Add W-ECMP CLI

[nazariig]

HLD: sonic-net/SONiC#1629

What I did

• Implemented CLI for Weighted-Cost Multi-Path feature

How I did it

• Integrated Weighted-Cost Multi-Path interface into config and show CLI root

How to verify it

1. Run Weighted-Cost Multi-Path CLI UTs

Previous command output (if the output of a command-line utility has changed)

• N/A

New command output (if the output of a command-line utility has changed)

admin@sonic:/home/admin# show bgp device-global
TSA      WCMP
-------  -------
enabled  enabled
admin@sonic:/home/admin# show bgp device-global --json
{
    "tsa": "enabled",
    "wcmp": "enabled"
}

[liat-grozovik]

@venkatmahalingam would you mind to provide code PR review feedback as well?

[tjchadaga]

@nazariig - what is the expected output of the CLI on a multi-asic device?

[tjchadaga]

@nazariig - could you please clarify why TSA and WCMP are combined here, instead of a CLI dedicated to WCMP?

[nazariig]

@nazariig - what is the expected output of the CLI on a multi-asic device?

@tjchadaga multi-asic is out of scope

[nazariig]

@nazariig - could you please clarify why TSA and WCMP are combined here, instead of a CLI dedicated to WCMP?

@tjchadaga they use the same configuration key and both are global features, so were put on the same table.

[tjchadaga]

@nazariig - could you please clarify why TSA and WCMP are combined here, instead of a CLI dedicated to WCMP?

@tjchadaga they use the same configuration key and both are global features, so were put on the same table.

@nazariig - would this CLI output need to be updated each time new bgp global features are added?

[nazariig]

@nazariig - could you please clarify why TSA and WCMP are combined here, instead of a CLI dedicated to WCMP?

@tjchadaga they use the same configuration key and both are global features, so were put on the same table.

@nazariig - would this CLI output need to be updated each time new bgp global features are added?

@tjchadaga if the original YANG model is going to be reused and extended - the answer is yes