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While I was working on #1546 (closed) I was writing forge tests, for each scenario I wanted to have example for option 43 and option 125. And we have weird problem with including suboptions to option 125.

If option is defined with vendor- prefix in space name, it will be included. If prefix vendor- is missing suboption wont be included:

working configuration:

        "client-classes": [
            {
                "name": "VENDOR_CLASS_41112", 
                "option-data": [
                    {
                        "data": "41112", 
                        "name": "vivso-suboptions"
                    }, 
                    {
                        "always-send": true, 
                        "data": "11.11.11.11", 
                        "name": "unifi-address", 
                        "space": "vendor-41112"
                    }
                ]
            }
        ],
        "option-def": [
            {
                "array": false, 
                "code": 1, 
                "encapsulate": "", 
                "name": "unifi-address", 
                "record-types": "", 
                "space": "vendor-41112", 
                "type": "ipv4-address"
            }
        ],

but If I remove vendor- or change it to anything else e.g. abc defined suboption won't be send.

Exactly opposite situation is with suboptions of option 43 working configuration:

        "client-classes": [
            {
                "name": "VENDOR_CLASS_339", 
                "option-data": [
                    {
                        "name": "vendor-encapsulated-options"
                    }, 
                    {
                        "always-send": true, 
                        "data": "123", 
                        "name": "vlanid", 
                        "space": "339"
                    }, 
                    {
                        "always-send": true, 
                        "data": "sdlp://11.11.11.11:18443", 
                        "name": "dls", 
                        "space": "339"
                    }
                ], 
                "option-def": [
                    {
                        "code": 43, 
                        "encapsulate": "339", 
                        "name": "vendor-encapsulated-options", 
                        "type": "empty"
                    }
                ]
            }
        ], 
        "option-def": [
            {
                "array": false, 
                "code": 2, 
                "encapsulate": "", 
                "name": "vlanid", 
                "record-types": "", 
                "space": "339", 
                "type": "uint32"
            }, 
            {
                "array": false, 
                "code": 3, 
                "encapsulate": "", 
                "name": "dls", 
                "record-types": "", 
                "space": "339", 
                "type": "string"
            }
        ],

If options would be configured with "space": "vendor-339" those would not be included in response.

I couldn't find statement in documentation when this prefix required, and looks like ppl on user mailing list also didn't. Easy solution would be to update ARM, but I would prefer to make configuration of those options consistnat.