Augmenting%20YANG%20Groupings

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• Augmenting YANG Groupings
• Balazs Lengyel balazs.lengyel_at_ericsson.com
• Bernd Linowski bernd.linowski_at_nsn.com

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Augmentable Groupings for YANG
draft-ietf-ipfix-configuration-model-00.txt

• Use Case
• Adding missing parts to a grouping for reuse in
  multiple places
• Avoid augmenting all uses individually
• less overhead
• less error-prone
• IPFIX Example Enhancing grouping
  InformationElement

grouping InformationElement description
"Parameters of an
Information Element." leaf
ieEnterpriseNumber // // list field
// uses InformationElement
// list optionField // uses
InformationElement
augment /ipfix-psampInformationElement
leaf ext
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Potential Issues

• Augmenting a grouping affects all modules the
  grouping is used
• This is the desired feature!
• Augmented elements should be in the namespace of
  the augment statement
• Makes augmentable groupings consistent with
  augmenting a list, container, etc.
• Avoids name clashes
• Dealing with augmented elements in other
  namespaces is a well known side-effect, e.g.
  augmenting of a list

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