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User Guide
84
5. Select one of the traffic flows between Flow #1 and Flow #8 to enter in the flow
specific configuration.
Table 4.4: MPLS Settings
Setting Description
Stack configuration Configures the size of the MPLS label stack for the current
flow. Both single and double stack configurations are sup-
ported.
• Off: Disables MPLS generation in the current flow.
• Single MPLS label: Enables single MPLS label genera-
tion in the current flow. The user is expected to configure
the bottom label, traffic class and TTL for the MPLS
header.
• Double MPLS label: Enables double MPLS label genera-
tion in the current flow. The user is expected to configure
both the top and bottom label, traffic class and TTL for
the MPLS headers.
Bottom label MPLS label used for switching traffic in the bottom MPLS
header.
This field is enabled when the user has selected Single
MPLS label or Double MPLS label in Stack configuration.
Bottom traffic class Contains the traffic class identifier for the bottom MPLS
header. It was first thought that this field could carry the 3
Type-of-Service (ToS) bits defined for Class of Service (CoS)
definition in the IP version 4, but currently, the ToS field is
being replaced by 6-bit Differentiated Services Code Points
(DSCP). This means that only a partial mapping of all the
possible DSCPs into this field is possible.
This field is enabled when the user has selected Single
MPLS label or Double MPLS label in Stack configuration.
Bottom TTL This field contains a Time To Live value for the bottom MPLS
header. The value of this field is decremented by one unit
every time the packet traverses an LSR. The packet is dis-
carded if the value reaches 0.
This field is enabled when the user has selected Single
MPLS label or Double MPLS label in Stack configuration.
Top label This field contains the MPLS label used for switching traffic in
the top MPLS header.
This field is enabled only if the user has selected Double
MPLS label in Stack configuration.
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