Huawei Quidway NetEngine80E Configuration Manual page 802

HUAWEI NetEngine80E/40E Router
Configuration Guide - IP Routing
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Issue 02 (2014-09-30)
For details on ACL configurations, see the HUAWEI NetEngine80E/40E Router
Configuration Guide - IP Services.
An ACL can be used as a matching condition of a route-policy or used in the filter-
policy { acl-number | acl-name acl-name } export [ protocol [ process-id ] ] command or
the peer { group-name | ipv4-address } filter-policy { acl-number | acl-name acl-name }
export command.
Configure an IP prefix list.
An IP prefix list is a type of filter used to filter routes based on destination addresses. An
IP prefix list is identified by its name. An IP prefix list can be used flexibly to implement
accurate filtering. For example, it can be used to filter a route or routes to a network segment.
If a large number of routes that do not have the same prefix need to be filtered, configuring
an IP prefix list to filter the routes is very complex.
An IP prefix list can be used as a matching condition of a route-policy or used in the filter-
policy ip-prefix ip-prefix-name export [ protocol [ process-id ] ] command or the peer
{ group-name | ipv4-address } ip-prefix ip-prefix-name export command.
1. Run:
system-view
The system view is displayed.
2. Run:
ip ip-prefix ip-prefix-name [ index index-number ] { permit | deny } ip-
address mask-length [ match-network ] [ greater-equal greater-equal-
value ] [ less-equal less-equal-value ]
An IPv4 prefix list is configured.
match-network is used to filter routes to a specified IP address and can be configured
only when ipv4-address is 0.0.0.0. For example, the ip ip-prefix prefix1 permit
0.0.0.0 8 command filters all routes with mask length 8, while the ip ip-prefix prefix1
permit 0.0.0.0 8 match-network command filters all routes to the IP address range
from 0.0.0.1 to 0.255.255.255.
The mask length range can be specified as mask-length <= greater-equal-value <=
less-equal-value <= 32. If only greater-equal is specified, the prefix range is [greater-
equal-value, 32]. If only less-equal is specified, the prefix range is [mask-length, less-
equal-value].
An IPv4 prefix list is identified by its name, and each IP prefix list can contain multiple
entries. Each entry is identified by an index number, and can specify a matching range
in the form of a network prefix uniquely. An IPv4 prefix list named abcd is used as
an example.
#
ip ip-prefix abcd index 10 permit 1.0.0.0 8
ip ip-prefix abcd index 20 permit 2.0.0.0 8
During route matching, the system checks the entries by index number in ascending
order. If a route matches an entry, the route will not be matched with the next entry.
The NE80E/40E denies all unmatched routes by default. If all entries in an IPv4 prefix
list are in deny mode, all routes will be denied by the IPv4 prefix list. In this case, you
must define an entry permit 0.0.0.0 0 less-equal 32 after the entries in deny mode to
allow all the other IPv4 routes to by permitted by the IPv4 prefix list.
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