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User Guide
130
The filtering capabilities of the test unit can be used to match MPLS header field of IP
packets carrying up to two different labels.
Table 6.3: MPLS Selection
Field Description
Bottom label match Enables selection based on the bottom MPLS label in the
current filter. The value configured here is used to determine
which frames are allowed to pass through the filter and which
ones are blocked. The available configuration values for this
field are:
• Ignore: The bottom MPLS label is ignored and not taken
into account for the purpose of the filter. No frame is
selected by the filter when Ignore has been configured.
• Equal to: All frames matching a user configurable MPLS
label are allowed to pass through the filter. This label is
configured with the help of the Bottom label field.
Bottom label Bottom of the stack MPLS label. It is 20-bit MPLS label in
decimal 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
Bottom traffic class
match
Enables selection based on the class of service bits included
in the top MPLS label in the current filter. The value config-
ured here is used to determine which frames are allowed to
pass through the filter and which ones are blocked. The
available configuration values for this field are:
• Ignore: The bottom class of service field is ignored and not
taken into account for the purpose of the filter. No frame is
selected by the filter when Ignore has been configured.
• Equal to: All frames matching a user configurable class of
service field are allowed to pass through the filter. The
class of service field is configured with the help of the Bot-
tom traffic class field.
Bottom traffic class Bottom 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.
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