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Routing Management Strategy 407
Figure 143 Routing table illustration
3Com routers support not only static route configuration, but also dynamic
routing protocols such as RIP, OSPF and BGP. Depending on the interface status
and user configuration, a router can automatically obtain some direct routes
during their operation.
Routing Management
Strategy
3Com routers support both manual configuration of a static route to a specific
destination and dynamic routing protocol configuration which finds the route with
the routing algorithm to interact with other routers in the network. Both static
routes configured by the user and dynamic routes found by the routing protocol
are uniformly administered in the router.
Routing Protocol and
Routing Priority
Different routing protocols (including static routes) can find different routes to the
same destination, but not all these routes are optimal. In fact, at a certain
moment, the current route to a destination is determined only by a unique routing
protocol. As a result, every routing protocol (including static route) is assigned a
priority. When there are multiple route information sources, the route found by
higher-priority routing protocols become the current route. The routing protocols
and their default routing priorities (the less the value, the higher the priority) are
shown in the
Table 465.
Here, 0 stands for a directly connected route and 255 stands for any route from
unknown sources or terminals.
Table 465 Routing Protocol and Routing Priority
The network of
destination
host
the message is
The router where
transferred
The port to
be passed
10.0.0.0
Direct
2
11.0.0.0
Direct
1
12.0.0.0
11.0.0.2
13.0.0.0
Direct
3
14.0.0.0 13.0.0.2
3
15.0.0.0
10.0.0.2
2
16.0.0.0
2
15.0.0.0
16.0.0.0
10.0.0.0
13.0.0.0
12.0.0.0
14.0.0.0
11.0.0.0
R4
R1
3
R2
R6
R5
R7
R8
1
11.0.0.2
2
12.0.0.1
12.0.0.2
12.0.0.3
14.0.0.1
14.0.0.2
13.0.0.1
13.0.0.4
11.0.0.1
3
10.0.0.1
10.0.0.2
16.0.0.3
16.0.0.1
15.0.0.2
15.0.0.1
13.0.0.2
16.0.0.2
13.0.0.3
Routing table of Router R8
10.0.0.2
1
R
Routing Protocol or Type Corresponding Routing Priority
Direct (Connected) 0
OSPF 10
STATIC 60
RIP 100
IBGP 130