Command Reference Guide

172 ● ip ip-prefix 3Com Router 5000 Family and Router 6000 Family
Command Reference
ip ip-prefix
Purpose 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.
Syntax ip ip-prefix ip-prefix-name [ index index-number ] { permit | deny }
network len [ greater-equal greater-equal | less-equal less-equal ]
undo ip ip-prefix ip-prefix-name [ index index-number | permit | deny ]
Parameters ip-prefix-name
Specifies an address prefix list name. It identifies one
address prefix list uniquely.
index-number
Identifies an item in the prefix address list. The item
with smaller index-number will be tested first.
permit
Specifies the match mode of the defined address prefix
list items as permit mode. In the permit mode, if the IP
address to be filtered is in the defined range, it will not
be tested by the next node. Otherwise, it has to go on
with the test.
deny
Specifies the match mode of the defined address prefix
list items as deny mode. In the deny mode, the IP
address in the defined range cannot pass the filtering
and is refused to go on with the next test. Otherwise,
it will have the next test.
network
IP address prefix range (IP address). If it is 0.0.0.0 0, all
the IP addresses are matched.
len
IP address prefix range (mask length). If it is 0.0.0.0 0,
all the IP addresses are matched.
greater-equal, less-equal
Specifies the 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 indicates
the prefix range [
greater-equal, 32]. When only
less-equal is used, it indicates the prefix range [
len,
less-equal
].
Example Configure an address prefix list named p1. It permits the routes with the mask of 17
or 18 bits long and in network segment 10.0.192.0.8 to pass.
[3Com ] ip ip-prefix p1 permit 10.0.192.0 8 greater-equal 17 less-equal
18