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3Com Switch 7750 Series
Command Reference Guide – Routing Protocol Chapter 6 IP Routing Policy Configuration Commands
6-18
Parameter
ip-prefix-name: Name of address prefix list, containing 1 to 19 characters. It identifies
an address prefix list uniquely.
index-number: Identifier of an item in the prefix address list. The item with a smaller
index-number will be tested first.
permit: Specifies the match mode of the defined address prefix list items as permit
mode. If the permit mode is specified and the IP address to be filtered is in the
ip-prefix range specified by the item, the item is filtered through and the next item is
not tested. If the IP address to be filtered is not in the ip-prefix range specified by the
item, the next item is tested
deny: Specifies the match mode of the defined address prefix list items as deny mode.
If the deny mode is specified and the IP address to be filtered is in the ip-prefix range
specified by the item, the item is not filtered through and the next item is not tested;
otherwise, the next item is tested.
network: IP address prefix range (IP address). If it is specified as 0.0.0.0 0, all the IP
addresses are matched.
len: IP address prefix range (mask length). If it is specified as 0.0.0.0 0, all the IP
addresses are matched.
greater-equal, less-equal: Address prefix range [greater-equal, less-equal] to be
matched after the address prefix network len has been matched. The meaning of
greater-equal is "greater than or equal to" , and the meaning of less-equal is "less
than or equal to". The range is len <= greater-equal <= less-equal <= 32. When only
greater-equal is used, it denotes the prefix range [greater-equal, 32]. When only
less-equal is used, it denotes the prefix range [len, less-equal].
Description
Use the ip ip-prefix command to configure an address prefix list or one of its items.
Use the undo ip ip-prefix command to delete an address prefix list or one of its
items.
An address prefix list is used for IP address filtering. An address prefix list may
contain several items, and each item specifies one address prefix range. The
inter-item filtering relation is "OR". That is, passing an item means filtering through
this address prefix list. Not filtering through any item means not filtering through this
prefix address list.
The address prefix range may contain two parts, which are determined by len and
[greater-equal, less-equal], respectively. If the prefix ranges of these two parts are
both specified, the IP to be filtered must match the prefix ranges of these two parts.
If you specify network len as 0.0.0.0 0, it matches the default route only.