FIB Tunnel ID Zero Meaning in Huawei VRP
Short answer
B A tunnel ID of 0 in the FIB indicates standard IP forwarding without tunnel encapsulation, making the statement false.
Question
Key Takeaways
The main trap is assuming any tunnel ID implies tunnel usage; however, 0 specifically means no tunnel.
This question tests understanding of Huawei VRP FIB entries where a tunnel ID of 0 signifies standard IP forwarding rather than tunnel encapsulation. The correct answer is False.
Common mistake: Choosing True by incorrectly associating any 'tunnel' field with active tunneling, ignoring that zero is a null/non-tunnel indicator.
Expert Analysis
FIB Tunnel ID Semantics
In Huawei VRP and similar networking operating systems, the Forwarding Information Base (FIB) uses a tunnel identifier to determine how to handle matched packets. The critical distinction lies in the value of this ID.
Tunnel ID = 0 A tunnel ID of 0 indicates that no tunnel encapsulation is required. The packet is forwarded using standard IP routing (hop-by-hop). It does not enter an MPLS, GRE, or other tunnel; it simply follows the next-hop IP address.
Tunnel ID ≠ 0 A non-zero tunnel ID (e.g., 1, 2, etc.) signals that the packet must be encapsulated into a specific tunnel (such as an MPLS LSP, GRE, or IPSec) before forwarding.
Trap Analysis The question states that a tunnel ID of 0 means the packet needs to be forwarded through a tunnel. This is incorrect because 0 explicitly denotes the absence of a tunnel. The comment correctly clarifies that "Tunnel ID = 0x0... indica que el paquete se reenvía en modo hop-by-hop convencional... no requiere túnel" (indicates conventional hop-by-hop forwarding... no tunnel required).
Therefore, the statement is false.
Exam Strategy
Memorize the binary logic of tunnel IDs in FIB lookups: 0 equals plain IP routing, while any positive integer equals tunnel encapsulation. When reviewing forwarding tables, always check if the ID is zero to avoid misinterpreting normal routes as tunneled traffic.
Frequently Asked Questions
What does a tunnel ID of 0 mean in Huawei VRP?
When is a tunnel ID non-zero used?
Community Votes
100% of anonymous learners picked answer B. Votes are pick records left by other test-takers — they are not the verified answer.
Discussion 1 contributions
Compiled from public community threads and reader submissions, lightly edited for clarity. Handles and vote tallies are shown as recorded, and comments reflect the views of individual contributors.
From public community threads 1
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HCIP Resolutor 👍 1 Answered BEn la arquitectura de reenvío de datos (FIB) del sistema operativo Huawei VRP: Un Tunnel ID = 0x0 (ó 0) indica que el paquete se reenvía en modo hop-by-hop convencional por enrutamiento IP común (no requiere túnel). Un Tunnel ID (diferente de cero, ej. 0x1, 0x2, etc.) indica que el paquete debe ser encapsulado y reenviado a través de un túnel (como MPLS LSP, GRE, L2TP, IPSec, etc.).
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