Switch Command Reference Guide

ip ospf policy define
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ip ospf policy define
Defines import and export OSPF routing policies.
Valid Minimum Abbreviation
ip o po def
Important Considerations
■
The system assigns an index number to each policy and takes into
account all route policies, Routing Information Protocol (RIP) and OSPF,
that are set on the system.
■
There are certain conditions associated with import and export
policies. See the “OSPF Routing Policies” section in the OSPF chapter
of your product’s
Implementation Guide
for more information.
■
Your system has one unified IP routing table. Routing policies allow
you to control the flow of information among the network, the
protocols, and the routing tables on your system.
■
There are two classes of routing policies:
■
Import policies
— Control which OSPF non-self-originated
external routes are stored in the routing table. OSPF import policies
control only what the local router uses. They do not affect the
propagation of non-self-originated external routes to other routers.
■
Export policies
— Used on OSPF boundary routers to control
which self-originated external routing updates are placed in the
link-state database for propagation over the network. In this way,
export policies govern what other routers learn with regard to the
local boundary router’s self-originated information.
■
You can set up an IP RIP or OSPF import or export policy to accept or
advertise the default route, as long as the default route exists in the
routing table. When you define a policy, you are always prompted for
the route subnet mask after the route address, even though you
specify the wildcard route address of 0.0.0.0.
Specify a route subnet mask as follows:
■
If you want the wildcard subnet mask for all routes, use the default
subnet mask (0.0.0.0).
■
If you want the default route (not all routes), use
255.255.255.255.
■
For more information about IP routing policies, see the
Implementation Guide
for your system.