# Using must to cross validate CLI

**URL:** <https://dmap-community.ductus.global/t/using-must-to-cross-validate-cli/1912>\
**Category:** YANG\
**Created:** [May 2, 2018, 6:39pm UTC](https://dmap-community.ductus.global/t/using-must-to-cross-validate-cli/1912 "2018-05-02T18:39:33Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![dkulkarni](https://avatars.discourse-cdn.com/v4/letter/d/3bc359/32.png) [@dkulkarni](https://dmap-community.ductus.global/u/dkulkarni)\
**Post date:** [May 2, 2018, 6:39pm UTC](https://dmap-community.ductus.global/t/using-must-to-cross-validate-cli/1912/1 "2018-05-02T18:39:33Z")

</div>

Hi,  
my CLI looks like -

```
router lisp
site site123
   eid-prefix instance-id 100 1.1.1.0/24 accept-more-specifics 
   eid-prefix instance-id 102 2.2.2.0/24 accept-more-specifics 
   eid-prefix instance-id 103 3.3.3.0/24 accept-more-specifics 
site site345
   eid-prefix instance-id 104 4.4.1.0/24 accept-more-specifics 
   eid-prefix instance-id 106 6.6.2.0/24 accept-more-specifics 
extranet ext1
   eid-record-provider instance-id 103

```

I need a must statement for CLI “eid-record-provider” which validates if the instance-id being used there is defined under “site”.

I have written something like -

```
     tailf:cli-diff-dependency "../../../../site/eid-prefix/instance-id/id";
     must "../../../../site[name = current()]/eid-prefix/instance-id[id = current()]" {
       error-message "% Please configure site before provider instance";   
     }  

```

I am not sure how i am going to iterate must for all sites?

Thanks

---

<div class="post-metadata">

**Author:** ![dkulkarni](https://avatars.discourse-cdn.com/v4/letter/d/3bc359/32.png) [@dkulkarni](https://dmap-community.ductus.global/u/dkulkarni)\
**Post date:** [May 3, 2018, 5:31am UTC](https://dmap-community.ductus.global/t/using-must-to-cross-validate-cli/1912/2 "2018-05-03T05:31:19Z")

</div>

Any pointers please on the “must” statement usage.