Foundry Configuration Guide for the FESX, FSX, and FWSX
13 - 4 © Foundry Networks, Inc. December 22, 2005
As shown in the figure, the first criteria considered is whether the packet matches on an ACL that defines a priority.
If this is not the case and the packet is tagged, the packet is classified with the 802.1p CoS value. If neither of
these are true, the packet is next classified based on the static MAC address, ingress port default priority, or the
default priority of zero (0).
Once a packet is classified by one of the procedures mentioned, it is mapped to an internal forwarding queue.
There are eight queues designated as 0 to 7. The internal forwarding priority maps to one of these eight queues
as shown in Table 13.2 through Table 13.5. The mapping between the internal priority and the forwarding queue
cannot be changed.
Table 13.2 through Table 13.5 show the default QoS mappings which are used if the trust level for CoS or DSCP is
enabled.
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