VLAN Translation Network Device Packet Mirroring
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Solution Overview
Problem
In network devices, the insertion of a service provider identifier into packets for classification and service provision can modify the packets, leading to issues when a copy of the original packet is needed at a destination port, disrupting the unmodified packet flow and causing problems in mirroring processes.
Innovation Solution
The network device employs a centralized ingress and egress pipeline architecture with a Memory Management Unit (MMU) and egress module that processes packets without modifying them until necessary, allowing for dynamic selection of physical ports and VLAN translation, enabling unmodified packets to be transmitted to destination ports while supporting high-speed traffic and mirroring without disrupting the original packet flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a service provider identifier is inserted into each packet for classification and service provision, then packet classification and service management are improved, but the original packet is modified, causing problems when an unmodified copy is needed at destination ports
Solution Approach 1:
The system segments packet handling into multiple paths: one path inserts service provider identifiers for classified service provision, while another path preserves original packets for mirroring and monitoring. This segmentation allows simultaneous packet modification for services and preservation of original packets for integrity requirements.
Solution Approach 2:
The system creates copies of packets at strategic points in the network device. When a packet needs to be mirrored to a destination port, the system provides an unmodified copy of the original packet rather than the modified version, ensuring packet integrity for monitoring and analysis purposes while still enabling service provider identifier insertion for service delivery.
2Adaptability or versatility
If packets are modified by inserting service provider identifiers, then service provision to multiple customers is enabled, but mirroring processes are disrupted because the mirrored packet is no longer the original
Solution Approach 1:
The system introduces an intermediary mechanism that intercepts packets before they reach destination ports and provides unmodified copies specifically for mirroring operations. This intermediary ensures that while service provider identifiers are inserted for service provision, the mirroring process receives and transmits the original unmodified packet, maintaining mirroring accuracy.
3Ease of operation
If the service provider identifier is inserted into packets at the receiving port, then packet routing and service management are simplified, but the original packet flow is disrupted and network bottlenecks may occur
Solution Approach 1:
The system performs preliminary actions by pre-configuring service provider identifier mappings and mirroring rules before packets arrive. This allows packets to be processed efficiently without requiring complex real-time decisions, maintaining both routing simplicity and high network throughput by avoiding bottlenecks at receiving ports.
Data Source
AI summary
A network device for implementing VLAN translation on a packet. The network device includes a user network interface port for receiving and transmitting packets to customers of a network. The network device also includes a network to network interface port for communicating with a second network device in the network. A packet received at the user network interface port is classified, translated based on a predefined provider field associated with the packet, and encapsulated with a tag that is removed when the packet is transmitted from the user network interface port to a customer.