VPWS Pseudo Wire Traffic Balancing via Dynamic State Switching
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Solution Overview
Problem
In VPWS PW redundancy technologies, the bandwidth resource of a secondary PW is underutilized since only one PW is actively forwarding data traffic at a time, leading to inefficient bandwidth utilization due to the standby state of the secondary PW.
Innovation Solution
A packet forwarding method is introduced where a primary PW and a secondary PW are negotiated to switch from an active and standby state to a balance state, respectively, allowing both to actively forward traffic, thereby implementing traffic balancing and improving bandwidth utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a primary PW and secondary PW are configured for redundancy protection, then service reliability is improved, but bandwidth utilization deteriorates because the secondary PW remains in standby state
Solution Approach 1:
The patent implements dynamic state transitions for PWs, allowing them to switch between active, standby, and balance states. The secondary PW dynamically transitions from standby to balance state, enabling it to actively forward traffic when conditions permit, thus improving bandwidth utilization while maintaining reliability through state-based control mechanisms
Solution Approach 2:
The patent changes the operational parameters of the secondary PW by introducing a 'balance state' that allows traffic forwarding. This parameter change enables the secondary PW to transition from a passive standby mode to an active forwarding mode, optimizing bandwidth utilization while preserving redundancy protection capabilities
2Device complexity
If only one PW is used to forward data traffic at any time, then redundancy protection function is simplified, but bandwidth resource utilization deteriorates
Solution Approach 1:
The patent introduces dynamic state management where PWs can transition between different operational states (active, standby, balance). This allows the system to simplify redundancy protection through clear state definitions while simultaneously improving bandwidth utilization by enabling the secondary PW to forward traffic in the balance state
Solution Approach 2:
The patent ensures continuous useful action by allowing the secondary PW to forward traffic continuously when in the balance state, rather than remaining idle in standby mode. This maintains the simplicity of redundancy protection while eliminating bandwidth waste through continuous utilization of available resources
Data Source
AI summary
A packet forwarding method, a device, and a system, where a first provider edge (PE) device separately sends request packets to a second PE device and a third PE device. The second PE device receives the two request packets separately using a primary pseudo wire (PW) and using a secondary PW, the third PE device, and a bypass PW, switches preferential forwarding statuses relative to the primary PW and the bypass PW to a balance state, and then, notifies the first PE device and the third PE device using a response packet. The first PE device switches preferential forwarding statuses relative to the primary PW and the secondary PW to the balance state based on the response packet. The third PE device switches a preferential forwarding status relative to the bypass PW to the balance state based on the response packet.