3Com 10014299 manual Routing Protocol and Routing Priority

Routing Management Strategy 407

Figure 143 Routing table illustration

		16.0.0.1			16.0.0.3
15.0.0.2			16.0.0.0		R7	10.0.0.2
		R6
			16.0.0.2
15.0.0.0			R5	13.0.0.3	10.0.0.0
						2
15.0.0.1		13.0.0.2			10.0.0.1
R2			13.0.0.0		3	R8
	14.0.0.2			13.0.0.4	11.0.0.1	1
			13.0.0.1		11.0.0.0
14.0.0.0
			R 3
		R1	12.0.0.2	11.0.0.2
14.0.0.1

12.0.0.3	12.0.0.0	R4
		12.0.0.1

Routing table of Router R8

The network of The router where The port to
destination	the message is	be passed
host	transferred
10.0.0.0	Direct	2
11.0.0.0	Direct	1
12.0.0.0	11.0.0.2	1
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	10.0.0.2	2

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 3Com routers support both manual configuration of a static route to a specific

Strategydestination 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 Different routing protocols (including static routes) can find different routes to the Routing Priority 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

Routing Protocol or Type	Corresponding Routing Priority
Direct (Connected)	0
OSPF	10
STATIC	60
RIP	100
IBGP	130