QoS Policies
Quality of Service Guide 51
The enqueuing priority is specified as part of the classification rule and is set to “high” or
“low”. The enqueuing priority relates to the forwarding class queue’s High-Priority-Only
allocation where only packets with a high enqueuing priority are accepted into the queue once
the queue’s depth reaches the defined threshold. (See High Priority Only Buffers.)
The mapping of IEEE 802.1p bits, IP Precedence and DSCP values to forwarding classes is
optional as is specifying IP and MAC criteria.
The IP and MAC match criteria can be very basic or quite detailed. IP and MAC match
criteria are constructed from policy entries. An entry is identified by a unique, numerical
entry ID. A single entry cannot contain more than one match value for each match criteria.
Each match entry has a queuing action which specifies: the forwarding class of packets that
match the entry.
• The forwarding class of packets that match the entry
• The enqueuing priority (high or low) for matching packets
The entries are evaluated in numerical order based on the entry ID from the lowest to highest
ID value. The first entry that matches all match criteria has its action performed.
The supported service ingress QoS policy IP match criteria are:
• Destination IP address/prefix
• Destination port/range
• IP fragment
• Protocol type (TCP, UDP, etc.)
• Source port/range
• Source IP address/prefix
• DSCP value
The supported service ingress QoS policy MAC match criteria are:
• IEEE 802.2 LLC SSAP value/mask
3 MAC criteria:
• Multiple entries per
policy
• Multiple criteria per
entry
Set when an fc-name exists in the
entry’s action. Otherwise, preserve
from the previous match.
When MAC criteria is specified,
entries are matched based on
ascending order until first match
and then processing stops. A
packet can only match a single
MAC criteria entry.
Table 9: Forwarding Class Classification Based on Rule Type (Continued)
# Rule Forwarding Class Comments
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