3Com 4500 PWR 26-PORT, 4500 PWR 50-PORT, 4500 50-PORT, 4500 26-PORT manual Description

IP Routing Policy Configuration Commands 171

index_number Identify an item in the prefix address list. The item with smaller index-number will be tested first.

permit Enter to specify the match mode of the defined address prefix list items as permit mode.

deny Enter to specify the match mode of the defined address prefix list items as deny mode.

network Enter the IP address prefix range (IP address). If it is 0.0.0.0 0, all the IP addresses are matched.

len Enter the IP address prefix range (mask length). If it is 0.0.0.0 0, all the IP addresses are matched.

greater_equal, less_equal The address prefix range [greater-equal, less-equal] to be matched after the address prefix network len has been matched. The meaning of greater-equalis "larger than or equal to" , and the meaning of less-equalis "less than or equal to". The range is len <= greater-equal <= less-equal <= 32. When only greater-equalis used, it denotes the prefix range [greater-equal, 32]. When only less-equalis used, it denotes the prefix range [len, less-equal].

Description

Use the ip ip-prefixcommand to configure an address prefix list or one of its items.

Use the undo ip ip-prefixcommand to delete an address prefix list or one of its items.

By default, there’s no address prefix list.

The 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", i.e. passing an item means passing the filtering of this address prefix list. Not passing the filtering of any item means not passing the filtration of 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 only matches the default route.

Example

The prefix address list of this address indicates to match the bits 1 to 8 and the bits 17 to 18 for filtering the IP address with the bits 1 to 8 and the bits 17 to 18 of the specified IP network segment 10.0.192.0.

<4500>system-view

System View: return to User View with Ctrl+Z.

[4500]ip ip-prefix p1 permit 10.0.192.0 8 greater-equal 17

less-equal 18