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Routing policy configuration task list
Complete the following tasks to configure a routing policy:
Task
Defining an extended community list
Defining filters
Prerequisites
Before configuring this task, you must determine IP-prefix list name, matching address range, and
extcommunity list sequence number.
Defining an IP-prefix list
Define an IPv4 prefix list
Identified by name, an IPv4 prefix list can comprise multiple items. Each item specifies a prefix range to
match and is identified by an index number.
An item with a smaller index number is matched first. If one item is matched, the IP prefix list is passed,
and the routing information will not go to the next item.
Follow these steps to define an IPv4 prefix list:
To do…
Use the command…
Remarks
Enter system view
system-view
—
Define an IPv4 prefix list
ip ip-prefix
ip-prefix-name
[
index
index-number
]
{
deny
|
permit
}
ip-address mask-length
[
greater-equal
min-mask-length
] [
less-equal
max-mask-length
]
Required
Not defined by default.
NOTE:
If all the items are set to the
deny
mode, no routes can pass the IPv4 prefix list. You must define the
permit
0.0.0.0 0
less-equal
32 item following multiple
deny
items to allow other IPv4 routing information to pass.
For example, the following configuration filters routes 10.1.0.0/16, 10.2.0.0/16, and 10.3.0.0/16, but
allows other routes to pass.
<Sysname> system-view
