Configuration Guide User guide
FastIron Configuration Guide 1965
53-1002494-02
QoS overview
FIGURE 220 Determining a packet trust level - FastIron X Series devices
Packet received on
ingress port
Trust the DSCP-
CoS-mapping or
the DSCP-marking
Ye s
No
Use the default
priority of 0
Trust the port’s
default priority
Trust the priority
of the static
MAC entry
Trust the 802.1p
CoS value
Ye s
Ye s
Ye s
No
No
No
Trust the
DSCP/ToS value
Ye s
No
Does the
port have Trust
DSCP enable?
Does the
MAC address
match a static
entry?
Is the packet
tagged?
Does the
port have a
default
priority?
Does the
packet match an
ACL that defines
a priority?