Operation Manual – IPv4 Routing
H3C S3610&S5510 Series Ethernet Switches
Chapter 6 Routing Policy Configuration
6-4
6.3 Defining Filtering Lists
6.3.1 Prerequisites
Before configuring this task, you need to decide on:
z
IP-prefix list name
z
Matching address range
z
Extcommunity list sequence number
6.3.2 Defining an IPv4 Prefix List
Identified by name, each IPv4 prefix list can comprise multiple items. Each item
specifies a matching address range in the form of network prefix identified by index
number.
During matching, the system compares the route to each item identified by index
number in the ascending order. If one item matches, the route passes the IP-prefix list,
without needing to match against 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
] {
permit
|
deny
}
ip-address mask-length
[
greater-equal
min-mask-length
]
[
less-equal
max-mask-length
]
Required
Not defined by
default
Note:
If all items are set to the
deny
mode, no routes can pass the IPv4 prefix list. Therefore,
you need to define the
permit
0.0.0.0 0
less-equal
32 item following multiple
deny
mode 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
[Sysname] ip ip-prefix abc index 10 deny 10.1.0.0 16
[Sysname] ip ip-prefix abc index 20 deny 10.2.0.0 16
[Sysname] ip ip-prefix abc index 30 deny 10.3.0.0 16
[Sysname] ip ip-prefix abc index 40 permit 0.0.0.0 0 less-equal 32