Pilz PSSnet SHL 8T MRP User Manual
Page 83
QoS/Priority
PSSnet SHL - Web- based Interface
Pilz GmbH & Co. KG, Felix- Wankel Str. 2, 73760 Ostfildern
5.1 Global
83
X
“trustDot1p”
The device prioritizes received packets that contain VLAN tag informa-
tion (assigning them to a traffic class - see
„802.1D/p Mapping“
).
The device prioritizes received packets that do not contain any VLAN
tag information (assigning them to a traffic class - see
„Entering the
port priority“
) according to the port priority of the receiving port .
X
“trustIpDscp”
The device prioritizes received IP packets (assigning them to a traffic
class - see
„IP DSCP mapping“
) according to their DSCP value.
The device prioritizes received packets that are not IP packets
(assigning them to a traffic class - see
„Entering the port priority“
)
according to the port priority of the receiving port .
For received IP packets:
The device also performs VLAN priority remarking.
In VLAN priority remarking, the device modifies the VLAN priority of
the IP packets if the packets are to be sent with a VLAN tag
(see on
page
91 „VLAN Static“)
.
Based on the traffic class to which the IP packet was assigned (see
above), the device assigns the new VLAN priority to the IP packet in
accordance with
table
41
.
Example: Received IP packet with a DSCP value of 32 (cs4) is
assigned to traffic class 2 (default setting). The packet was received at
a port with port priority 2. Based on
table
41
, the VLAN priority is set
to
4.
Traffic class
New VLAN priority
when receiving port
has an even port priority
New VLAN priority
when receiving port
has an odd port priority
0
0
1
1
2
3
2
4
5
3
6
7
Table 25: VLAN priority remarking