Loopback package

Provided a device name this package will allocate an configure an address on its loopback interface. The goal is to demonstrate the use of kickers to implement an external resource manager. Resource allocations are tracked in a JSON file.

There is also code to demonstrate using custom validators in python. This is used to validate the description field.

Initial setup

The resource allocations file 'resource-pools.json' is automatically created with some predefined defaults if it doesn't yet exist. The default pool created is 'pool-1'.

The setup container is used primarily to configure the kickers (i.e. applying setup-template.xml). It needs to be configured before devices can be specified.

admin@ncs(config)# services loopback ?
Possible completions:
  setup  <cr>
admin@ncs(config)# services loopback setup
admin@ncs(config-loopback)# commit
Commit complete.

In order to view the configured kickers we need to create and unhide the debug group:

a. Add the following to ncs.conf file and restart NSO:

<hide-group>
    <name>debug</name>
</hide-group>

b. Unhide the debug group via cli:

admin@ncs# unhide debug

c. Show running kickers:

admin@ncs# show running-config kickers
kickers data-kicker resource-diff-iter
 monitor      /loopback:external-resource-manager/loopback:id-pool/loopback:allocation
 trigger-expr request
 kick-node    /external-resource-manager
 action-name  diff-iter
!
<snip>

Specifying device to configure the loopback

admin@ncs(config)# services loopback device IOS-0
admin@ncs(config-device-IOS-0)# commit