Ethernet Switch PFGs for Constrained Forwarding
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Solution Overview
Problem
Conventional Ethernet systems face inefficiencies in constrained forwarding between endpoints, particularly in E-Tree services, due to shared VLAN learning, complex port configurations, and bandwidth wastage, especially when handling broadcast/multicast traffic and IEEE 802.1Q-2011 Connectivity Fault Management frames.
Innovation Solution
The implementation of Ethernet switches with virtual switches utilizing Private Forwarding Groups (PFGs) and asymmetric VLANs, along with Access Control Lists, to manage packet forwarding between Root and Leaf User-Network Interfaces, ensuring secure and efficient traffic separation while interoperating with IEEE 802.1Q-2011 approaches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If shared VLAN learning is used in conventional Ethernet systems, then VLAN traffic can be learned and forwarded, but unknown unicast traffic is flooded to all UNIs causing security issues and bandwidth wastage
Solution Approach 1:
The invention segments the VLAN forwarding domain into multiple Private Forwarding Groups (PFGs), where each PFG is an isolated forwarding instance. This segmentation prevents unknown unicast traffic from being flooded across all UNIs by confining it to specific PFG boundaries, thereby eliminating the security and bandwidth issues while maintaining reliable traffic forwarding within each group.
Solution Approach 2:
The invention introduces PFG identifiers as an intermediary mechanism between VLAN learning and forwarding decisions. By inserting this intermediate layer, the system can control and restrict unknown unicast flooding behavior without compromising the underlying VLAN learning functionality, thus resolving the contradiction between reliable forwarding and harmful flooding.
2Ease of operation
If asymmetric VLAN configurations with VLAN member sets are used, then constrained forwarding can be achieved, but device complexity and configuration requirements increase
Solution Approach 1:
The invention creates a universal PFG-based forwarding mechanism that can handle multiple constrained forwarding scenarios (E-Tree, E-VPN, VPLS) through a single unified approach. Instead of requiring separate asymmetric VLAN configurations for each service type, the PFG mechanism provides multi-functional constrained forwarding, reducing device complexity and configuration requirements while maintaining ease of operation.
3Reliability
If all broadcast/multicast traffic is forwarded through the network, then complete traffic delivery is ensured, but network bandwidth is wasted on leaf-to-leaf traffic that is ultimately dropped
Solution Approach 1:
The invention applies local quality by assigning different forwarding characteristics to different PFGs based on their specific requirements. Root PFGs can forward broadcast/multicast traffic to all members, while Leaf PFGs are configured to drop such traffic locally. This localized quality control ensures complete traffic delivery where needed while preventing bandwidth wastage where not needed, resolving the contradiction between delivery completeness and energy efficiency.
Data Source
AI summary
An Ethernet Tree (E-Tree) service is described instantiated on an Ethernet switch and in an Ethernet network. The E-Tree service is implemented using Private Forwarding Groups (PFGs), asymmetric Virtual Local Area Networks (VLANs), virtual switches, and port configurations. The use of PFGs in addition to asymmetric VLANs provides higher levels of security in the described E-Tree systems and methods. The E-Tree systems and methods also can utilize Access Control Lists (ACLs) at Network-Network Interfaces (NNIs) for controlling unknown unicasts from reaching wrong ports. The E-Tree systems and methods can also seamlessly interoperate with packet switches using an IEEE 802.1Q-2011 approach.