How to resolve issue 'sync-too-big'

NETCONF
1

Hi there!

I try to get all operational notifications from netconf. I use for that yang push.
When run ./netconf-console -u xxxxx -p xxxxx netconf-establish-push.xml
Where netconf-establish-push.xml is:

<?xml version="1.0" encoding="UTF-8"?>
<hello xmlns="urn:ietf:params:xml:ns:netconf:base:1.0">
  <capabilities>
    <capability>urn:ietf:params:netconf:base:1.0</capability>
  </capabilities>
</hello>

<?xml version="1.0" encoding="UTF-8"?>
<rpc message-id="101" xmlns="urn:ietf:params:xml:ns:netconf:base:1.0">
    <establish-subscription xmlns="urn:ietf:params:xml:ns:yang:ietf-subscribed-notifications" xmlns:yp="urn:ietf:params:xml:ns:yang:ietf-yang-push">
        <yp:datastore xmlns:ds="urn:ietf:params:xml:ns:yang:ietf-datastores">
            ds:operational
        </yp:datastore>
        <yp:on-change>
            <yp:dampening-period>100</yp:dampening-period>
        </yp:on-change>
    </establish-subscription>
</rpc>

<?xml version="1.0" encoding="UTF-8"?>
<rpc xmlns="urn:ietf:params:xml:ns:netconf:base:1.0" message-id="2">
  <close-session/>

Log confD:
confd[16]: audit user: admin/0 external authentication succeeded via netconf from 172.17.0.1:42412 with ssh, member of groups:
confd[16]: audit user: admin/0 logged in via netconf from 172.17.0.1:42412 with ssh using external authentication
confd[16]: audit user: admin/265 assigned to groups:
confd[16]: audit user: admin/265 created new session via netconf from 172.17.0.1:42412 with ssh
confd[16]: netconf id=265 new ssh session for user “admin” from 172.17.0.1
confd[16]: netconf id=265 got rpc: {urn:ietf:params:xml:ns:yang:ietf-subscribed-notifications}establish-subscription attrs: message-id=“101”
confd[16]: netconf id=265 establish-subscription target={datastore,operational} attrs: message-id=“101”
confd[16]: netconf id=265 sending rpc-reply, attrs: message-id=“101”
confd[16]: netconf id=265 close-session attrs: message-id=“2”
confd[16]: audit user: admin/265 terminated session (reason: normal)
confd[16]: netconf id=265 sending rpc-reply, attrs: message-id=“2”
confd[16]: audit user: admin/0 logged out user

Result response is:

<?xml version="1.0" encoding="UTF-8"?>
<rpc-reply xmlns="urn:ietf:params:xml:ns:netconf:base:1.0" message-id="101">
  <rpc-error>
    <error-type>application</error-type>
    <error-tag>operation-failed</error-tag>
    <error-severity>error</error-severity>
    <error-info>
      <establish-subscription-datastore-error-info xmlns="urn:ietf:params:xml:ns:yang:ietf-yang-push">
        <reason>sync-too-big</reason>
      </establish-subscription-datastore-error-info>
    </error-info>
  </rpc-error>
</rpc-reply>

What can I change to correct working?
How can I set name of stream for notifications?

Kind regards,
Denys

3

The sync-too-big error reason seems to be returned if you do not provide a filter. I.e. a datastore-xpath-filter. ConfD will not monitor whole datastore.

From the examples.confd/netconf_yang_push/on-change-subscription.xml example:

<establish-subscription
  xmlns="urn:ietf:params:xml:ns:yang:ietf-subscribed-notifications"
  xmlns:yp="urn:ietf:params:xml:ns:yang:ietf-yang-push">
  <yp:datastore
    xmlns:ds="urn:ietf:params:xml:ns:yang:ietf-datastores">
    ds:operational
  </yp:datastore>
  <yp:datastore-xpath-filter
    xmlns:if="urn:ietf:params:xml:ns:yang:ietf-interfaces">
    /if:interfaces
  </yp:datastore-xpath-filter>
  <yp:on-change>
    <yp:dampening-period>0</yp:dampening-period>
    <yp:sync-on-start>true</yp:sync-on-start>
  </yp:on-change>
</establish-subscription>