Ip Routing Policy Configuration Tasks - Huawei Quidway S3900 Series Operation Manual

Operation Manual – Routing Protocol
Quidway S3900 Series Ethernet Switches-Release 1510
II. ACL
The S3900 series support four types of ACLs: advanced, basic, user-defined, and
layer 2 ACLs.
Normally, a basic ACL is used to filter routing information. You can specify a range of
IP addresses or subnets when defining a basic ACL so as to match the destination
network segment addresses or next-hop addresses of routing information. If an
advanced ACL is used, the specified range of source addresses will be used for
matching.
For ACL configuration, see the QoS/ACL configuration section of this manual.
III. ip-prefix
ip-prefix plays a role similar to ACL. But it is more flexible than ACL and easier to
understand. When ip-prefix is applied to filtering routing information, its matching
object is the destination address information field of routing information. Moreover,
with ip-prefix, you can use the gateway option to specify that only routing information
advertised by certain routers will be received.
An ip-prefix is identified by its ip-prefix name. Each ip-prefix can include multiple items,
and each item, identified by an index-number, can independently specify the match
range in network prefix form. An index-number specifies the matching sequence in
the ip-prefix.
During the matching, the router checks items identified by index-number in ascending
order. Once an item is met, the ip-prefix filtering is passed and no other item will be
checked.

5.2 IP Routing Policy Configuration Tasks

Table 5-1 IP routing policy configuration tasks
Route-policy configuration
ip-prefix configuration
Displaying IP routing policy
Configuration task
Defining a route-policy
Defining if-match clauses
and apply clauses
Huawei Technologies Proprietary
5-2
Chapter 5 IP Routing Policy Configuration
Description
Required
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Related
section
5.3.2
5.3.3
5.4
5.5