Event-Applet-Netconf

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Event Applet

Resources Summary

YANG Path	get/get-config	edit-config	rpc
/event-applets/{name}	Y	merge, replace, create, delete	—
/event-applets/{name}/actions/{priority}	Y	merge, replace, create, delete	—
/event-applets/{name}/trigger	Y	merge, replace, create, delete	—

Examples

This chapter provides examples on how to use Netconf to manage Event Applet configurations on AsterNOS devices.

NOTE

Event Applets allow you to define automated responses to system events. Each applet consists of a trigger (monitored interfaces that fire the applet when they go down) and a set of actions (CLI commands to execute when triggered).

Currently supported trigger type: interface-down (intf-down). Currently supported action type: CLI command execution (klish).

For detailed YANG definitions, please refer to yang/asternos-event-applet.yang.

Create Event Applet with Interface-Down Trigger and CLI Actions

This example creates a complete event applet that monitors Ethernet interfaces and automatically executes CLI commands when any of them goes down.

<config>
  <top>
    <event-applets xmlns="http://asterfusion.com/ns/yang/asternos-event-applet"
                   operation="create">
      <event-applet>
        <name>link-down-recovery</name>
        <warning>true</warning>
        <trigger>
          <event-type>intf-down</event-type>
          <interfaces>Ethernet1</interfaces>
          <interfaces>Ethernet2</interfaces>
        </trigger>
        <actions>
          <action>
            <priority>0</priority>
            <action-type>klish</action-type>
            <command>interface ethernet 5</command>
          </action>
          <action>
            <priority>1</priority>
            <action-type>klish</action-type>
            <command>shutdown</command>
          </action>
          <action>
            <priority>2</priority>
            <action-type>klish</action-type>
            <command>no shutdown</command>
          </action>
        </actions>
      </event-applet>
    </event-applets>
  </top>
</config>

Response example

<rpc-reply xmlns="urn:ietf:params:xml:ns:netconf:base:1.0"
           message-id="urn:uuid:f20f182e-f568-49d0-ad82-aaac24244f74">
  <ok/>
</rpc-reply>

Create Event Applet with Trigger Only (No Actions)

You can create an applet without actions and add them later.

<config>
  <top>
    <event-applets xmlns="http://asterfusion.com/ns/yang/asternos-event-applet"
                   operation="create">
      <event-applet>
        <name>port-down-monitor</name>
        <warning>false</warning>
        <trigger>
          <event-type>intf-down</event-type>
          <interfaces>PortChannel0001</interfaces>
        </trigger>
      </event-applet>
    </event-applets>
  </top>
</config>

Response example

<rpc-reply xmlns="urn:ietf:params:xml:ns:netconf:base:1.0">
  <ok/>
</rpc-reply>

Add Actions to an Existing Event Applet

Add one or more actions to an applet that was previously created without actions.

<config>
  <top>
    <event-applets xmlns="http://asterfusion.com/ns/yang/asternos-event-applet">
      <event-applet>
        <name>port-down-monitor</name>
        <actions operation="create">
          <action>
            <priority>0</priority>
            <action-type>klish</action-type>
              <command>interface ethernet 5</command>
          </action>
          <action>
            <priority>0.5</priority>
            <action-type>klish</action-type>
              <command>shutdown</command>
          </action>
        </actions>
      </event-applet>
    </event-applets>
  </top>
</config>

Response example

<rpc-reply xmlns="urn:ietf:params:xml:ns:netconf:base:1.0">
  <ok/>
</rpc-reply>

Merge (Modify) an Action

Replace the command of an existing action using the merge operation.

<config>
  <top>
    <event-applets xmlns="http://asterfusion.com/ns/yang/asternos-event-applet">
      <event-applet>
        <name>port-down-monitor</name>
        <actions operation="replace">
          <action>
            <priority>0</priority>
              <command>show interface counters errors</command>
          </action>
        </actions>
      </event-applet>
    </event-applets>
  </top>
</config>

Response example

<rpc-reply xmlns="urn:ietf:params:xml:ns:netconf:base:1.0">
  <ok/>
</rpc-reply>

Delete an Action from an Event Applet

Remove a specific action by its priority key.

<config>
  <top>
    <event-applets xmlns="http://asterfusion.com/ns/yang/asternos-event-applet">
      <event-applet>
        <name>port-down-monitor</name>
        <actions>
          <action operation="delete">
            <priority>0</priority>
          </action>
        </actions>
      </event-applet>
    </event-applets>
  </top>
</config>

Response example

<rpc-reply xmlns="urn:ietf:params:xml:ns:netconf:base:1.0">
  <ok/>
</rpc-reply>

Delete an Event Applet

Remove event applets and all its associated actions and trigger bindings.

<config>
  <top>
    <event-applets xmlns="http://asterfusion.com/ns/yang/asternos-event-applet"
                   operation="delete">
      <event-applet>
        <name>port-down-monitor</name>
      </event-applet>
    </event-applets>
  </top>
</config>

Response example

<rpc-reply xmlns="urn:ietf:params:xml:ns:netconf:base:1.0">
  <ok/>
</rpc-reply>

Bind Interfaces to an Existing Trigger

Add interfaces to an existing applet’s trigger monitoring list.

<config>
  <top>
    <event-applets xmlns="http://asterfusion.com/ns/yang/asternos-event-applet">
      <event-applet>
        <name>link-down-recovery</name>
        <trigger operation="merge">
            <interfaces>Ethernet3</interfaces>
            <interfaces>PortChannel0002</interfaces>
        </trigger>
      </event-applet>
    </event-applets>
  </top>
</config>

Response example

<rpc-reply xmlns="urn:ietf:params:xml:ns:netconf:base:1.0">
  <ok/>
</rpc-reply>

Unbind Interfaces from a Trigger

Remove specific interfaces from the trigger monitoring list.

<config>
    <top>
      <event-applets xmlns="http://asterfusion.com/ns/yang/asternos-event-applet">
        <event-applet>
          <name>link-down-recovery</name>
          <trigger>
              <interfaces operation="delete">Ethernet1</interfaces>
          </trigger>
        </event-applet>
      </event-applets>
    </top>
  </config>

Response example

<rpc-reply xmlns="urn:ietf:params:xml:ns:netconf:base:1.0">
  <ok/>
</rpc-reply>

Enable / Disable Warning Logging

Toggle the warning flag to control whether a syslog message is emitted when the applet is triggered.

Enable warning:

<config>
  <top>
    <event-applets xmlns="http://asterfusion.com/ns/yang/asternos-event-applet">
      <event-applet operation="merge">
        <name>link-down-recovery</name>
        <warning>true</warning>
      </event-applet>
    </event-applets>
  </top>
</config>

Disable warning:

<config>
  <top>
    <event-applets xmlns="http://asterfusion.com/ns/yang/asternos-event-applet">
      <event-applet operation="merge">
        <name>link-down-recovery</name>
        <warning>false</warning>
      </event-applet>
    </event-applets>
  </top>
</config>

Get All Event Applets

Retrieve the full configuration of all event applets via get-config.

<filter type="subtree">
  <top>
    <event-applets/>
  </top>
</filter>

Response example

<rpc-reply xmlns="urn:ietf:params:xml:ns:netconf:base:1.0" message-id="1">
  <data xmlns="urn:ietf:params:xml:ns:netconf:base:1.0">
    <top>
      <event-applets xmlns="http://asterfusion.com/ns/yang/asternos-event-applet">
        <event-applet>
          <name>link-down-recovery</name>
          <warning>true</warning>
          <trigger>
              <event-type>intf-down</event-type>
              <interfaces>Ethernet1</interfaces>
              <interfaces>Ethernet2</interfaces>
              <interfaces>Ethernet3</interfaces>
              <interfaces>PortChannel0002</interfaces>
          </trigger>
          <actions>
            <action>
              <priority>0</priority>
                <action-type>klish</action-type>
                <command>interface ethernet 5</command>
            </action>
            <action>
              <priority>1</priority>
                <action-type>klish</action-type>
                <command>shutdown</command>
            </action>
            <action>
              <priority>2</priority>
                <action-type>klish</action-type>
                <command>no shutdown</command>
            </action>
          </actions>
        </event-applet>
        <event-applet>
          <name>port-down-monitor</name>
          <warning>false</warning>
          <trigger>
              <event-type>intf-down</event-type>
              <interfaces>PortChannel0001</interfaces>
          </trigger>
          <actions>
            <action>
              <priority>0</priority>
                <action-type>klish</action-type>
                <command>show interface counters errors</command>
            </action>
          </actions>
        </event-applet>

      </event-applets>
    </top>
  </data>
</rpc-reply>

Get a Specific Event Applet

Retrieve configuration of a single event applet by name.

<filter type="subtree">
  <top>
    <event-applets>
      <event-applet>
        <name>link-down-recovery</name>
      </event-applet>
    </event-applets>
  </top>
</filter>

Response example

<rpc-reply xmlns="urn:ietf:params:xml:ns:netconf:base:1.0" message-id="2">
  <data xmlns="urn:ietf:params:xml:ns:netconf:base:1.0">
    <top>
      <event-applets xmlns="http://asterfusion.com/ns/yang/asternos-event-applet">
        <event-applet>
          <name>link-down-recovery</name>
          <warning>true</warning>
          <trigger>
              <event-type>intf-down</event-type>
              <interfaces>Ethernet1</interfaces>
              <interfaces>Ethernet2</interfaces>
              <interfaces>Ethernet3</interfaces>
              <interfaces>PortChannel0002</interfaces>
          </trigger>
          <actions>
            <action>
              <priority>0</priority>
                <action-type>klish</action-type>
                <command>interface ethernet 5</command>
            </action>
            <action>
              <priority>1</priority>
                <action-type>klish</action-type>
                <command>shutdown</command>
            </action>
            <action>
              <priority>2</priority>
                <action-type>klish</action-type>
                <command>no shutdown</command>
            </action>
          </actions>
        </event-applet>
      </event-applets>
    </top>
  </data>
</rpc-reply>

Complete Workflow: Link-Down Auto-Recovery

This end-to-end example demonstrates a practical use case: automatically attempting to recover a failing link by cycling the interface state.

Step 1: Create an applet with multi-step recovery actions.

<config>
  <top>
    <event-applets xmlns="http://asterfusion.com/ns/yang/asternos-event-applet"
                   operation="create">
      <event-applet>
        <name>auto-recovery</name>
        <warning>true</warning>
        <trigger>
            <event-type>intf-down</event-type>
            <interfaces>Ethernet5</interfaces>
            <interfaces>Ethernet6</interfaces>
        </trigger>
        <actions>
          <action>
            <priority>0</priority>
              <action-type>klish</action-type>
              <command>show interface status</command>
          </action>
          <action>
            <priority>1</priority>
              <action-type>klish</action-type>
              <command>interface ethernet 5</command>
          </action>
          <action>
            <priority>2</priority>
              <action-type>klish</action-type>
              <command>shutdown</command>
          </action>
          <action>
            <priority>3</priority>
              <action-type>klish</action-type>
              <command>no shutdown</command>
          </action>
        </actions>
      </event-applet>
    </event-applets>
  </top>
</config>

Step 2: Verify the configuration was applied.

<get-config>
  <source><running/></source>
  <filter type="subtree">
    <top>
      <event-applets>
        <event-applet>
          <name>auto-recovery</name>
        </event-applet>
      </event-applets>
    </top>
  </filter>
</get-config>

Step 3: Later, if Ethernet5/6 goes down, the applet fires automatically:

Logs the last 20 system messages for diagnostics
Enters interface context for Ethernet5
Administratively shuts down the interface
Brings it back up (link flap recovery)

Step 4: After maintenance, remove the applet when no longer needed.

<config>
  <top>
    <event-applets xmlns="http://asterfusion.com/ns/yang/asternos-event-applet"
                   operation="delete">
      <event-applet>
        <name>auto-recovery</name>
      </event-applet>
    </event-applets>
  </top>
</config>

Properties Descriptions

event applet configuration

Tree Diagram

module: asternos-event-applet
  +--rw event-applets
     +--rw event-applet* [name]
        +--rw name       string
        +--rw trigger
        |  +--rw event-type          identityref
        |  +--rw (event-params)?
        |     +--:(intf-down)
        |        +--rw interfaces*   union
        +--rw actions
        |  +--rw action* [priority]
        |     +--rw priority         string
        |     +--rw action-type      identityref
        |     +--rw (payload)?
        |        +--:(klish)
        |           +--rw command    string
        +--rw warning?   boolean

Table of Properties

Name	Required	Type/Range	Description
event-applets	M		Path-only node, has no configurable value. event applet configuration.
event-applet	M		Path-only node, has no configurable value.
name	O	None
trigger	M		Path-only node, has no configurable value. The event that fires this applet. Exactly one trigger per applet.
event-type	M	”intf-down”	Which kind of event fires this applet. New event sources are added by defining a new identity based on event-type.
interfaces	O	Ethernet name	Interfaces monitored by this trigger. Accepts either an Ethernet port or a port-channel.
actions	M		Path-only node, has no configurable value. Ordered set of actions executed when the applet fires. Actions run in ascending priority order; within the same priority the order is unspecified.
action	M		Path-only node, has no configurable value. A single action bound to this applet. Its payload format is selected by action-type.
priority	O	None	Execution order key, range 0-9999.9999. The smaller the value the earlier the action runs.
action-type	M	”klish”	Which execution format payload carries. New formats are added by defining a new identity based on action-type.
command	M	string (length 1..4096)	klish CLI command to execute, e.g. ‘shutdown’ or ‘show interface counters’.
warning	O	”true" "false”	print warning to syslog when applet is triggered.

Action

Tree Diagram

module: asternos-event-applet
  +--rw event-applets

Trigger

Tree Diagram

module: asternos-event-applet
  +--rw event-applets