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foreach & leaf-list

kuiliu
Cisco Employee
Cisco Employee

Hi Guys,

 

I'm wondering if foreach can be used for leaf-list, I haven't find such an example, has anyone ever used it workable?

 

Thanks

1 Accepted Solution

Accepted Solutions

Thanks so much for clear explaination. It now working with wrap pw-id with string :)

View solution in original post

5 Replies 5

Touseef Gulgundi
Cisco Employee
Cisco Employee

I am able to use the leaf-list items using for each loop. 

 

In the below example my leaf-list type is leaf-ref as I m referring to an other leaf to select only those entires.

 

Ex: 

leaf-list DMZ_Tunnels{
type leafref {
path "../../../Interfaces/Tunnel_Name";
}
}

 

You can refer to it as below in ur python code.

 

for tunnel in DMZ_Tunnels:

    self.log.info(tunnel)

Hi, 
Is it possible to use each element in leaf-list from plain xml template without python-template ?

 

For example
I have yang like this

leaf-list neighbors {
	type inet:ipv4-address;
}

and xml template like this

<vfi>
    <name>{./vfi-name}</name>
    <neighbor>
        <address>{./neighbors}</address>
        <pw-id>{./pw-id}</pw-id>
    </neighbor>
</vfi>

when exeute this service from command line maybe like:
myservice neightbor [ 1.1.1.1 2.2.2.2 ]
How to use this neighbors variable in xml template ?

Yes.

 

Assuming here that pw-id is the same for all neighbors, your template should look something like this:

 

 

                <vfi>
                  <name>{/vfi-name}</name>
                  <neighbor>
                    <address>{/neighbors}</address>
                    <pw-id>{string(/pw-id)}</pw-id>
                  </neighbor>
                </vfi>

 

admin@ncs(config-foo-bar)# commit dry-run outformat native
native {
    device {
        name xr-00
        data l2vpn
              bridge group 12
               bridge-domain 23
                vfi ttt
                 neighbor 1.1.1.1 pw-id 4444
                 exit
                 neighbor 2.2.2.2 pw-id 4444
                 exit
                exit
               exit
              exit
             exit
    }
}

 

I assumed that everything is directly under the service so I didn't add the dots you've added, but depending on the context you'd have, you might need to change that.

 

 

But anyhow, the context in a service XML template is a bit tricky, but the bottom line is that if you have some properties taken from a list or leaf-list in your service model, and you assign those to another list in your device model, and you also need to fetch inputs from outside the source list (in this example, pw-id), you'd usually wrap those (and only those) in the xpath string() method, as it doesn't affect the context.

 

You can usually use 'commit dry-run | debug template' to track the context, but in the case of a leaf-list it won't be as helpful as in the case of a proper list - but still something to keep in mind...

Thanks so much for clear explaination. It now working with wrap pw-id with string :)

Hi,

what if pw-id needs to be different, it is not a valid for this case. but with ipaddress and subnet configuration


<secondary>
<address>12.1.1.1</address>
<netmask>255.255.255.128</netmask>
</secondary>
<secondary>
<address>13.1.1.1</address>
<netmask>255.255.255.0</netmask>
</secondary>


Tried with list
list test {
key "secondary-ip-address";
leaf secondary-ip-address {
type inet:ipv4-address;
}
leaf secondary-netmask {
type inet:ipv4-address;
}
}


also with leaf-list something like this


leaf-list secondary-ip-address {
type inet:ipv4-address;
}
leaf-list secondary-netmask {
type inet:ipv4-address;
}


but getting this error
_ncs.error.Error: Unknown error (66): leaf-list-test-template.xml:24 Expression '{/test/secondary-netmask}' resulted in an incompatible value '255.255.255.0255.255.255.128' for /ncs:devices/device{ar19.BLB}/config/ifmgr-cfg:interface-con
figurations/interface-configuration{act TenGigE0/0/0/30}/ipv4-io-cfg:ipv4-network/addresses/secondaries/secondary{12.1.1.1}/netmask

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