Boundary Apparatus BUM Transfer Prevention in L2 to EVPN Networks
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Solution Overview
Problem
In network systems, there is a challenge in transferring unicast traffic via a boundary apparatus geographically close to the user apparatus from an L2 network to an EVPN, while preventing overlapping distribution of BUM (broadcast, unknown unicast, multicast) frames, which often results in detoured traffic paths.
Innovation Solution
A communication system is implemented with multiple paths connecting networks, where a transfer prevention unit is selectively enabled or disabled for BUM frames, ensuring that these frames are only transferred through a specific path, utilizing a designated forwarder selection function to determine the appropriate boundary apparatus for transfer prevention and facilitation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If all-act setting is used for communication from L2 network to EVPN, then unicast communication can be performed, but overlapping distribution of BUM frames occurs via multiple boundary apparatuses
Solution Approach 1:
The patent applies local quality by enabling the transfer prevention unit selectively at specific boundary apparatuses rather than uniformly across all boundary apparatuses. The BUM passing/non-passing determination unit identifies which boundary apparatus should pass BUM frames based on local conditions (geographic proximity to user apparatus), allowing each boundary apparatus to have different transfer prevention settings tailored to its specific role in the network topology.
2Object-generated harmful factors
If single-act setting is used for communication from L2 network to EVPN, then overlapping distribution of BUM is prevented, but both unicast and BUM may be transferred via a boundary apparatus geographically separated from user apparatus
Solution Approach 1:
The patent implements dynamics by making the transfer prevention unit's enabling state variable rather than fixed. The BUM passing/non-passing determination unit dynamically determines whether to pass BUM frames based on real-time network conditions and geographic topology, allowing the system to adapt its behavior to minimize traffic path length while preventing overlapping distribution. This dynamic approach allows different boundary apparatuses to have different transfer prevention configurations optimized for their specific geographic locations.
3Object-generated harmful factors
If transfer prevention unit is enabled at all boundary apparatuses, then overlapping distribution of BUM is prevented, but unicast traffic must be detoured through geographically distant boundary apparatuses
Solution Approach 1:
The patent applies local quality by enabling the transfer prevention unit selectively at specific boundary apparatuses rather than uniformly across all boundary apparatuses. The BUM passing/non-passing determination unit identifies which boundary apparatus should pass BUM frames based on local conditions (geographic proximity to user apparatus), allowing each boundary apparatus to have different transfer prevention settings tailored to its specific role in the network topology.
Data Source
AI summary
An object of the present disclosure is to transfer unicast via a boundary apparatus that is geographically close to a user apparatus even in communication from an L2 network to an EVPN and to prevent overlapping distribution of BUM. According to the present disclosure, there is provided a communication system in which a first network and a second network are connected to each other by a plurality of paths, in which, in the plurality of paths, a transfer prevention unit that prevents transfer of a broadcast frame, an unknown unicast frame, and a multicast frame from the second network to the first network is included, and in which a broadcast frame, an unknown unicast frame, and a multicast frame are transferred from the second network to the first network by only a specific path of the plurality of paths.