H3C Technologies H3C S7500E Series Switches - Manual (Page 361)

12-4
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.
If all the 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 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.
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
Define an IPv6 prefix list
Identified by name, each IPv6 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 IPv6 prefix list is
passed, and the routing information will not go to the next item.
Follow these steps to define an IPv6 prefix list:
To do… Use the command… Remarks
Enter system view system-view —
Define an IPv6 prefix list
ip ipv6-prefix ipv6-prefix-name [ index index-number ]
{ deny | permit } ipv6-address prefix-length
[ greater-equal min-prefix-length ] [ less-equal
max-prefix-length ]
Required
Not defined by default.