3Com 4007, Руководство по внедрению, Страница: 391 / 684

Routing Policies
391
Creating RIP Routing
Policies
To set a routing policy, you need to know the following parameters:
■
Policy type — The determination whether to accept a route into the
routing table (import) or advertise a route from the routing table
(export)
■
Source address — The routing device that is sending the route to
your module
■
Route address
— The actual device IP address of the route origin
■
Route subnet mask — The subnet mask of the device IP address of
the route origin
■
IP interface — The IP interface on your module that the route is
coming in on
■
Policy action — The determination whether to accept or reject the
route
■
Metric adjustment — The determination to increase or decrease the
route metric (the number of hops) for the route
■
Administrative weight — The level of importance of this policy: 1 is
low priority, 16 is high priority
The policy takes effect on the selected interfaces only if the origin
protocol matches the protocol that is enabled for the selected interfaces.
Sketch out a topology of your routers and the proposed routing policies
of each to get an understanding of how the routers work together and
how traffic flows.
Table 77 lists the import policies for Router B:
In this example, only routes 130.1.0.0 and 133.1.0.0 are accepted into
the routing table of Router B.
Table 77 Router B Routing Policies
Policy Type
Source
Address Route
Address Route Subnet
Mask
IP Interface Policy Action Metric Weight
Import 10.1.2.2 130.1.0.0 255.255.0.0 1 accept 1 1
Import 10.1.2.2 131.1.0.0 255.255.0.0 1 reject – 2
Import 10.1.2.2 132.1.0.0 255.255.0.0 1 reject – 1
Import 10.1.2.2 133.1.0.0 255.255.0.0 1 accept 1 2