YANG , Telemetry sensor path

Question

i am using this module " Cisco-IOS-XR-pfi-im-cmd-oper.yang" to get interface counts (UP , Down , Admin-Down), but i am stuck with symbol *[] , i dont understand what to put inside if there is no keys inside list brackets ,

 +--ro node-type-sets
 |  +--ro node-type-set* []
 |     +--ro node-name?           xr:Node-id
 |     +--ro type-set-name?       Interface-type-set
 |     +--ro interface-summary
 |        +--ro interface-counts
 |        |  +--ro interface-count?              uint32
 |        |  +--ro up-interface-count?           uint32
 |        |  +--ro down-interface-count?         uint32
 |        |  +--ro admin-down-interface-count?   uint32
 |        +--ro interface-type* []
 |           +--ro interface-counts
 |           |  +--ro interface-count?              uint32
 |           |  +--ro up-interface-count?           uint32
 |           |  +--ro down-interface-count?         uint32
 |           |  +--ro admin-down-interface-count?   uint32
 |           +--ro interface-type-name?          string
 |           +--ro interface-type-description?   string

i figure out this path below , but it still keep tell me is worng

Cisco-IOS-XR-pfi-im-cmd-oper:interfaces/node-type-sets/node-type-set[type-set-name='hardware-interfaces',node-name='0/RP0/CPU0']/interface-summary/interface-type[interface-type-name='IFT_GETHERNET',interface-type-description='GigabitEthernet']/interface-counts

i want to get "interface-counts" when the :

type-set-name='hardware-interfaces' 
node-name='0/RP0/CPU0' 
interface-type-name='IFT_GETHERNET' 
interface-type-description='GigabitEthernet'

all these info to get specific interface counts for this module

Please edit your question to include the actual query you are trying to perform, or provide more context, so it is evident what you are trying to accomplish. — predi, Jun 09 '23 at 10:43
It is still unclear how you are requesting this data from the server. Are you performing a NETCONF `get`/`get-data` operation with a subtree/XPath filter? Or is this something else entirely? — predi, Jun 10 '23 at 07:10
I am using MDT telemetry , this path is the filter path inside the XR CISCO device configuration , this path came from YANG model called "Cisco-IOS-XR-pfi-im-cmd-oper.yang" , it is similar to Netconf or it is based on it , thanks — Mustafa Hussien, Jun 11 '23 at 06:37

predi · Answer 1 · 2023-06-09T06:19:21.917

It is unclear what context your path is used in, but I'm assuming you need an instance identifier.

If you need to uniquely identify an instance that is a list without keys or has list ancestors without keys (config false data nodes), you need to follow RFC 7950, Section 9.13..

The syntax for an instance-identifier is a subset of the XPath abbreviated syntax, formally defined by the rule "instance-identifier" in Section 14. It is used to uniquely identify a node in the data tree. Predicates are used only for specifying the values for the key nodes for list entries, a value of a leaf-list entry, or a positional index for a list without keys. For identifying list entries with keys, each predicate consists of one equality test per key, and each key MUST have a corresponding predicate. If a key is of type "empty", it is represented as a zero-length string ("").

There's an example in Section 9.13.4:

     /* instance-identifier for a list entry without keys */
     /ex:stats/ex:port[3]

i want to get "interface-counts" when the : type-set-name='hardware-interfaces' node-name='0/RP0/CPU0' interface-type-name='IFT_GETHERNET' interface-type-description='GigabitEthernet' all these info to get specific interface counts for this module — Mustafa Hussien, Jun 09 '23 at 08:41

YANG , Telemetry sensor path

1 Answers1