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Table	Description
TC_TO_QUEUE_MAP	In the egress direction, maps the traffic class to an egress queue.
DSCP_TO_TC_MAP	In the ingress direction, maps the DSCP field in an IP packet into a traffic class. By utilizing this table and the TC_TO_QUEUE_MAP table, a packet can be mapped from its DSCP field to the egress queue. In case there is a congestion in the egress queue, the back-pressure mechanism is triggered, and the PFC frame can be sent. The priority in the PFC frame is determined by TC to priority group mapping table.
MAP_PFC_PRIORITY_TO_QUEUE	Maps the priority in the received PFC frames to an egress queue so that the switch knows which egress to resume or pause.
PFC_PRIORITY_TO_PRIORITY_GROUP_MAP	Maps PFC priority to a priority group.
TC_TO_PRIORITY_GROUP_MAP	Maps the PFC priority to a priority group and enables the switch to set the PFC priority in xon/xoff frames in order to resume/pause corresponding egress queue at the link peer.
PORT_QOS_MAP	Defines the mappings adopted by a port, including: – tc_to_queue_map, default value is TC_TO_QUEUE_MAP/AZURE – dscp_to_tc_map, default value is DSCP_TO_TC_MAP/AZURE – pfc_to_queue_map, default value is MAP_PFC_PRIORITY_TO_QUEUE/AZURE – pfc_to_pg_map, default value is PFC_PRIORITY_TO_PRIORITY_GROUP_MAP/AZURE – tc_to_pg_map, default value is TC_TO_PRIORITY_GROUP_MAP

Table

Description

TC_TO_QUEUE_MAP

In the egress direction, maps the traffic class to an egress queue.

DSCP_TO_TC_MAP

In the ingress direction, maps the DSCP field in an IP packet into a traffic class. By utilizing this table and the TC_TO_QUEUE_MAP table, a packet can be mapped from its DSCP field to the egress queue. In case there is a congestion in the egress queue, the back-pressure mechanism is triggered, and the PFC frame can be sent. The priority in the PFC frame is determined by TC to priority group mapping table.

MAP_PFC_PRIORITY_TO_QUEUE

Maps the priority in the received PFC frames to an egress queue so that the switch knows which egress to resume or pause.

PFC_PRIORITY_TO_PRIORITY_GROUP_MAP

Maps PFC priority to a priority group.

TC_TO_PRIORITY_GROUP_MAP

Maps the PFC priority to a priority group and enables the switch to set the PFC priority in xon/xoff frames in order to resume/pause corresponding egress queue at the link peer.

PORT_QOS_MAP

Defines the mappings adopted by a port, including:
– tc_to_queue_map, default value is TC_TO_QUEUE_MAP/AZURE
– dscp_to_tc_map, default value is DSCP_TO_TC_MAP/AZURE
– pfc_to_queue_map, default value is MAP_PFC_PRIORITY_TO_QUEUE/AZURE
– pfc_to_pg_map, default value is PFC_PRIORITY_TO_PRIORITY_GROUP_MAP/AZURE
– tc_to_pg_map, default value is TC_TO_PRIORITY_GROUP_MAP

admin@sonic:~$ sudo nano new_pfc.json
{
  "DSCP_TO_TC_MAP": {
     "AZURE": {
         "0": "1",
         "1": "1",
         "2": "1",
         "3": "3",
         "4": "4",
         "5": "2",
         "6": "1",
         "7": "1",
         "8": "0",
         "9": "1",
         "10": "1",
         "11": "1",
         "12": "1",
         "13": "1",
         "14": "1",
         "15": "1",
         "16": "1",
         "17": "1",
         "18": "1",
         "19": "1",
         "20": "1",
         "21": "1",
         "22": "1",
         "23": "1",
         "24": "1",
         "25": "1",
         "26": "1",
         "27": "1",
         "28": "1",
         "29": "1",
         "30": "1",
         "31": "1",
         "32": "1",
         "33": "1",
         "34": "1",
         "35": "1",
         "36": "1",
         "37": "1",
         "38": "1",
         "39": "1",
         "40": "1",
         "41": "1",
         "42": "1",
         "43": "1",
         "44": "1",
         "45": "1",
         "46": "5",
         "47": "1",
         "48": "6",
         "49": "1",
         "50": "1",
         "51": "1",
         "52": "1",
         "53": "1",
         "54": "1",
         "55": "1",
         "56": "1",
         "57": "1",
         "58": "1",
         "59": "1",
         "60": "1",
         "61": "1",
         "62": "1",
         "63": "1"
     }
   },
"MAP_PFC_PRIORITY_TO_QUEUE": {
  "AZURE": {
      "0": "0",
      "1": "1",
      "2": "2",
      "3": "3",
      "4": "4",
      "5": "5",
      "6": "6",
      "7": "7"
  }
},
"PFC_PRIORITY_TO_PRIORITY_GROUP_MAP": {
  "AZURE": {
      "3": "3",
      "4": "4"
  }
},
"PORT_QOS_MAP": {
  "Ethernet0": {
      "dscp_to_tc_map": "[DSCP_TO_TC_MAP|AZURE]",
      "pfc_enable": "3,4",
      "pfc_to_pg_map": "[PFC_PRIORITY_TO_PRIORITY_GROUP_MAP|AZURE]",
      "pfc_to_queue_map": "[MAP_PFC_PRIORITY_TO_QUEUE|AZURE]",
      "tc_to_pg_map": "[TC_TO_PRIORITY_GROUP_MAP|AZURE]",
      "tc_to_queue_map": "[TC_TO_QUEUE_MAP|AZURE]"
  }
},
"SCHEDULER": {
  "scheduler.0": {
      "type": "DWRR",
      "weight": "14"
  },
  "scheduler.1": {
      "type": "DWRR",
      "weight": "15"
  }
},
"TC_TO_PRIORITY_GROUP_MAP": {
  "AZURE": {
      "0": "0",
      "1": "0",
      "2": "0",
      "3": "3",
      "4": "4",
      "5": "0",
      "6": "0",
      "7": "7"
  }
},
"TC_TO_QUEUE_MAP": {
    "AZURE": {
        "0": "0",
        "1": "1",
        "2": "2",
        "3": "3",
        "4": "4",
        "5": "5",
        "6": "6",
        "7": "7"
    }
  }
}

Priority Flow Control – PFC

CONFIG_DB Tables

Configure PFC