Anchor Leaf Switch Loop Prevention in VXLAN Migration
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Solution Overview
Problem
The challenge lies in preventing potential loops during the migration of legacy Ethernet-based layer 2 networks to VXLAN overlay networks, as existing technologies like STP are not effective across VXLAN overlays, and there is a need for seamless coexistence and migration schemes that avoid loop formation between VLAN and VXLAN segments.
Innovation Solution
The solution involves anchor leaf switches detecting reachability over both VXLAN and physical layer 2 networks, with mechanisms like MP-BGP EVPN address-family and network access control lists (ACLs) to block VLANs or VNIs on ports connecting to spine routers, ensuring no loops form during the migration phase, and utilizing existing HSRP mechanisms for redundancy and failure protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If STP (Spanning Tree Protocol) is used to prevent loops in legacy Ethernet networks, then loop prevention is effective in traditional layer 2 networks, but it becomes ineffective across VXLAN overlay networks during migration
Solution Approach 1:
The patent introduces a loop prevention mechanism that operates at the boundary between legacy Ethernet and VXLAN overlay networks. Anchor leaf switches act as intermediaries that detect loops in the legacy Ethernet domain and prevent them from propagating into the VXLAN overlay domain, thereby maintaining loop prevention effectiveness across heterogeneous network types where STP alone is insufficient
Solution Approach 2:
The patent segments the network into distinct domains (legacy Ethernet and VXLAN overlay) with anchor leaf switches serving as boundary devices. This segmentation allows different loop prevention mechanisms to operate independently in each domain while coordinating at the boundaries, resolving the incompatibility of STP across overlay networks
2Duration of action of stationary object
If VLANs and VXLAN segments coexist during migration, then network continuity is maintained, but potential loops may form between the two network types
Solution Approach 1:
The patent implements preliminary loop detection and prevention mechanisms before loops can form during migration. Anchor leaf switches proactively monitor for potential loop conditions between VLAN and VXLAN segments and take preventive actions (such as blocking specific ports or adjusting forwarding behavior) to eliminate loop risks while maintaining network continuity
Solution Approach 2:
The patent employs feedback mechanisms where anchor leaf switches continuously monitor network topology and traffic patterns to detect potential loops. When loops are detected or predicted, the system provides feedback to adjust forwarding decisions dynamically, allowing VLAN and VXLAN segments to coexist safely during migration
Data Source
AI summary
Coexistence and migration of legacy and VXLAN networks may be provided. A first anchor leaf switch and a second anchor leaf switch may detect that they can reach each other over a Virtual Extensible Local Area Network (VXLAN) overlay layer 2 network. In response to detecting that they can reach each other over the VXLAN, the second anchor leaf switch may block VLANs mapped to the VXLAN's VXLAN Network Identifier (VNI) on the second anchor leaf switch's ports connecting to spine routers. In addition, the first anchor leaf switch and the second anchor leaf switch may detect that they can reach each other over a physical layer 2 network. In response to detecting that they can reach each other over a physical layer 2 network, the second anchor leaf switch may block Virtual Extensible Local Area Network (VXLAN) segments at the second anchor leaf switch.