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xStack DES-3800 Series Layer 3 Stackable Fast Ethernet Managed Switch
216
• Packet Content Mask instructs the Switch to examine the packet header.
• IPv6 instructs the switch to examine the IPv6 address in each frame’s 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.
Replace DSCP (0-63)
Select this option to instruct the Switch to replace the DSCP value (in a packet that meets
the selected criteria) with the value entered in the adjacent field.
Offset
This field will allow users to examine any specified content up to 80 bytes within a packet
at one time and 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.
To view the settings of a previously correctly configured rule, click in the Access Rule Table to view the following
window: