EVPN Gateway Traffic Bypass Prevention
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Solution Overview
Problem
In EVPN communication across access rings, traffic detour occurs due to incomplete IP route advertisement, leading to reduced transmission efficiency and increased network resource consumption.
Innovation Solution
The method involves advertising detailed EVPN MAC/IP advertisement routes with more mask bits across gateways, enabling accurate layer-2 and layer-3 encapsulation and forwarding, thereby preventing traffic detour by ensuring precise routing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If only IP network segment route is advertised by gateway in EVPN, then network simplicity is maintained, but traffic detour occurs and transmission efficiency is reduced
Solution Approach 1:
The patent segments the routing information into two types: IP network segment routes (advertised by gateways) and detailed MAC/IP advertisement routes (advertised by access devices). This segmentation allows each type of device to advertise appropriate level of routing information, preventing traffic detour while maintaining network simplicity. Access devices advertise detailed MAC/IP routes with host-specific mask bits, while gateways continue to advertise only network segment routes.
Solution Approach 2:
The patent adds a new dimension to route advertisement by introducing MAC/IP advertisement routes that include both MAC address and IP address information with specific mask bits. This additional dimension allows receivers to perform more precise route matching, enabling direct routing decisions without traffic detour while maintaining compatibility with existing gateway-based network segment route advertisement.
2Loss of time
If detailed MAC/IP advertisement routes with more mask bits are advertised, then traffic detour is prevented and transmission efficiency is enhanced, but route advertisement and processing complexity increases
Solution Approach 1:
The patent applies local quality by allowing different devices to advertise routes with different levels of detail appropriate to their function. Access devices advertise detailed MAC/IP routes with host-specific mask bits for precise local routing, while gateways advertise only network segment routes. This localized differentiation enables precise routing decisions at access devices without requiring all devices to process complex detailed routes.
Solution Approach 2:
The patent changes the parameter of route specificity by introducing mask bits that indicate the level of routing detail. MAC/IP advertisement routes include mask bits that specify whether the route is for a network segment or a specific host, allowing receivers to perform efficient route matching based on the mask bit value. This parameter change enables precise routing without requiring complex processing at all devices.
3Productivity
If gateways advertise only network segment routes without host-specific routing information, then gateway function simplicity is maintained, but cross-access-ring communication efficiency is reduced
Solution Approach 1:
The patent segments the routing advertisement function between gateways and access devices. Gateways continue to perform simple network segment route advertisement, while access devices perform detailed MAC/IP route advertisement. This segmentation allows gateways to maintain configuration simplicity while cross-access-ring communication efficiency is improved through the detailed routes advertised by access devices.
Solution Approach 2:
The patent introduces MAC/IP advertisement routes as an intermediary mechanism that bridges the gap between simple gateway network segment routes and precise host-specific routing. These intermediate MAC/IP routes with mask bits provide the necessary detail for efficient cross-access-ring communication while allowing gateways to maintain their simple advertisement function.
Data Source
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AI summary
Provided in the present disclosure are a method and apparatus for preventing traffic bypassing. The method for preventing traffic bypassing is applied to a gateway of an EVPN and comprises: notifying other gateways of an EVPN MAC/IP notification routing of a first access device within a first access ring in which a current gateway is located, layer two forwarding information and layer three forwarding information of the first access device being carried in the routing; receiving an EVPN MAC/IP notification routing of a second access device within a second access ring that is notified by a second gateway within the second access ring, and according to layer two forwarding information and layer three forwarding information of the second access device that is carried in the routing, generating a detailed routing of the second access device; and when forwarding a message to the second access device, performing layer two encapsulation and layer three encapsulation on the message according to the detailed routing of the second access device, and forwarding the encapsulated message to the second gateway. The technical solution of the present disclosure may prevent traffic bypassing when accessing ring communication across an Ethernet virtual private network, and improve transmission efficiency.