Configuration Guide User guide

FastIron Configuration Guide 1967
53-1002494-02
QoS overview
FIGURE 221 Determining a packet trust level - SX-FI48GPP, SX-FI-24GPP, SX-FI-24HF, SX-FI-2XG, and SX-FI-8XG
modules
Packet received on
ingress port
Ye s
No
Does the
packet match an
ACL that defines
a priority?
Ye s
Ye s
Ye s
No
No
No
Ye s
No
Perform QoS
marking according
to ACL QoS
action
Does the
MAC address
match a static
entry and
priority >0?
Trust the priority
of the static
MAC entry
Does the port
ignore the VLAN
priority?
Trust the port’s
default priority
Is the port
configured
to trust DSCP,
and is the
incoming packet
an IP packet?
Trust the DSCP to
priority mapping
Trust the VLAN
priority 802.1p
Trust the port’s
default priority
Is the packet
tagged?