Load Balance

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Table 1 Packet Spray

Command	Purpose
hash algorithm{random\|round_robin}	Configure the hash algorithm of LAG based on packets.
hash algorithm ecmp{random\|round_robin}	Configure the hash algorithm of ECMP based on packets.

hash algorithm {random|round_robin}

[Command] hash algorithm {random|round_robin}

[Purpose] Configure the hash algorithm of LAG based on packets.

[Parameters]

Parameter	Description
random	Random hash allocation of packets.
round_robin	Sequential round-robin allocation of packets.

[View] LAGIF Configuration View

[Notes] Run commit to take effect. Defaults to hash based on five-tuple. Only CX864-N supports this feature. Run command no hash algorithm to restore to the default configuration.

[Use Cases]

sonic# configure terminal
sonic(config)# interface link-aggregation 100
sonic(config-lagif-100)# hash algorithm random
Please enter 'commit' to make hash algorithm command take effect
sonic(config-lagif-100)# commit

hash algorithm ecmp {random|round_robin}

[Command] hash algorithm ecmp {random|round_robin}

[Purpose] Configure the hash algorithm of ECMP based on packets.

[Parameters]

Parameter	Description
random	Random hash allocation of packets.
round_robin	Sequential round-robin allocation of packets.

[View] Global Configuration View

[Notes] Defaults to hash based on five-tuple. Only CX864-N supports this feature. The ECMP hash algorithm and the LAG hash algorithm are independently controlled. Please configure the hash algorithm before route distribution. If the hash algorithm is modified after routes have been distributed, the routes need to be regenerated. Run command no hash algorithm ecmp to restore to the default configuration.

[Use Cases]

onic# configure terminal
sonic(config)# hash algorithm ecmp random

ARS

ARS View

Table 2 ARS View

Command	Purpose
show ars instance	Display ARS instance configuration
show ars interface	Display the ARS status of the interface.
show ars profile	Display ARS profile configuration.

show ars instance

[Command] show ars instance

[Purpose] Display ARS instance configuration.

[View] Privileged User View

[Use Cases]

sonic# show ars instance
Instance Name    Assign Mode            Idle Time    Max Flows  Binding Status
---------------  -------------------  -----------  -----------  ----------------
test             per_flowlet_quality          256          512  N/A

show ars interface

[Command] show ars instance

[Purpose] Display the ARS status of the interface.

[View] Privileged User View

[Use Cases]

sonic# show ars interface
Interface    Status       Scaling Factor
-----------  -----------  ----------------
0/0          Enabled      10000
0/1          Enabled      10000
0/2          Enabled      10000
0/3          Enabled      10000
0/4          Enabled      10000
0/5          Enabled      10000
0/6          Enabled      10000
0/7          Enabled      10000
0/8          Enabled      10000
……

show ars profile

[Command] show ars profile

[Purpose] Display ARS profile configuration.

[View] Privileged User View

[Use Cases]

sonic# show ars profile
Algorithm    IPv4 Enable    IPv6 Enable      Load Past Min    Load Past Max    Overall Max Flows    Remaining Max Flows
-----------  -------------  -------------  ---------------  ---------------  -------------------  ---------------------
EWMA         True           True                         0             4096                 8128                   7616

ARS Config

Table 3 ARS Config

Command	Purpose
ars profile	Create ARS profile.
ars instance instance_name	Create ARS instance.
ars nexthop-group {A.B.C.D/M\|A::B/M} instance* instance_name*	Bind the ARS instance to an ECMP group.
idle-time time_value	Set the flow splitting interval
max-flows flow_value	Set the maximum number of flowlets that ECMP can track simultaneously in macro-flow.
ars disable	Disable ARS at interface level.

ars profile

[Command] ars profile

[Purpose] Create ARS profile.

[View] Global Configuration View.

[Notes] Enable ARS globally and create a profile to automatically bind to the switch. This will take effect globally. Currently, the device supports only one profile. Run command no ars profile to delete the ARS profile.

[Use Cases]

sonic# configure terminal
sonic(config)# ars profile
sonic(config-arsprofile)# show this
!
ars profile

ars instance

[Command] ars instance instance_name

[Purpose] Create ARS instance.

[Parameters]

Parameter	Description
instance_name	Name of ARS instance, in string form

[View] Global Configuration View.

[Notes] Run command no ars instance instance_name to delete the ARS instance .

[Use Cases]

sonic# configure terminal
sonic(config)# ars instance test
sonic(config-ars-instance-test)# show this
!
ars instance test

ars nexthop-group {

[Command] ars nexthop-group {A.B.C.D/M|A::B/M} instance instance_name

[Purpose] Bind the ARS instance to an ECMP group.

[Parameters]

Parameter	Description
A.B.C.D/M	IPv4 destination address, bound to the ECMP group where the next hop of the destination address belongs.
A::B/M	IPv6 destination address, bound to the ECMP group where the next hop of the destination address belongs.
instance_name	Name of ARS instance, in string form.

[View] Global Configuration View.

[Notes] ECMP groups and ARS instances can only be bound one-to-one. Run command no ars nexthop-group {A.B.C.D/M |A::B/M} instance instance_name to delete the bond with ECMP group.

[Use Cases]

sonic# configure terminal
sonic(config)# ars instance test
sonic(config-ars-instance-test)# exit
sonic(config)# ars nexthop-group 10.0.0.0/24 instance test

idle-time time_value

[Command] idle-time time_value

[Purpose] Set the flow splitting interval.

[Parameters]

Parameter	Description
time_value	Idle duration in microseconds. The range is 1-1048, and the default value is 256.

[View] Flow splitting is triggered if the frame interval exceeds this time; ARS instance Configuration View.

[Notes] Run command no idle-time to restore the idle duration value to the default value.

[Use Cases]

sonic# configure terminal
sonic(config)# ars instance test
sonic(config-ars-instance-test)# idle-time 200
sonic(config-ars-instance-test)# show this
!
ars instance test
 idle-time 200

max-flows

[Command] max-flows flow_value

[Purpose] Set the maximum number of flowlet that ECMP group can track simultaneously in macro-flow table.

[Parameters]

Parameter	Description
flow_value	The number of flowlet, optional parameters 32/64/ 128/256/512/1k/2k, and the default value is 512.

[View] ARS instance Configuration View.

[Notes] It is recommended to use the default value. Run command no max-flows to restore the number of flowlet to the default value.

[Use Cases]

sonic# configure terminal
sonic(config)# ars instance test
sonic(config-ars-instance-test)# max-flows 1k
!
ars instance test
 max-flows 1k

ars disable

[Command] ars disable

[Purpose] Disable ARS at interface-level.

[View] Physical Interface Configuration View.

[Notes] Run command no ars disable to enable ARS.

[Use Cases]

sonic# configure terminal
sonic(config)# interface ethernet 0/400
sonic(config-if-0/400)# ars disable
sonic(config-if-0/400)# show this
!
interface ethernet 0/400
 ars disable
 fec rs
 mtu 9216
 speed 800000