Figure 51: TTL Processing on Incoming MPLS Packets
TTL Processing on Outgoing MPLS Packets
The flow chart on Figure 52 on page 217 illustrates TTL processing on outgoing MPLS
packets.
Rules for Processing on an LSR
On an LSR—where an MPLS packet is label-switched after processing on the line
module—the TTL value in the swapped-to label is decremented by 1 from the
incoming TTL value when the swapped-to label is not implicit-null. When the
swapped-to label is implicit-null (for example, in a PHP configuration), the inner or
MPLS Label Switching and Packet Forwarding â– 215
Chapter 2: MPLS Overview
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