D-Link DES-3250TG Command Line Interface Reference Manual page 276

DES-3250TG Layer 2 Fast Ethernet Switch User's Guide
profile 1. For each rule entered into the access profile, you can assign
an access_id that both identifies the rule and establishes a priority
within the list of rules. A lower access_id gives the rule a higher
priority. In case of a conflict in the rules entered for an access profile,
the rule with the highest priority (lowest access_id) will take
precedence.
The ip parameter instructs the switch that this new rule will be applied
to the IP addresses contained within each frame's header. source_ip
tells the switch that this rule will apply to the source IP addresses in
each frame's header. Finally, the IP address 10.42.73.1 will be
combined with the source_ip_mask 255.255.255.0 to give the IP
address 10.42.73.0 for any source IP address between 10.42.73.0 to
10.42.73.255.
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