Operation Manual – Routing Protocol
H3C S3600 Series Ethernet Switches-Release 1510 Chapter 5
IP Routing Policy Configuration
5-1
Chapter 5 IP Routing Policy Configuration
Note:
When running a routing protocol, the Ethernet switch also functions as a router. The
words “router” and the router icons covered in the following text represent routers in
common sense and Ethernet switches running a routing protocol.
5.1 IP Routing Policy Overview
When a router distributes or receives routing information, it may need to implement
some policies to filter the routing information, so as to receive or distribute only the
routing information meeting given conditions. A routing protocol (RIP, for example)
may need to import the routing information discovered by other protocols to enrich its
routing knowledge. While importing routing information from another protocol, it
possibly only needs to import the routes meeting given conditions and set some
attributes of the imported routes to make the routes meet the requirements of this
protocol.
For the implementation of a routing policy, you need to define a set of matching rules
by specifying the characteristics of the routing information to be filtered. You can set
the rules based on such attributes as destination address and source address of the
information. The matching rules can be set in advance and then used in the routing
policies to advertise, receive, and import routes.
The S3600 series provide three kinds of filters (Route-policy, ACL, and ip-prefix),
which can be referenced by routing protocols. The following sections introduce these
filters.
I. Route-policy
A route policy is used to match some attributes with given routing information and the
attributes of the information will be set if the conditions are satisfied.
A route policy can comprise multiple nodes. Each node is a unit for matching test, and
the nodes will be matched in the order of their node numbers. Each node comprises a
set of if-match and apply clauses. The if-match clauses define the matching rules.
The matching objects are some attributes of routing information. The relationship
among the if-match clauses for a node is “AND”. As a result, a matching test against
a node is successful only when all the matching conditions specified by the if-match
clauses in the node are satisfied. The apply clauses specify the actions performed
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