January 2001
Intermediate to advanced
368 pages
11h 35m
English
Content preview from IP Quality of Service
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218 Chapter 9: QoS in MPLS-Based Networks
• S bit—Indicates a label entry at the bottom of the label stack. It is set to 1 for the last
entry in the label stack and to zero for all other label stack entries. This allows binding
a prefix with multiple labels, also called a label stack. In the case of a label stack, each
label has its own associated CoS, S, and TTL values.
• TTL (8 bits)—Indicates the time to live for an MPLS packet. The TTL value, when
set at the edge of the MPLS network, is decremented at each MPLS network hop.
NOTE The IP TTL field is copied into the MPLS TTL field during label imposition by default. It
enables the traceroute utility ...
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