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Chapter 5
Packet Classification and Labelling
E-NIT-CTC-20041213-0013 v0.5
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5.1.1 Order of classification rules
Introduction The SpeedTouch™ will first check the routing rules and assign a routing-label when a
rule is hit. Secondly the packet will go through the QoS rules and a qos-label will be
assigned if a rule is hit. So each packet can get two labels assigned.
The figure below shows an example of the hierarchical order of classification rules:
Sub-chains In case sub-chains are linked within a chain, these sub-chains have an index and the
sub-chain rules are matched before the rules with the following index in the parent
chain.
!
The order of the classification rules (determined by the rule index) is very
important. The first rule that applies to a packet determines which label will
be assigned to that packet. When a rule applies to a packet in the routing
classification, the rule matching process stops and the QoS classification
starts untill the first rule is hit and a label is assigned.
qos_user_labels
qos_default_labels
qos_user_rule_2
qos_user_rule_n
qos_default_rule_1
qos_default_rule_2
qos_default_rule_n
qos_user_rule_1
0
1
0
0
1
1
2
2
qos_user_chain_1
3
chain_rule
_1
chain_rule
_2
rt_user_labels
rt_default_labels
0
1
rt_user_rule_1
rt_user_rule_2
rt_default_rule_1
rt_default_rule_2
0
0
1
1
Routing classification
QoS classification
Routing parameters only apply to routing labels; QoS parameters only apply
to QoS labels