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SonicOS Enhanced 4.0 Administrator Guide
For example, refer to the following figure which provides a bi-directional DSCP tag action.
HTTP access from a web-browser on 192.168.168.100 to the web-server on 10.50.165.2 will
result in the tagging of the inner (payload) packet and the outer (encapsulating ESP) packets
with a DSCP value of 8. When the packets emerge from the other end of the tunnel, and are
delivered to 10.50.165.2, they will bear a DSCP tag of 8. When 10.50.165.2 sends response
packets back across the tunnel to 192.168.168.100 (beginning with the very first SYN/ACK
packet) the Access Rule will tag the response packets delivered to 192.168.168.100 with a
DSCP value of 8.
This behavior applies to all four QoS action settings for both DSCP and 802.1p marking.
Explicit An explicit 802.1p tag
value can be
assigned (0-7) from a
drop-down menu that
will be presented.
An explicit DSCP tag value can be
assigned (0-63) from a drop-down
menu that will be presented.
If either the 802.1p or the DSCP
action is set to Explicit while the
other is set to Map, the explicit
assignment occurs first, and then
the other is mapped according to
that assignment.
Map The mapping setting
defined in the
Firewall > QoS
Mapping page will
be used to map from
a DSCP tag to an
802.1p tag.
The mapping setting defined in the
Firewall > QoS Mapping page will
be used to map from an 802.1 tag to
a DSCP tag. An additional checkbox
will be presented to Allow 802.1p
Marking to override DSCP values.
Selecting this checkbox will assert
the mapped 802.1p value over any
DSCP value that might have been set
by the client. This is useful to override
clients setting their own DSCP CoS
values.
If Map is set as the action on both
DSCP and 802.1p, mapping will
only occur in one direction: if the
packet is from a VLAN and arrives
with an 802.1p tag, then DSCP
will be mapped to the 802.1p tag;
if the packet is destined to a
VLAN, then 802.1p will be
mapped to the DSCP tag.
Action 802.1p (layer 2 CoS) DSCP (layer 3) Notes