Which of the following statements are true about wireless traffic forwarding modes on a fabric wireless network?
A.
Direct forwarding is not suitable for scenarios that have high requirements for roaming performance. This is because roaming performance deteriorates slightly when a STA roams across edge nodes.
B.
Direct forwarding is more efficient.
C.
Tunnel forwarding facilitates centralized management and control of wireless traffic.
D.
Tunnel forwarding has the disadvantage of traffic detour, which increases the forwarding-performance pressure on the WAC.
All four statements correctly describe the trade-offs between direct and tunnel forwarding. With direct forwarding, an AP sends service traffic directly to the upstream network rather than encapsulating it in a CAPWAP data tunnel to the WAC. This eliminates unnecessary detours, avoids creating a WAC bandwidth bottleneck, reduces WAC load, and generally provides higher forwarding efficiency.
However, on a fabric network, Layer 3 roaming across different edge nodes may require the original edge or another designated device to remain the home agent. The resulting forwarding path and state synchronization can slightly affect roaming performance, making direct forwarding less suitable for extremely roaming-sensitive deployments. Huawei’s material explains that after Layer 3 roaming in direct-forwarding mode, traffic may continue to be forwarded through the home agent.
Tunnel forwarding sends AP service traffic through CAPWAP tunnels to the WAC. This simplifies centralized policy enforcement, security control, and traffic management. Its disadvantage is that all wireless traffic may detour through the WAC, increasing forwarding pressure and potentially creating a performance bottleneck.
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