topic Re: deref() doesn't work in NSO Developer Hub Discussions

deref() doesn't work

prmalik — Fri, 07 Dec 2018 00:39:46 GMT

Hi Team,

I have below error with the deref(). I also looked at Xpath and some old discussions but not able to figure out the issue.

leaf sitename-existing {

tailf:info "Unique Existing Site Name";

description "This leaf for existing sitename. This is needed to pull site UUID ";

type leafref {

path "deref(../../device)/../ncs:config/vts-service:vts-service/vts-service:sites/vts-service:site/vts-service:id";

}

Error :

vtsInstance-site-router.yang:41: error: vtsInstance-site-router:device in the path for sitename-existing at vtsInstance-site-router.yang:37 is not found

Below are details (Xpath for reference)

/devices/device[name='MPN-DEV0']/config/vts-service:vts-service/sites/site[id='be416d94-a2c2-41a4-b186-aec1739413ff']/name SITE3

Can you pls help me to understand what's wrong here ?

Re: deref() doesn't work

hniska — Fri, 07 Dec 2018 08:45:53 GMT

As the error message says, in your YANG module vtsInstance-site-router, two steps up from the deref(), no leaf named device can be found. So check the path, to many, to few ../ ?

Re: deref() doesn't work

prmalik — Sun, 09 Dec 2018 17:11:59 GMT

Hi Hakan,

Thanks for your reply. I tried all combinations, after fixing device, I get below error :

error: vts-service:vts-service in the path for sitename-existing at vtsInstance-site-router.yang:45 is not found

for testing, I have configured as following :

(Below path is not working)

path "/ncs:devices/ncs:device[ncs:name=current()/../device]/ncs:config/vts-service:vts-service/vts-service:sites/vts-service:site/vts-service:id";

I have similar path working fine for XR (below path is working fine)

path "/ncs:devices/ncs:device[ncs:name=current()/../../device]/ncs:config/cisco-ios-xr:interface/cisco-ios-xr:GigabitEthernet/cisco-ios-xr:id";

I am still not sure issue with the vts-service as I see below xpath on NSO

admin@ncs# show running-config devices device MPN-DEV0 config | display xpath
/devices/device[name='MPN-DEV0']/config/vts-service:vts-service/sites/site[id='be416d94-a2c2-41a4-b186-aec1739413ff']/name SITE3

Do you know why its complaining about vts-service ? or something I have still wrong in the path ?

Re: deref() doesn't work

prmalik — Wed, 12 Dec 2018 01:38:55 GMT

This has been solved. Pyang was reporting error but there was no issue with the compilation.

Thanks !!!