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DGS-3212SR Layer 3 Gigabit Switch

Creating an access profile is divided into two basic parts. First, an access profile must be created using the

create

access_profile

command. For example, if you want to deny all traffic to the subnet 10.42.73.0 to 10.42.73.255, you must first

create

an access profile that instructs the switch to examine all of the relevant fields of each frame:

create access_profile ip source_ip_mask 255.255.255.0 profile_id 1

Here we have created an access profile that will examine the IP field of each frame received by the switch. Each source IP
address the switch finds will be combined with the

source_ip_mask

with a logical AND operation. The

profile_id

parameter is

used to give the access profile an identifying number

−

in this case,

. The

deny

parameter instructs the switch to filter any

frames that meet the criteria

−

in this case, when a logical AND operation between an IP address specified in the next step and

the

ip_source_mask

match.

The default for an access profile on the switch is to

permit

traffic flow. If you want to restrict traffic, you must use the

deny

parameter.

Now that an access profile has been created, you must add the criteria the switch will use to decide if a given frame should be
forwarded or filtered. Here, we want to filter any packets that have an IP source address between 10.42.73.0 and 10.42.73.255:

config access_profile profile_id 1 add access_id 1 ip source_ip 10.42.73.1 deny

Here we use the

profile_id 1

which was specified when the access profile was created. The

add

parameter instructs the switch

to add the criteria that follows to the list of rules that are associated with access 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.

The

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.

Each command is listed, in detail, in the following sections.

NOTE:

As a stand-alone switch or as a master switch in a switch stack,

the switch number will be referred to as 15 for all configurations, graphs
and tables.

create access_profile

Purpose

Used to create an access profile on the switch and to define which
parts of each incoming frame’s header the switch will examine.
Masks can be entered that will be combined with the values the
switch finds in the specified frame header fields. Specific values
for the rules are entered using the

config access_profile

command, below.

Syntax

create access_profile [ethernet{ vlan | source_mac
<macmask> | destination_mac <macmask> | 802.1p |
ethernet_type}| ip { vlan | source_ip_mask <netmask> |
destination_ip_mask <netmask> | dscp | [ icmp {type |
code } | igmp {type } | tcp {src_port_mask <hex 0x0-
0xffff> | dst_port_mask <hex 0x0-0xffff>| flag_mask [all | {urg
| ack | psh | rst | syn | fin}]} | udp {src_port_mask <hex 0x0-
0xffff> | dst_port_mask <hex 0x0-0xffff>} | protocol_id
{user_mask <hex 0x0-
0xffffffff>} ]}|packet_content_mask{offset_0-15 <hex 0x0-
0xffffffff><hex 0x0-0xffffffff><hex 0x0-0xffffffff><hex 0x0-
0xffffffff> | offset_16-31 <hex0x0-0xffffffff><hex 0x0-

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