10G Core Routing Switch User Manual
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Host route: The destination is a host In addition, according to whether the network of the destination host is
directly connected to the router, there are the following types of routes:
Direct route: The router is directly connected to the network where the destination locates.
Indirect route: The router is not directly connected to the network where the destination locates.
In order to limit the size oft the routing table, an option is available to set a default route.All the packets that fail to
find the suitable entry will be forwarded through this default route.
In a complicated Internet as shown in the following figure, the number in each network is the network address. The
router R8 is connected with three networks, so it has three IP addresses and three physical ports, and its routing table
is shown in the diagram below:
Figure 12-2
The routing table
7.2.
Routing Management Policy
This Series Routing Switches support the configuration of a series of dynamic routing protocols such as RIP, OSPF , as
well as the static routes. The static routes configured by the user are managed together with the dynamic routes as
detected by the routing protocol. The static routes and the routes learned or configured by different routing protocols
can also be shared with each other.
7.2.1.
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 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, the higher the preference is) of the routes learned by them are shown in the following table.
Table 12-1
Routing protocols and the default preferences for the routes learned by them
