Before doing all that I completed Cisco's DevNet "NETCONF/YANG on Nexus" lab parts 1, 2 and 3. Part 3 of the lab uses OpenConfig YANG models, so you can skip part 2 entirely. XML in Cisco's script looked simple enough, but it took me few short days of reading RFCs and data models, trials, errors and reading data models again to come up with YAML file that pyang finally validated and converted into XML. Here is what I got:
You can see XML file that pyang generated here. Pyang writes everything in one line, so I edited it for readability. I used another script to push resulted XML to virtual Nexus switch. And it did not work. The error message said that namespace was empty. (Since Cisco gives access to NX-OS sandbox only for one hour, I had to setup my own sandbox. I'll write another post about it). Another few short hours and manual XML editing - nobody should be editing XML manually - I came up with something that my virtual Nexus accepted (github).--- "openconfig-interfaces:interfaces": interface: - name: eth1/1 config: name: eth1/1 type: ethernetCsmacd subinterfaces: subinterface: - index: 0 openconfig-if-ip:ipv4: addresses: address: - ip: 172.16.1.0 config: ip: 172.16.1.0 prefix-length: 31
But I had to add "no switchport" command to Eth1/1 manually first. I could not find anything in OpenConfig or IETF models to make switch do it.<config> <interfaces xmlns="http://openconfig.net/yang/interfaces"> <interface> <name>eth1/1</name> <config> <name>eth1/1</name> <description>OpenConfig</description> <type>ianaift:ethernetCsmacd</type> </config> <subinterfaces> <subinterface> <index>0</index> <ipv4> <addresses> <address> <ip>172.16.1.0</ip> <config> <ip>172.16.1.0</ip> <prefix-length>31</prefix-length> </config> </address> </addresses> </ipv4> </subinterface> </subinterfaces> </interface> </interfaces> </config>
Now is time to save my hard-won changes to startup config - see commented line 29 in the script. It's commented, because virtual switch complained that "startup" is incorrect datastore, while RFC6241 says otherwise. It became clear why switch and RFC disagreed after I looked at switch's NETCONF capabilities:
Capability ":startup" is missing. So, no way to save configuration via NETCONF, I guess.
I am going to check the extent of OpenConfig support on Juniper and Arista devices and for now implement 1st step of my plan - convert totally bogus data structure into OpenConfig-compliant one