Dell FCX648-E Manual

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PowerConnect B-Series FCX Configuration Guide 593

53-1002266-01

Classification

17

FIGURE 112 Determining a packet trust level - PowerConnect B-Series FCX devices

Once a packet is classified, it is mapped to an internal forwarding queue. There are eight queues

designated 0 through 7. The internal forwarding priority maps to one of these eight queues as

shown in Table 94 through Table 97. The mapping between the internal priority and the forwarding

queue cannot be changed.

Table 94 through Table 97 show the default QoS mappings that are used if the trust level for CoS or

DSCP is enabled.

Packet received on

ingress port

Does the

port have a

default

priority?

Use the default

priority of 0

Tr ust the port’s

default priority

Tr ust the DSCP-

CoS-mapping or

the DSCP-marking

Ye s

Does the

MAC address

match a static

entry?

Tr ust the priority

of the static

MAC entry

Ye s

Ye s

No

No

No

No

Ye s

Tr ust the 802.1p

CoS value

Is the packet

tagged?

Does the

packet match an

ACL that defines

a priority?