Edge Node Yellow Traffic Regulation in Metro Ethernet
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Solution Overview
Problem
In large metro Ethernet networks, the Two Rate Three Color Marking (TRTCM) technique leads to network traffic congestion due to significant volumes of yellow traffic being injected into the core, causing yellow and green frames to compete for resources, resulting in scheduling delays and queue overflows.
Innovation Solution
A method and system that quantify the extent of transmission rate violation relative to a committed bandwidth profile, allowing for the regulation of yellow traffic by selecting an appropriate peak information rate and assigning tokens for data traffic, which determines the order of precedence and drop probability for frames, thereby managing the volume of yellow traffic at edge nodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If TRTCM technique is used to regulate network traffic, then traffic can be classified into green, yellow and red categories, but significant volume of yellow traffic is injected into the core network causing congestion
Solution Approach 1:
The patent applies preliminary action by regulating yellow traffic at the edge node before it enters the core network. The system identifies yellow traffic early in the network path and applies regulation measures (discarding, marking, or rate limiting) at the edge node, preventing the traffic from causing congestion in the core network while still maintaining the benefits of TRTCM classification.
2Productivity
If yellow frames are forwarded with high drop probability, then some yellow traffic can pass through, but scheduling delays occur and data frames pile up in queues exceeding CIR
Solution Approach 1:
The system performs preliminary regulation of yellow traffic at the edge node before it enters the core network. By applying regulation measures early, the system prevents yellow traffic from accumulating in core network queues and causing scheduling delays, while still allowing some yellow traffic to pass through with controlled drop probability.
3Adaptability or versatility
If yellow and green frames from edge node compete for common queue resources, then both types of frames can be transmitted, but network traffic congestion occurs in the core network
Solution Approach 1:
The patent applies segmentation by separating the treatment of yellow and green frames at the edge node. Instead of allowing both types of frames to compete for the same queue resources in the core network, the system regulates yellow frames separately before they enter the core, giving green frames priority access to queue resources while still allowing controlled yellow frame transmission.
Data Source
AI summary
A method, an apparatus and/or a system to regulate yellow traffic in a network is provided. In one embodiment, the method includes quantifying, an extent of violation of a transmission rate of a data traffic relative to a committed bandwidth profile in a network. The data traffic is generated through a client device coupled to the network. The method also includes regulating, a volume of the data traffic associated with a particular level of compliance relative to the committed bandwidth profile, at an edge node of the network, based on the quantification. The committed bandwidth profile specifies an average rate of committed and excess data traffic generated by the client device. The particular level of compliance is characterized by the transmission rate exceeding a committed information rate and lying within a peak information rate. The peak information rate is maximum allowable rate of admission of frames into the network.