802.1 Maintenance Database | ieee802-dot1q-bridge YANG model should add 'derive-from-or-self' to the bridge port augmentation's 'when' statement

Requested revision

Standard:	802.1Qcp-2018	Clause:	48.6.3.3
Clause title:	Definition for the ieee802-dot1q-bridge YANG module

Rationale for revision

Improve the bridge port augmentation of the IETF interface YANG
module by adding 'derive-from-or-self' to the 'when' statement.

The change provides functional equivalence and also allows
other users to use the Bridge Port definition without necessitating
any additional changes to the 'ieee802-dot1q-bridge.yang' module.

Proposed text

Change:

  augment "/if:interfaces/if:interface" {
    when
      "if:type = 'ianaif:bridge' or if:type ="+
      "'ianaif:ethernetCsmacd' or if:type = 'ianaif:ieee8023adLag'"+
      "or if:type = 'ianaif:ilan'" {
to
  augment "/if:interfaces/if:interface" {
    when
      "if:type = 'ianaif:bridge' or"
      "derive-from-or-self(if:type, 'ianaif:ethernetCsmacd') or" +
      "if:type = 'ianaif:ieee8023adLag' or" +
      "if:type = 'ianaif:ilan'" {

Impact on existing networks

YANG upgrade on 'ieee802-dot1q-bridge.yang' will be required.

Originator

Name:	William Zhao	Email:	william.zhao@siemens.com
Affiliation:	Siemens
Submitted:	2018-09-25