Re: [802.3_YANG] Yanglint for config validatation

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On Wed, Jun 10, 2020 at 12:30 PM Don Fedyk <dfedyk@xxxxxxxx> wrote:

Hi

(I’m hoping the message makes it through the reflectors after re-subscribing ).
I used Yanglint on the lldp modules. 802.1Qcz
Attached is a test file and some output. Note I fixed some warnings in yanglint. (yanglint require full prefixes in the YANG file.)

Using yanglint for this is fairly straight forward but the config it a bit tedious.
How I do it:
I create an XML file (sample attached) that has the following format:

<if:interfaces
   xmlns:if="urn:ietf:params:xml:ns:yang:ietf-interfaces"
   xmlns:ia="urn:ietf:params:xml:ns:yang:iana-if-type">
<!—the prefix is shortened to a small set “if” etc you can use the full one but the xml is verbose.-->
<if:interface>
      <if:name>eth0</if:name>
      <if:type>ia:ethernetCsmacd</if:type>
      
    </if:interface>

The XML I generate from the tree file an using only read/write objects. You can do read only objects too but then you need to fill in a lot of data that may no be obvious and the conditional yang kicks in. I tried interfaces and it keep wanting more and more data.
You can use the output of pyang that produces xml. I find it faster to build my own tags.
You need to follow the tree structure but the order in the tree is not strict.
I use group substitution to change “interface” into <if:interface> and duplicate and change the second occurrence to </if:interface>

Then with a file of begin/end tags I add the tree structure.

<ll:lldp
xmlns:ll="urn:ieee:std:802.1AB:yang:ieee802-dot1ab-lldp"
xmlns:ab="urn:ieee:std:802.1Q:yang:ieee802-dot1ab-types"
xmlns:llb="urn:ieee:std:802.1Q:yang:ieee802-dot1q-lldp-basic-tlv"
xmlns:lle="urn:ieee:std:802.1Q:yang:ieee802-dot1q-lldp-evb-tlv"
  xmlns:lld="urn:ieee:std:802.1Q:yang:ieee802-dot1q-lldp-dcbx-tlv"
  xmlns:llc="urn:ieee:std:802.1Q:yang:ieee802-dot1q-lldp-cn-tlv"
  xmlns:lli="urn:ieee:std:802.1Q:yang:ieee802-dot1q-lldp-ci-tlv"
  xmlns:llr="urn:ieee:std:802.1Q:yang:ieee802-dot1q-lldp-tr-tlv"
  xmlns:rt="urn:ietf:params:xml:ns:yang:ietf-routing-types"
xmlns:yt="urn:ietf:params:xml:ns:yang:ietf-yang-types"
xmlns:if="urn:ietf:params:xml:ns:yang:ietf-interfaces"
xmlns:ia="urn:ietf:params:xml:ns:yang:iana-if-type">
<ll:lldp-id>lldp1</ll:lldp-id>
  <ll:message-fast-tx>100</ll:message-fast-tx>
<ll:message-tx-hold-multiplier>2</ll:message-tx-hold-multiplier>
<ll:message-tx-interval>30</ll:message-tx-interval>
<ll:reinit-delay>2</ll:reinit-delay>
<ll:tx-credit-max>5</ll:tx-credit-max>
<ll:tx-fast-init>4</ll:tx-fast-init>
<ll:notification-interval>30</ll:notification-interval>
<llr:topology-recognition-tlv-extension>
    <llr:topology-level>2</llr:topology-level>
</llr:topology-recognition-tlv-extension>

Then I run Yanglint and load the modules. I prefer the json output.
$ yanglint
> load iana-if-type
> load ieee802-dot1ab-lldp
> load ieee802-dot1q-lldp-basic-tlv
> load ieee802-dot1q-lldp-evb-tlv
> load ieee802-dot1q-lldp-dcbx-tlv
> load ieee802-dot1q-lldp-cn-tlv
> load ieee802-dot1q-lldp-cn-tlv
> load ieee802-dot1q-lldp-tr-tlv
> data -t config   -f json test-lldp_basic1.xml

{
"ietf-interfaces:interfaces": {
    "interface": [
      {
        "name": "eth0",
        "type": "iana-if-type:ethernetCsmacd",
        "ieee802-dot1q-bridge:bridge-port": {

        }
      },
      {
        "name": "eth1",
        "type": "iana-if-type:ethernetCsmacd",
        "ieee802-dot1q-bridge:bridge-port": {

        }
      }
    ]
},
"ieee802-dot1ab-lldp:lldp": [
    {
      "lldp-id": "lldp1",
      "message-fast-tx": 100,
      "message-tx-hold-multiplier": 2,
      "message-tx-interval": 30,
      "reinit-delay": 2,
      "tx-credit-max": 5,
      "tx-fast-init": 4,
      "notification-interval": 30,
      "ieee802-dot1q-lldp-tr-tlv:topology-recognition-tlv-extension": {
        "topology-level": 2

See the attached files for a complete setup.

Cheers
Don

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