get_top_entity_from_filter: Could not traverse from filter 'xxx' up to top-entity

[EricMonson]

I'm sorry if this has been answered somewhere. I've tried looking through the forums first and at the YDK documentation. I'm new to YANG/NETCONF, and I'm not sure if what I want to do is invalid, or if it's just the approach that I'm taking is wrong.

I'd like to get a list of all the Xconnects in the device (cisco_ios_xr::Cisco_IOS_XR_l2vpn_cfg::L2vpn::Database::XconnectGroups).

I have the following snippet of code:

NetconfServiceProvider provider{ip_address, "username", "password", 830};

try
{
  auto filter = make_shared<L2vpn::Database::XconnectGroups>();
  CrudService crud_service{};
  auto db_read = crud_service.read( provider, *filter );
}
...

With that, I see the following request go out to the device:

<rpc xmlns="urn:ietf:params:xml:ns:netconf:base:1.0"><get xmlns="urn:ietf:params:xml:ns:netconf:base:1.0">
  <filter><l2vpn xmlns="http://cisco.com/ns/yang/Cisco-IOS-XR-l2vpn-cfg">
  <database>
    <xconnect-groups/>
  </database>
</l2vpn>
</filter>
</get>
</rpc>

This is what I see coming back from the device:

<?xml version="1.0"?>
<rpc-reply xmlns="urn:ietf:params:xml:ns:netconf:base:1.0" message-id="1">
  <data>
    <l2vpn xmlns="http://cisco.com/ns/yang/Cisco-IOS-XR-l2vpn-cfg">
      <database>
        <xconnect-groups>
          <xconnect-group>
            <name>xcon0</name>
            <p2p-xconnects>
              <p2p-xconnect>
                <name>xc0</name>
                <attachment-circuits>
                  <attachment-circuit>
                    <name>GigabitEthernet0/0/0/22.1</name>
                    <enable/>
                  </attachment-circuit>
                </attachment-circuits>
                <pseudowires>
                  <pseudowire>
                    <pseudowire-id>10</pseudowire-id>
                    <neighbor>
                      <neighbor>10.40.10.10</neighbor>
                      <class>path0</class>
                    </neighbor>
                  </pseudowire>
                </pseudowires>
              </p2p-xconnect>
            </p2p-xconnects>
          </xconnect-group>
        </xconnect-groups>
      </database>
    </l2vpn>
  </data>
</rpc-reply>

So it appears that the device accepted the request and responded. However, I get the following error message out of the ydk-cpp libraries:

[ydk] [error] get_top_entity_from_filter: Could not traverse from filter 'xconnect-groups' up to top-entity

From playing around with my query, it appears that the following request doesn't create an error (getting everything under L2vpn):

NetconfServiceProvider provider{ip_address, "username", "password", 830};

try
{
  auto filter = make_shared<L2vpn>();
  CrudService crud_service{};
  auto db_read = crud_service.read( provider, *filter );
}
...

However, I'm curious how to get just the values under XConnectGroups

I'm sure I'm just not forming the right query. Any help would greatly be appreciated.

Thanks,

Eric

[EricMonson]

I finally figured it out. Sorry to keep spamming this forum.

NetconfServiceProvider provider{ip_address, "username", "password", 830};

try
{
  auto filter = make_shared<L2vpn>();
  CrudService crud_service{};
  auto read_value = crud_service.read( provider, *filter->database->xconnect_groups );
}
...