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Инструкция по эксплуатации Страница: 108

D-Link DES-3552 Инструкция по эксплуатации онлайн [108/260] 40412

DES-3550 Fast Ethernet Layer 2 Switch

To set the Access Rule for the Packet Content Mask, adjust the following parameters and click Apply.

Parameter Description

Profile ID

Type in a unique identifier number for this profile set. The number is used to set the

relative priority for the profile. Priority is set relative to other profiles where the lowest

profile ID has the highest priority. If a conflict occurs among configured access rules,

the profile ID establishes relative priority of the rules. The value can be set from 1 to

255 however there is a limit to the total number of profiles tht can be created.

Mode

Select Permit to specify that the packets that match the access profile are forwarded by

the Switch, according to any additional rule added (see below).

Select Deny to specify that packets that do not match the access profile are not

forwarded by the Switch and will be filtered.

Access ID (1-65535)

Type in a unique identifier number for this access or use Auto Assign.

Type

Selected profile based on Ethernet (MAC Address), IP address or Packet Content

Mask.

•

Ethernet instructs the Switch to examine the layer 2 part of each packet

header.

IP instructs the Switch to examine the IP address in each frame's header.

Packet Content Mask instructs the Switch to examine the packet header.

Priority (0-7)

This parameter is specified if you want to re-write the 802.1p default priority previously

set in the Switch, which is used to determine the CoS queue to which packets are

forwarded to. Once this field is specified, packets accepted by the Switch that match

this priority are forwarded to the CoS queue specified previously by the user.

Replace Priority with − Click the corresponding box if you want to re-write the 802.1p

default priority of a packet to the value entered in the Priority (0-7) field, which meets

the criteria specified previously in this command, before forwarding it on to the specified

CoS queue. Otherwise, a packet will have its incoming 802.1p user priority re-written to

its original value before being forwarded by the Switch.

For more information on priority queues, CoS queues and mapping for 802.1p, see the

QoS section of this manual.

Offset

This field will instruct the Switch to mask the packet header beginning with the offset

value specified:

•

value (0-15) - Enter a value in hex form to mask the packet from the beginning

of the packet to the 16th byte.

value (16-31) - Enter a value in hex form to mask the packet from byte 16 to

byte 31.

value (32-47) - Enter a value in hex form to mask the packet from byte 32 to

byte 47.

value (48-63) - Enter a value in hex form to mask the packet from byte 48 to

byte 63.

value (64-79) - Enter a value in hex form to mask the packet from byte 64 to

byte 79.

Port

The user may set the Access Rule to Permit or Deny on a per-port basis by entering a

port number in this field. Any other specified criteria applies as well.

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