HPE FlexNetwork 5510 HI Series

25
Figure 4 Priority mapping process for an Ethernet packet
A switch marks a received MPLS packet with a scheduling priority based on the priority trust mode
and the packet EXP value, as shown in Figure 5.
Which priority is
trusted on the port?
Receive a packet
on a port
Use port priority as
802.1q priority for
priority mapping
No
Look up dot1p-dp
and dot1p-lp
mapping tables
Mark the packet
with local
precedence or drop
priority
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
priority
Schedule the packet based
on its local precedence or
drop priority
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
priority
Port priority
Should the
packet be marked with
local precedence or drop
priority?
Mark it with local
precedence or drop
priority
Yes
No