Operation Manual page 220

Routing switches

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Operation Manual – Routing Protocol

H3C S9500 Series Routing Switches

The H3C S9500 Series Routing Switches (hereinafter referred to as S9500 series)

support 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.

1.2 Routing Management Policy

For S9500 series, 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 S9500 series

implement 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.

1.2.1 Routing Protocols and the Preferences of the Corresponding Routes

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 1-1.

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

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

Routing protocol or route type

Chapter 1 IP Routing Protocol Overview

The preference of the corresponding

Chapters

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S9505 S9508 S9512