3com 3031 Instruccion De Instalación
Routing Management Policy
465
In a complicated Internet as shown in , the numbers in each network indicate its
network address. The router R8 is connected with three networks, so it has three
IP addresses and three physical ports. Its routing table is shown in the figure
below:
network address. The router R8 is connected with three networks, so it has three
IP addresses and three physical ports. Its routing table is shown in the figure
below:
Figure 122 Routing table
A router supports the configuration of static route as well as a series of dynamic
routing protocols such as RIP, OSPF, IS-IS and BGP. Moreover, a router in operation
can automatically obtain some direct routes according to interface state and user
configuration.
routing protocols such as RIP, OSPF, IS-IS and BGP. Moreover, a router in operation
can automatically obtain some direct routes according to interface state and user
configuration.
Routing Management
Policy
Policy
You can manually configure a static route to a certain destination, or configure the
interaction between dynamic routing protocol and other routers in the network
and find route via routing algorithm. The static routes configured by the user are
managed together with the dynamic routes discovered by the routing protocol in
the router. The static routes and the routes learned or configured by different
routing protocols can also be shared among routing protocols.
interaction between dynamic routing protocol and other routers in the network
and find route via routing algorithm. The static routes configured by the user are
managed together with the dynamic routes discovered by the routing protocol in
the router. The static routes and the routes learned or configured by different
routing protocols can also be shared among routing protocols.
Routing Protocols and
Route Discovery
Preference
Different routing protocols (including static routes) may discovery 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 the current route to a specific
destination. Thus, each of these routing protocols (including static routes) is
assigned with a preference. When there are multiple routing information sources,
the route learned 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 discovered by them are shown in
Table 537. In the table, “0” represents a directly connected route, and “255”
represents a route from an unknown source.
to the same destination, but not all these routes are optimal. In fact, at a certain
moment, only one routing protocol can determine the current route to a specific
destination. Thus, each of these routing protocols (including static routes) is
assigned with a preference. When there are multiple routing information sources,
the route learned 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 discovered by them are shown in
Table 537. In the table, “0” represents a directly connected route, and “255”
represents a route from an unknown source.
10.0.0.0
11.0.0.0
12.0.0.0
13.0.0.0
14.0.0.0
15.0.0.0
16.0.0.0
R8
2
10.0.0.1
1
11.0.0.1
3
13.0.0.4
R2
R3
R5
R6
R7
R1
R4
10.0.0.2
16.0.0.3
16.0.0.1
16.0.0.2
13.0.0.3
15.0.0.1
15.0.0.2
14.0.0.1
14.0.0.2
13.0.0.2
13.0.0.1
12.0.0.1
12.0.0.2
12.0.0.3
Routing table of Router R8
Destination
Network
10.0.0.0
10.0.0.0
Nexthop
Interface
10.0.0.1
2
11.0.0.0
11.0.0.1
1
12.0.0.0
11.0.0.2
2
11.0.0.2
13.0.0.0
13.0.0.4
3
14.0.0.0
13.0.0.2
3
15.0.0.0
10.0.0.2
2
16.0.0.0
10.0.0.2
2