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Firewall Settings > QoS Mapping
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SonicOS 5.8.1 Administrator Guide
The following table describes the behavior of each action on both methods of marking:
Action 802.1p (layer 2 CoS) DSCP (layer 3) Notes
None When packets match-
ing this class of traffic
(as defined by the
Access Rule) are sent
out the egress inter-
face, no 802.1p tag
will be added.
The DSCP tag is explicitly set (or
reset) to 0.
If the target interface for this class
of traffic is a VLAN subinterface,
the 802.1p portion of the 802.1q
tag will be explicitly set to 0. If this
class of traffic is destined for a
VLAN and is using 802.1p for prior-
itization, a specific Access Rule
using the Preserve, Explicit, or
Map action should be defined for
this class of traffic.
Preserve Existing 802.1p tag
will be preserved.
Existing DSCP tag value will be pre-
served.
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 Fire-
wall Settings > QoS
Mapping page will be
used to map from a
DSCP tag to an
802.1p tag.
The mapping setting defined in the
Firewall Settings > 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 over-
ride 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 from the 802.1p tag; if
the packet is destined to a VLAN,
then 802.1p will be mapped from
the DSCP tag.