Software Assistance:

• Interrupt and Polling Configuration: Disabled Packet Transmission Complete Interrupt and Packet Reception Interrupt to reduce interrupt overhead. Implemented periodic polling for packet reception to ensure timely processing.
• Timer Synchronization: Synchronized timer clock source with 802.1AS to reduce drift in timer periodic interrupts.
• Pulse Generation Configuration: Configured pulse generation to start before the 802.1Qbv gate opens to ensure accurate and timely pulse generation.

• Inter-VLAN routing: Routes VLAN Tag1 packet to VLAN Tag2 to duplicate packets in both directions.
• VLAN routing configuration: Configured on both MAC ports to egress packets with updated VLAN tags.
• 802.1Q Packet Duplication: Uses Inter-VLAN routing feature to duplicate packets and send them in both clockwise and anti-clockwise directions in the Ring Network.
• Address Lookup Engine(ALE): Determines Inter-VLAN egress opcode for each packet to be VLAN routed.
• Classifier/Policer configuration: Configured for the route to modify VLAN tags and duplicate Ethernet packet on both MAC ports.

• Adds custom header using Zero-copy which helps to reject the duplicate packets on receiver zonal controller
• Generating Ethernet packet with non continuous buffers for Header addition.

• Removes Custom Header on the receiver end after detecting and deleting duplicate packets coming from other direction, ensuring clean and original packet delivery
• Generating Ethernet packet with non continuous buffers for Header addition.

• Packet Detection Flow: SequenceID-based duplicate detection using per-node state tracking. Each node maintains last accepted sequence number and 64-bit history bitmap.
• Per-node State: Tracks recSeqNum (last accepted sequence), seqHistory (64-bit bitmap), and initialization flag for each data stream identified by MAC address.
• Five Detection Cases:
  1. In-Order/Future Packet (seqDiff > 0) - Accept and shift window forward
  2. Out-of-Order Within Window (seqDiff < 0) - Check bitmap for prior receipt
  3. Too Old/Beyond Window - Reject as stale duplicate
  4. Exact Duplicate (seqDiff = 0) - Reject immediate duplicate
  5. Large Forward Gap - Reject as potential desynchronization
• Wraparound Handling: 8-bit sequence numbers wrap at 256 with signed arithmetic boundary adjustment.
• Statistics Tracking: Maintains counts for original packets, duplicates rejected, and out-of-order packets accepted.