300-320 · Question #683
From a service provider point of view, which of the following offers higher bandwidth and a more scalable Layer 2 WAN solution?
The correct answer is C. H-VPLS. H-VPLS (Hierarchical VPLS) is an evolution of standard VPLS designed specifically to improve service provider scalability. In a flat VPLS design, every PE router must maintain a full mesh of pseudowires to every other PE, which does not scale well. H-VPLS introduces a two-tier…
Question
From a service provider point of view, which of the following offers higher bandwidth and a more scalable Layer 2 WAN solution?
Options
- AVPWS
- BVPLS
- CH-VPLS
- DL2TPv3
How the community answered
(30 responses)- A13% (4)
- B7% (2)
- C77% (23)
- D3% (1)
Explanation
H-VPLS (Hierarchical VPLS) is an evolution of standard VPLS designed specifically to improve service provider scalability. In a flat VPLS design, every PE router must maintain a full mesh of pseudowires to every other PE, which does not scale well. H-VPLS introduces a two-tier hierarchy: access (or U-PE) nodes connect to core (or N-PE) nodes via a simpler spoke pseudowire, while full-mesh pseudowires exist only among N-PE devices. This dramatically reduces the number of signaling sessions and MAC table entries each PE must maintain, enabling service providers to support far more customer sites without sacrificing forwarding performance or bandwidth.
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