H3C Technologies H3C S6300 Series Switches - Manual (Page 36)

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Figure 4 Priority mapping procedure for an Ethernet packet
For information about priority marking, see " Configuring priority marking ."
Priority mapping configuration tasks
You can modify priority mappings by modifying priority mapping tables, priority trust mode on a port,
and port priority.
To configure priority mapping, perform the following tasks:
Tasks at a glance
(Optional.) Configuring a priority map
Which priority is
trusted on the port?
Receive a
packet on a port
Use port priority
as 802.1p priority
for priority
mapping
No
Look up dot1p-dp and
dot1p-lp mapping
tables
Mark the packet
with local
precedence or drop
precedence
Is the packet
802.1q tagged?
Yes
DSCP in packets
Look up dscp-dp,
dscp-dot1p, and
dscp-dscp mapping
tables
802.1p in
packets
Mark the packet
with 802.1p priority,
drop precedence,
and new DSCP
precedence
Look up dot1p-lp
mapping table
Mark the packet with
local precedence
Look up dot1p-dp and
dot1p-lp mapping
tables
Mark the packet
with local
precedence or drop
precedence
Schedule the packet
according to its local
and drop precedence
Use port priority
as 802.1p priority
for priority
mapping
Look up dot1p-dp and
dot1p-lp mapping
tables
Mark the packet
with local
precedence or drop
precedence
Port priority
Does the packet match
conditions for local
precedence or drop
precedence marking?
Mark it with local
precedence or drop
precedence
Yes
No