Routing Management Policy - Huawei Quidway S3500 Series Operation Manual

Operation Manual - Routing Protocol
Quidway S3500 Series Ethernet Switches
R6
15.0.0.2
15.0.0.0
15.0.0.1
R2
14.0.0.2
14.0.0.0
14.0.0.1
R1
Figure 1-2 The routing table

1.2 Routing Management Policy

The Quidway S3500 Series Ethernet Switches support the configuration of a series of
dynamic routing protocols such as RIP, OSPF and BGP, 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.
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 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 1-1 Routing protocols and the default preferences for the routes learned by them
Routing protocol or route type
DIRECT
OSPF
16.0.0.1 16.0.0.3
16.0.0.0
16.0.0.2
R5
13.0.0.3
13.0.0.2
13.0.0.0
13.0.0.4
13.0.0.1
R3
12.0.0.2
12.0.0.3 12.0.0.1
12.0.0.0
Huawei Technologies Proprietary
Chapter 1 IP Routing Protocol Overview
R7
10.0.0.2
Routing table of Router R8
Destination
10.0.0.0
Network
10.0.0.0
2
10.0.0.1
11.0.0.0
3
R8
12.0.0.0
13.0.0.0
1
11.0.0.1
14.0.0.0
15.0.0.0
11.0.0.0
16.0.0.0
11.0.0.2
R4
The preference of the corresponding
0
10
1-4
Nexthop Interface
10.0.0.1 2
11.0.0.1 1
11.0.0.2 1
13.0.0.4 3
13.0.0.2 3
13.0.0.2 3
10.0.0.2 2
route