Multiprotocol Label Switching - MPLS IP Forwarding: Data Plane - The MPLS TTL Field and MPLS TTL Propagation
9 important questions on Multiprotocol Label Switching - MPLS IP Forwarding: Data Plane - The MPLS TTL Field and MPLS TTL Propagation
What are the two important feature of the (MPLS) TTL Field?
-Used for traceroute
What does the Ingress E-LSR do with the TTL field when it recieves an IP packet? 3
-pushes a label into unlabeled packet
-copies the packet IP TTL field into the new MPLS header's TTL field
What is the behavior of the traceroute command with MPLS?
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What are the reason to disable MPLS TTL propagation?
-Customers find IP address of LSR (confusing for customer)
What is the behavior when MPLS TTL propagation is disabeld? 2
-Egress E-LSR leaves Original header's TTL field unchanged
How does the MPLS network appear for the customer when MPLS TTL propagation is disabeld?
What are the abilities to disable MPLS TTL propagation?
-TTL propagation for packets created by SP's router (locally originated traffic)
What is the command to disable MPLS TTL propagation and where should it be configured?
All routers in the MPLS domain should TTL disable for consistent output of the TTL propagation
What is the command for mpls ping? Why would you like to use it?
"Normal" does not give all the information to check if there's a problem
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