Allied Telesis AT-FS970M Series - Manual (Page 1704)

Chapter 99: Quality of Service (QoS) Commands
1704
MATCH TCP-FLAGS
Syntax
match tcp-flags ack|fin|rst|syn|urg
Parameters
ack
Indicates the Acknowledge TCP flag.
fin
Indicates the Finish TCP flag.
rst
Indicates the Reset TCP flag.
syn
Indicates the Synchronize TCP flag.
urg
Indicates the Urgent TCP flag.
Mode
Class Map mode
Description
Use this command to set a TCP flag as a matching criteria for a class
map. A TCP flag is a control bit. If a packet contains a TCP header, it
matches the criteria based on the FLAGS field within the header.
You can only add one TCP flag to a MATCH TCP-FLAGS command.
However, you can add multiple MATCH TCP-FLAGS commands to the
same class map, each containing a different TCP flag. Multiple commands
that apply to the same class map are filtered with an AND operand. For
example, the following command matches packets that contain the
Synchronize TCP flag:
match tcp-flags syn
In comparison, the following command matches packets that contain the
Acknowledge TCP flag:
match tcp-flags ack