SONiC Generic Hash

High Level Design document

Table of contents

• Revision

• About this manual

• Scope

• Abbreviations

• 1 Introduction

  • 1.1 Feature overview

  • 1.2 Requirements

    • 1.2.1 Functionality

    • 1.2.2 Command interface

    • 1.2.3 Error handling

    • 1.2.4 Event logging

• 2 Design

  • 2.1 Overview

  • 2.2 SAI API

  • 2.3 Orchestration agent

    • 2.3.1 Overview

    • 2.3.2 Switch orch

  • 2.4 DB schema

    • 2.4.1 Config DB

      • 2.4.1.1 Switch hash

    • 2.4.2 State DB

      • 2.4.2.1 Switch hash capabilities

    • 2.4.3 Data sample

    • 2.4.4 Configuration sample

  • 2.5 Flows

    • 2.5.1 Config section

      • 2.5.1.1 GH update

    • 2.5.2 Show section

      • 2.5.2.1 GH show

      • 2.5.2.2 GH show capabilities

  • 2.6 CLI

    • 2.6.1 Command structure

    • 2.6.2 Usage examples

      • 2.6.2.1 Config command group

      • 2.6.2.2 Show command group

  • 2.7 YANG model

  • 2.8 Warm/Fast boot

• 3 Test plan

  • 3.1 Unit tests via VS

  • 3.2 Data plane tests via PTF

Revision

About this manual

This document provides general information about GH implementation in SONiC

Scope

This document describes the high level design of GH feature in SONiC

In scope:​

1. ECMP/LAG switch hash configuration

2. ECMP/LAG switch hash algorithm configuration

Out of scope:​

1. ECMP/LAG switch hash seed configuration

2. ECMP/LAG switch hash offset configuration

Abbreviations

List of figures

Figure 1: GH design

Figure 2: GH OA design

Figure 3: GH update flow

Figure 4: GH show flow

Figure 5: GH show capabilities flow

List of tables

Table 1: Frontend event logging

Table 2: Backend event logging

1 Introduction

1.1 Feature overview

The hashing algorithm is used to make traffic-forwarding decisions for traffic exiting the switch.It makes hashing decisions based on values in various packet fields, as well as on the hash seed value.The packet fields used by the hashing algorithm varies by the configuration on the switch.

For ECMP, the hashing algorithm determines how incoming traffic is forwarded to the next-hop device.For LAG, the hashing algorithm determines how traffic is placed onto the LAG member links to managebandwidth by evenly load-balancing traffic across the outgoing links.

GH is a feature which allows user to configure various aspects of hashing algorithm.GH provides global switch hash configuration for ECMP and LAG.

1.2 Requirements

1.2.1 Functionality

This feature will support the following functionality:​

1. Ethernet packet hashing configuration with inner/outer IP frames

2. Global switch hash configuration for ECMP and LAG

3. Warm/Fast reboot

1.2.2 Command interface

This feature will support the following commands:​

1. config: set switch hash global configuration

2. show: display switch hash global configuration

1.2.3 Error handling

1.2.3.1 Frontend

This feature will provide error handling for the next situations:​

1. Invalid parameter value

1.2.3.2 Backend

This feature will provide error handling for the next situations:​

1. Missing parameters

2. Invalid parameter value

3. Parameter removal

4. Configuration removal

1.2.4 Event logging

1.2.4.1 Frontend

This feature will provide event logging for the next situations:​

1. Switch hash update

Table 1: Frontend event logging

1.2.4.2 Backend

This feature will provide event logging for the next situations:​

1. Missing parameters

2. Invalid parameter value

3. Parameter value with duplicate items

4. Parameter removal

5. Configuration removal

6. Switch hash update

Table 2: Backend event logging

2 Design

2.1 Overview

Figure 1: GH design

GH will use SAI Hash API to configure various aspects of hashing algorithm to ASIC.Hashing policy can be set independently for ECMP and LAG.

GH important notes:​

1. According to the SAI Behavioral Model, the hash is calculated on ingress to pipeline

2. SAI configuration of hash fields is applicable to original packet before any DECAP/ENCAP, i.e. configuration is tunnel-agnostic

3. If some configured hash field is not present in an incoming packet, then zero is assumed for hash calculation

2.2 SAI API

SAI native hash fields which shall be used for GH:​

SAI hash algorithms which shall be used for GH:​

SAI attributes which shall be used for GH:​

2.3 Orchestration agent

2.3.1 Overview

Figure 2: GH OA design

The existing SwitchOrch class will be extended with a new APIs to implement GH feature.OA will be extended with a new GH Config DB schema and SAI Hash API support.Switch hash updates will be processed by OA based on Config DB changes.Some updates will be handled and some will be considered as invalid.

2.3.2 Switch orch

Class SwitchOrch holds a set of methods matching generic Orch class pattern to handle Config DB updates.For that purpose a producer-consumer mechanism (implemented in sonic-swss-common) is used.Method SwitchOrch::doTask() will be called on switch hash update. It will distribute handlingof DB updates between other handlers based on the table key updated (Redis Keyspace Notifications).

This class is responsible for:

1. Processing updates of switch hash

2. Partial input data validation

3. Replicating data from Config DB to SAI DB via SAI Redis

4. Caching objects in order to handle updates

Switch hash object is stored under SWITCH_HASH|GLOBAL key in Config DB. On SWITCH_HASH update,method SwitchOrch::doCfgSwitchHashTableTask() will be called to process the change.Regular switch hash update will refresh the internal class structures and appropriate SAI objects.

Switch hash capabilities are stored under SWITCH_CAPABILITY|switch key in State DB.The vendor specific data is being queried by switch OA on init and pushed to both internal cache and DB.Any further switch hash update is being validated using vendor specific hash capabilities.

Skeleton code:​

class SwitchOrch : public Orch
{
    ...

private:
    void doCfgSwitchHashTableTask(Consumer &consumer);
    void doTask(Consumer &consumer);

    // Switch hash
    bool setSwitchHashFieldListSai(sai_object_id_t oid, std::vector<sai_int32_t> &hfList) const;
    bool setSwitchHashEcmpHash(const SwitchHash &hash) const;
    bool setSwitchHashLagHash(const SwitchHash &hash) const;
    bool setSwitchHash(const SwitchHash &hash);

    bool getSwitchHashOidSai(sai_object_id_t &oid, bool isEcmpHashOid) const;
    void getSwitchHashEcmpOid();
    void getSwitchHashLagOid();
    void querySwitchHashDefaults();

    // Switch hash SAI defaults
    struct {
        struct {
            sai_object_id_t oid = SAI_NULL_OBJECT_ID;
        } ecmpHash;
        struct {
            sai_object_id_t oid = SAI_NULL_OBJECT_ID;
        } lagHash;
    } m_switchHashDefaults;

    // Switch OA helper
    SwitchHelper swHlpr;

    ...
};

2.4 DB schema

2.4.1 Config DB

2.4.1.1 Switch hash

; defines schema for switch hash configuration attributes
key = SWITCH_HASH|GLOBAL ; switch hash global. Must be unique

; field             = value
ecmp_hash           = hash-field-list ; hash fields for hashing packets going through ECMP
lag_hash            = hash-field-list ; hash fields for hashing packets going through LAG
ecmp_hash_algorithm = hash-algorithm  ; hash algorithm for hashing packets going through ECMP
lag_hash_algorithm  = hash-algorithm  ; hash algorithm for hashing packets going through LAG

; value annotations
hash-field      = "IN_PORT"
                / "DST_MAC"
                / "SRC_MAC"
                / "ETHERTYPE"
                / "VLAN_ID"
                / "IP_PROTOCOL"
                / "DST_IP"
                / "SRC_IP"
                / "L4_DST_PORT"
                / "L4_SRC_PORT"
                / "INNER_DST_MAC"
                / "INNER_SRC_MAC"
                / "INNER_ETHERTYPE"
                / "INNER_IP_PROTOCOL"
                / "INNER_DST_IP"
                / "INNER_SRC_IP"
                / "INNER_L4_DST_PORT"
                / "INNER_L4_SRC_PORT"
                / "IPV6_FLOW_LABEL"
hash-field-list = hash-field [ 1*( "," hash-field ) ]
hash-algorithm  = "CRC"
                / "XOR"
                / "RANDOM"
                / "CRC_32LO"
                / "CRC_32HI"
                / "CRC_CCITT"
                / "CRC_XOR"

2.4.2 State DB

2.4.2.1 Switch hash capabilities

; defines schema for switch hash configuration capabilities
key = SWITCH_CAPABILITY|switch ; must be unique

; field                     = value
ECMP_HASH_CAPABLE           = capability-knob ; specifies whether switch is ECMP hash capable
LAG_HASH_CAPABLE            = capability-knob ; specifies whether switch is LAG hash capable
HASH|NATIVE_HASH_FIELD_LIST = hash-field-list ; hash field capabilities for hashing packets going through switch
ECMP_HASH_ALGORITHM_CAPABLE = capability-knob ; specifies whether switch is ECMP hash algorithm capable
LAG_HASH_ALGORITHM_CAPABLE  = capability-knob ; specifies whether switch is LAG hash algorithm capable
ECMP_HASH_ALGORITHM         = hash-algorithm  ; hash algorithm capabilities for hashing packets going through ECMP
LAG_HASH_ALGORITHM          = hash-algorithm  ; hash algorithm capabilities for hashing packets going through LAG

; value annotations
capability-knob = "true" / "false"
hash-field      = ""
                / "N/A"
                / "IN_PORT"
                / "DST_MAC"
                / "SRC_MAC"
                / "ETHERTYPE"
                / "VLAN_ID"
                / "IP_PROTOCOL"
                / "DST_IP"
                / "SRC_IP"
                / "L4_DST_PORT"
                / "L4_SRC_PORT"
                / "INNER_DST_MAC"
                / "INNER_SRC_MAC"
                / "INNER_ETHERTYPE"
                / "INNER_IP_PROTOCOL"
                / "INNER_DST_IP"
                / "INNER_SRC_IP"
                / "INNER_L4_DST_PORT"
                / "INNER_L4_SRC_PORT"
                / "IPV6_FLOW_LABEL"
hash-field-list = hash-field [ 1*( "," hash-field ) ]
hash-algorithm  = ""
                / "N/A"
                / "CRC"
                / "XOR"
                / "RANDOM"
                / "CRC_32LO"
                / "CRC_32HI"
                / "CRC_CCITT"
                / "CRC_XOR"

2.4.3 Data sample

Config DB:​

redis-cli -n 4 HGETALL 'SWITCH_HASH|GLOBAL'
1) "ecmp_hash@"
2) "DST_MAC,SRC_MAC,ETHERTYPE,IP_PROTOCOL,DST_IP,SRC_IP,L4_DST_PORT,L4_SRC_PORT, \
INNER_DST_MAC,INNER_SRC_MAC,INNER_ETHERTYPE,INNER_IP_PROTOCOL,INNER_DST_IP,INNER_SRC_IP,INNER_L4_DST_PORT,INNER_L4_SRC_PORT,IPV6_FLOW_LABEL"
3) "lag_hash@"
4) "DST_MAC,SRC_MAC,ETHERTYPE,IP_PROTOCOL,DST_IP,SRC_IP,L4_DST_PORT,L4_SRC_PORT, \
INNER_DST_MAC,INNER_SRC_MAC,INNER_ETHERTYPE,INNER_IP_PROTOCOL,INNER_DST_IP,INNER_SRC_IP,INNER_L4_DST_PORT,INNER_L4_SRC_PORT,IPV6_FLOW_LABEL"
5) "ecmp_hash_algorithm"
6) "CRC"
7) "lag_hash_algorithm"
8) "CRC"

State DB:​

redis-cli -n 6 HGETALL 'SWITCH_CAPABILITY|switch'
 1) "ECMP_HASH_CAPABLE"
 2) "true"
 3) "LAG_HASH_CAPABLE"
 4) "true"
 5) "HASH|NATIVE_HASH_FIELD_LIST"
 6) "IN_PORT,DST_MAC,SRC_MAC,ETHERTYPE,VLAN_ID,IP_PROTOCOL,DST_IP,SRC_IP,L4_DST_PORT,L4_SRC_PORT, \
INNER_DST_MAC,INNER_SRC_MAC,INNER_ETHERTYPE,INNER_IP_PROTOCOL,INNER_DST_IP,INNER_SRC_IP, \
INNER_L4_DST_PORT,INNER_L4_SRC_PORT,IPV6_FLOW_LABEL"
 7) "ECMP_HASH_ALGORITHM_CAPABLE"
 8) "true"
 9) "LAG_HASH_ALGORITHM_CAPABLE"
10) "true"
11) "ECMP_HASH_ALGORITHM"
12) "CRC,XOR,RANDOM,CRC_32LO,CRC_32HI,CRC_CCITT,CRC_XOR"
13) "LAG_HASH_ALGORITHM"
14) "CRC,XOR,RANDOM,CRC_32LO,CRC_32HI,CRC_CCITT,CRC_XOR"

2.4.4 Configuration sample

Outer/Inner frame hashing:​

{
    "SWITCH_HASH": {
        "GLOBAL": {
            "ecmp_hash": [
                "DST_MAC",
                "SRC_MAC",
                "ETHERTYPE",
                "IP_PROTOCOL",
                "DST_IP",
                "SRC_IP",
                "L4_DST_PORT",
                "L4_SRC_PORT",
                "INNER_DST_MAC",
                "INNER_SRC_MAC",
                "INNER_ETHERTYPE",
                "INNER_IP_PROTOCOL",
                "INNER_DST_IP",
                "INNER_SRC_IP",
                "INNER_L4_DST_PORT",
                "INNER_L4_SRC_PORT",
                "IPV6_FLOW_LABEL"
            ],
            "lag_hash": [
                "DST_MAC",
                "SRC_MAC",
                "ETHERTYPE",
                "IP_PROTOCOL",
                "DST_IP",
                "SRC_IP",
                "L4_DST_PORT",
                "L4_SRC_PORT",
                "INNER_DST_MAC",
                "INNER_SRC_MAC",
                "INNER_ETHERTYPE",
                "INNER_IP_PROTOCOL",
                "INNER_DST_IP",
                "INNER_SRC_IP",
                "INNER_L4_DST_PORT",
                "INNER_L4_SRC_PORT",
                "IPV6_FLOW_LABEL"
            ],
            "ecmp_hash_algorithm": "CRC",
            "lag_hash_algorithm": "CRC"
        }
    }
}

2.5 Flows

2.5.1 Config section

2.5.1.1 GH update

Figure 3: GH update flow

Note:​

The list of available hash fields will be queried by sai_query_attribute_enum_values_capability in two steps.The first attempt is used to accommodate the target list size after getting SAI_STATUS_BUFFER_OVERFLOW return code.And the second one is for getting the actual data.

2.5.2 Show section

2.5.2.1 GH show

Figure 4: GH show flow

2.5.2.2 GH show capabilities

Figure 5: GH show capabilities flow

2.6 CLI

2.6.1 Command structure

User interface:

config
|--- switch-hash
     |--- global
          |--- ecmp-hash ARGS
          |--- lag-hash ARGS
          |--- ecmp-hash-algorithm ARG
          |--- lag-hash-algorithm ARG

show
|--- switch-hash
     |--- global
     |--- capabilities

2.6.2 Usage examples

2.6.2.1 Config command group

The following command updates switch hash global:​

config switch-hash global ecmp-hash \
'DST_MAC' \
'SRC_MAC' \
'ETHERTYPE' \
'IP_PROTOCOL' \
'DST_IP' \
'SRC_IP' \
'L4_DST_PORT' \
'L4_SRC_PORT' \
'INNER_DST_MAC' \
'INNER_SRC_MAC' \
'INNER_ETHERTYPE' \
'INNER_IP_PROTOCOL' \
'INNER_DST_IP' \
'INNER_SRC_IP' \
'INNER_L4_DST_PORT' \
'INNER_L4_SRC_PORT' \
'IPV6_FLOW_LABEL'
config switch-hash global lag-hash \
'DST_MAC' \
'SRC_MAC' \
'ETHERTYPE' \
'IP_PROTOCOL' \
'DST_IP' \
'SRC_IP' \
'L4_DST_PORT' \
'L4_SRC_PORT' \
'INNER_DST_MAC' \
'INNER_SRC_MAC' \
'INNER_ETHERTYPE' \
'INNER_IP_PROTOCOL' \
'INNER_DST_IP' \
'INNER_SRC_IP' \
'INNER_L4_DST_PORT' \
'INNER_L4_SRC_PORT' \
'IPV6_FLOW_LABEL'

The following command updates switch hash algorithm global:​

config switch-hash global ecmp-hash-algorithm 'CRC'
config switch-hash global lag-hash-algorithm 'CRC'

2.6.2.2 Show command group

The following command shows switch hash global configuration:​

root@sonic:/home/admin# show switch-hash global
+--------+-------------------------------------+
| Hash   | Configuration                       |
+========+=====================================+
| ECMP   | +-------------------+-------------+ |
|        | | Hash Field        | Algorithm   | |
|        | |-------------------+-------------| |
|        | | DST_MAC           | CRC         | |
|        | | SRC_MAC           |             | |
|        | | ETHERTYPE         |             | |
|        | | IP_PROTOCOL       |             | |
|        | | DST_IP            |             | |
|        | | SRC_IP            |             | |
|        | | L4_DST_PORT       |             | |
|        | | L4_SRC_PORT       |             | |
|        | | INNER_DST_MAC     |             | |
|        | | INNER_SRC_MAC     |             | |
|        | | INNER_ETHERTYPE   |             | |
|        | | INNER_IP_PROTOCOL |             | |
|        | | INNER_DST_IP      |             | |
|        | | INNER_SRC_IP      |             | |
|        | | INNER_L4_DST_PORT |             | |
|        | | INNER_L4_SRC_PORT |             | |
|        | | IPV6_FLOW_LABEL   |             | |
|        | +-------------------+-------------+ |
+--------+-------------------------------------+
| LAG    | +-------------------+-------------+ |
|        | | Hash Field        | Algorithm   | |
|        | |-------------------+-------------| |
|        | | DST_MAC           | CRC         | |
|        | | SRC_MAC           |             | |
|        | | ETHERTYPE         |             | |
|        | | IP_PROTOCOL       |             | |
|        | | DST_IP            |             | |
|        | | SRC_IP            |             | |
|        | | L4_DST_PORT       |             | |
|        | | L4_SRC_PORT       |             | |
|        | | INNER_DST_MAC     |             | |
|        | | INNER_SRC_MAC     |             | |
|        | | INNER_ETHERTYPE   |             | |
|        | | INNER_IP_PROTOCOL |             | |
|        | | INNER_DST_IP      |             | |
|        | | INNER_SRC_IP      |             | |
|        | | INNER_L4_DST_PORT |             | |
|        | | INNER_L4_SRC_PORT |             | |
|        | | IPV6_FLOW_LABEL   |             | |
|        | +-------------------+-------------+ |
+--------+-------------------------------------+

The following command shows switch hash capabilities:​

root@sonic:/home/admin# show switch-hash capabilities
+--------+-------------------------------------+
| Hash   | Capabilities                        |
+========+=====================================+
| ECMP   | +-------------------+-------------+ |
|        | | Hash Field        | Algorithm   | |
|        | |-------------------+-------------| |
|        | | IN_PORT           | CRC         | |
|        | | DST_MAC           | XOR         | |
|        | | SRC_MAC           | RANDOM      | |
|        | | ETHERTYPE         | CRC_32LO    | |
|        | | VLAN_ID           | CRC_32HI    | |
|        | | IP_PROTOCOL       | CRC_CCITT   | |
|        | | DST_IP            | CRC_XOR     | |
|        | | SRC_IP            |             | |
|        | | L4_DST_PORT       |             | |
|        | | L4_SRC_PORT       |             | |
|        | | INNER_DST_MAC     |             | |
|        | | INNER_SRC_MAC     |             | |
|        | | INNER_ETHERTYPE   |             | |
|        | | INNER_IP_PROTOCOL |             | |
|        | | INNER_DST_IP      |             | |
|        | | INNER_SRC_IP      |             | |
|        | | INNER_L4_DST_PORT |             | |
|        | | INNER_L4_SRC_PORT |             | |
|        | | IPV6_FLOW_LABEL   |             | |
|        | +-------------------+-------------+ |
+--------+-------------------------------------+
| LAG    | +-------------------+-------------+ |
|        | | Hash Field        | Algorithm   | |
|        | |-------------------+-------------| |
|        | | IN_PORT           | CRC         | |
|        | | DST_MAC           | XOR         | |
|        | | SRC_MAC           | RANDOM      | |
|        | | ETHERTYPE         | CRC_32LO    | |
|        | | VLAN_ID           | CRC_32HI    | |
|        | | IP_PROTOCOL       | CRC_CCITT   | |
|        | | DST_IP            | CRC_XOR     | |
|        | | SRC_IP            |             | |
|        | | L4_DST_PORT       |             | |
|        | | L4_SRC_PORT       |             | |
|        | | INNER_DST_MAC     |             | |
|        | | INNER_SRC_MAC     |             | |
|        | | INNER_ETHERTYPE   |             | |
|        | | INNER_IP_PROTOCOL |             | |
|        | | INNER_DST_IP      |             | |
|        | | INNER_SRC_IP      |             | |
|        | | INNER_L4_DST_PORT |             | |
|        | | INNER_L4_SRC_PORT |             | |
|        | | IPV6_FLOW_LABEL   |             | |
|        | +-------------------+-------------+ |
+--------+-------------------------------------+

2.7 YANG model

Existing YANG model template sonic-types.yang.j2 at sonic-buildimage/src/sonic-yang-models/yang-templateswill be extended with a new common type.

Skeleton code:​

    typedef hash-field {
        description "Represents native hash field";
        type enumeration {
            enum IN_PORT;
            enum DST_MAC;
            enum SRC_MAC;
            enum ETHERTYPE;
            enum VLAN_ID;
            enum IP_PROTOCOL;
            enum DST_IP;
            enum SRC_IP;
            enum L4_DST_PORT;
            enum L4_SRC_PORT;
            enum INNER_DST_MAC;
            enum INNER_SRC_MAC;
            enum INNER_ETHERTYPE;
            enum INNER_IP_PROTOCOL;
            enum INNER_DST_IP;
            enum INNER_DST_IPV4;
            enum INNER_DST_IPV6;
            enum INNER_SRC_IP;
            enum INNER_SRC_IPV4;
            enum INNER_SRC_IPV6;
            enum INNER_L4_DST_PORT;
            enum INNER_L4_SRC_PORT;
            enum IPV6_FLOW_LABEL;
        }
    }

    typedef hash-algorithm {
        description "Represents hash algorithm";
        type enumeration {
            enum CRC;
            enum XOR;
            enum RANDOM;
            enum CRC_32LO;
            enum CRC_32HI;
            enum CRC_CCITT;
            enum CRC_XOR;
        }
    }

New YANG model sonic-hash.yang will be added to sonic-buildimage/src/sonic-yang-models/yang-modelsin order to extend existing data schema and provide support for GH.

Skeleton code:​

module sonic-hash {

    yang-version 1.1;

    namespace "http://github.com/sonic-net/sonic-hash";
    prefix hash;

    import sonic-types {
        prefix stypes;
    }

    description "HASH YANG Module for SONiC OS";

    revision 2022-09-05 {
        description "First Revision";
    }

    typedef hash-field {
        description "Represents native hash field";
        type stypes:hash-field {
            enum IN_PORT;
            enum DST_MAC;
            enum SRC_MAC;
            enum ETHERTYPE;
            enum VLAN_ID;
            enum IP_PROTOCOL;
            enum DST_IP;
            enum SRC_IP;
            enum L4_DST_PORT;
            enum L4_SRC_PORT;
            enum INNER_DST_MAC;
            enum INNER_SRC_MAC;
            enum INNER_ETHERTYPE;
            enum INNER_IP_PROTOCOL;
            enum INNER_DST_IP;
            enum INNER_SRC_IP;
            enum INNER_L4_DST_PORT;
            enum INNER_L4_SRC_PORT;
            enum IPV6_FLOW_LABEL;
        }
    }

    container sonic-hash {

        container SWITCH_HASH {

            description "SWITCH_HASH part of config_db.json";

            container GLOBAL {

                leaf-list ecmp_hash {
                    description "Hash fields for hashing packets going through ECMP";
                    type hash:hash-field;
                }

                leaf-list lag_hash  {
                    description "Hash fields for hashing packets going through LAG";
                    type hash:hash-field;
                }

                leaf ecmp_hash_algorithm {
                    description "Hash algorithm for hashing packets going through ECMP";
                    type stypes:hash-algorithm;
                }

                leaf lag_hash_algorithm {
                    description "Hash algorithm for hashing packets going through LAG";
                    type stypes:hash-algorithm;
                }

            }
            /* end of container GLOBAL */
        }
        /* end of container SWITCH_HASH */
    }
    /* end of container sonic-hash */
}
/* end of module sonic-hash */

2.8 Warm/Fast boot

No special handling is required

3 Test plan

3.1 Unit tests via VS

GH basic configuration test:

1. Verify ASIC DB object state after switch ECMP hash update

2. Verify ASIC DB object state after switch LAG hash update

3. Verify ASIC DB object state after switch ECMP hash algorithm update

4. Verify ASIC DB object state after switch LAG hash algorithm update

3.2 Data plane tests via PTF

1. Generic Hash Test Plan