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HP 6125G Configuration Manual: Priority Trust Mode On A Port; Priority Mapping Procedure

Hp 6125g & 6125g/xg blade switches acl and qos configuration guide-r2103.
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Priority trust mode on a port

The priority trust mode on a port decides which priority is used for priority mapping table lookup. Port
priority was introduced to use for priority mapping in addition to priority fields carried in packets. The HP
Blade 6125 Switch Series provides the following priority trust modes:
Using the 802.1p priority carried in packets for priority mapping.
Using the DSCP carried in packets for priority mapping.
The priority mapping procedure varies with the priority modes. For more information, see the subsequent
section.

Priority mapping procedure

On receiving an Ethernet packet on a port, the switch marks the scheduling priorities (local precedence
and drop precedence) for the Ethernet packet. This procedure is done according to the priority trust
mode of the receiving port and the 802.1q tagging status of the packet, as shown in
Figure 6 Priority mapping procedure for an Ethernet packet
Use the port
priority as the
802.1p priority of
the packet
Look up the
dot1p-dp and
dot1p-lp tables
Mark the packet
with local
precedence and
drop precedence
The priority mapping procedure shown in
marking is configured, the switch performs priority marking before priority mapping. The switch then uses
the re-marked packet-carried priority for priority mapping or directly uses the re-marked scheduling
Receive a
packet on a port
Which priority is
trusted on the
port?
802.1p in
packets
N
Is the packet
802.1q tagged?
Y
Look up the
dot1p-dp and
dot1p-lp tables
Mark the packet
with local
precedence and
drop precedence
Schedule the packet
according to its local
precedence and drop
precedence
Figure 6
DSCP in packets
Look up the
dscp-dp, dscp-
dot1p, and dscp-
dscp tables
Mark the packet
with 802.1p
priority, drop
precedence, and
new DSCP
precedence
Look up the
dot1p-lp table
Mark the packet
with local
precedence
applies in the absence of priority marking. If priority
26
Figure
6.

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