Avoiding MPLS Packet Loss: Best Implementation Feature | CCIE Security Exam

Avoiding MPLS Packet Loss

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Which feature can be implemented to avoid any MPLS packet loss?



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A. B. C. D. E.


MPLS (Multiprotocol Label Switching) is a technique used to enhance the forwarding speed of network packets. In an MPLS network, packets are forwarded based on their label, rather than their IP address, which allows for faster packet forwarding and better traffic engineering.

To avoid MPLS packet loss, it is important to implement features that ensure the correct forwarding of packets. Out of the options given, the feature that can be implemented to avoid any MPLS packet loss is B. LDP IGP sync.

LDP (Label Distribution Protocol) is a protocol used to distribute labels across an MPLS network. IGP (Interior Gateway Protocol) is a routing protocol used to exchange routing information within an autonomous system. LDP IGP sync is a feature that synchronizes the MPLS label distribution with the IGP routing table.

When LDP IGP sync is enabled, the label bindings are only advertised for prefixes that are in the IGP routing table. This ensures that only the correct labels are assigned to packets, which reduces the likelihood of packet loss due to incorrect label assignment.

Option A, IP TTL propagation, is a mechanism that allows for the propagation of the TTL (Time-to-Live) field of IP packets across an MPLS network. This feature is used to prevent loops and ensure proper packet forwarding but does not directly address MPLS packet loss.

Option C, label advertisement sync, is not a valid feature.

Option D, conditional label advertisement, is a feature that allows for the conditional distribution of labels based on certain criteria, such as the availability of resources. While this feature can help optimize label distribution, it does not directly address MPLS packet loss.

Option E, PHP (Penultimate Hop Popping), is a feature that removes the penultimate label from a packet before forwarding it to the next hop. This feature can help reduce the amount of label stack depth, which can improve forwarding efficiency. However, it does not directly address MPLS packet loss.