CDB Subscribe : Subscription path format

CDB and CDB API
1

Hi,

We are using ietf interface yang file and each interface has type attribute .

We want to subscribe for changes only related to specific type.

container interfaces
{
list interface
{
key “name”

leaf name
{
type string;
}

leaf type {
type identityref {
base interface-type;
}
}
}

Could you please help to know how we can achieve this subscription?

Below format doesn’t seems to be valid.

cdb_subscribe(subsock, 0, if__ns, &spoint,“/interfaces/interface[type=ethSubInterface]”))

Regards,
ramishet

2

cdb_subscribe(subsock, 0, if__ns, &spoint,"/interfaces/interface/type")) should do it.

See section 5.6. CDB subscriptions in the UG explains this further, specifically this part:

/named/options/pid-file
a subscription to a leaf. Only changes to this leaf will generate a notification.

/servers
Means that we subscribe to any changes in the subtree rooted at /servers. This includes additions or removals of server instances, as well as changes to already existing server instances.

/servers/server{www}/ip
Means that we only want to be notified when the server "www" changes its ip address.

/servers/server/ip
Means we want to be notified when the leaf ip is changed in any server instance.
3

Thanks for the reply. Sorry, the need for the subscription is as below

1.The interfaces can be of two types, “Type1” interface and “Type2” interface. Type is a attribute in the interface
2.The application wants to subscribe for the creation of the interface which is of “Type1” only

Regards,
Ramishet

4

You can not do that with cdb_subscribe() but see cdb_diff_iterate() and cdb_diff_match() for ways of filtering subscription notifications to extract relevant configuration changes.

5

Thank you. We shall use this approach instead.