Multi-Stream Analysis
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6.2.4. IPv4 Selection
The test unit filtering capabilities can be programmed to match fields within the IPv4
datagram. It is currently supported IP datagram matching based on source IP address,
Top label match Enables selection based on the top MPLS label in the current
filter. Top label matching makes sense only if the received
packets carry two MPLS labels. In this case the top label is
the one placed closer to the layer two header.
The available configuration values for this field are the same
that for the Bottom label match setting.
Top label Top of the stack MPLS label. It is 20-bit MPLS label in deci-
mal format. Labels are used for switching packets in MPLS
networks. Labels have local meaning only. That means that a
single LSP could have different MPLS labels in different links
between different routers
Top traffic class
match
Enables selection based on the class of service bits included
in the top MPLS label in the current filter. The available con-
figuration values for this field are the same that for the Top
label match setting.
Top traffic class Top 3-bit MPLS CoS identifier. It was first thought that this
field could carry the 3 IPv4 Type-of-Service (ToS) bits, but
currently, the ToS field is being replaced by 6-bit Differenti-
ated Services Code Points (DSCP). This means that only a
partial mapping of all the possible DSCPs into this field is
possible.
Table 6.3: MPLS Selection
Field Description
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