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Install python dependencies

python -m pip install grpcio
python -m pip install protobuf

Download .proto file

https://github.com/nleiva/xrgrpc/blob/v0.6.0/proto/ems/ems_grpc.proto

Create stubs

python -m grpc_tools.protoc --proto_path=. ./iosxr.proto --python_out=. --grpc_python_out=.

Router config

RP/0/RP0/CPU0:Headend#show run formal grpc
grpc port 57344
grpc no-tls
grpc 
grpc address-family ipv4
grpc service-layer

Sample script results

(myvenv310) vlisjak@vlisjak:~/mygrpc$ python ./sr_traceroute.py 
{'hop-index': '0', 'hop-origin-ip': '10.10.10.100', 'hop-destination-ip': '10.10.10.110', 'mtu': '1500', 'dsmap-label-stack': {'dsmap-label': [{'label': 140138}]}, 'return-code': 0, 'return-char': ' ', 'duration': 0}
{'hop-index': '1', 'hop-origin-ip': '10.10.10.110', 'hop-destination-ip': '10.10.101.11', 'mtu': '1500', 'dsmap-label-stack': {'dsmap-label': [{'label': 140138}]}, 'return-code': 8, 'return-char': 'L', 'duration': 56}
{'hop-index': '2', 'hop-origin-ip': '10.10.101.11', 'hop-destination-ip': '10.10.112.2', 'mtu': '1500', 'dsmap-label-stack': {'dsmap-label': [{'label': 140138}]}, 'return-code': 8, 'return-char': 'L', 'duration': 56}
{'hop-index': '3', 'hop-origin-ip': '10.10.112.2', 'hop-destination-ip': '10.10.23.3', 'mtu': '1500', 'dsmap-label-stack': {'dsmap-label': [{'label': 140138}]}, 'return-code': 8, 'return-char': 'L', 'duration': 119}
{'hop-index': '4', 'hop-origin-ip': '10.10.23.3', 'hop-destination-ip': '10.10.34.4', 'mtu': '1500', 'dsmap-label-stack': {'dsmap-label': [{'label': 140138}]}, 'return-code': 8, 'return-char': 'L', 'duration': 162}
{'hop-index': '5', 'hop-origin-ip': '10.10.34.4', 'hop-destination-ip': '10.10.45.5', 'mtu': '1500', 'dsmap-label-stack': {'dsmap-label': [{'label': 140138}]}, 'return-code': 8, 'return-char': 'L', 'duration': 212}
{'hop-index': '6', 'hop-origin-ip': '10.10.45.5', 'hop-destination-ip': '10.10.56.6', 'mtu': '1500', 'dsmap-label-stack': {'dsmap-label': [{'label': 140138}]}, 'return-code': 8, 'return-char': 'L', 'duration': 165}
{'hop-index': '7', 'hop-origin-ip': '10.10.56.6', 'hop-destination-ip': '10.10.67.7', 'mtu': '1500', 'dsmap-label-stack': {'dsmap-label': [{'label': 140138}]}, 'return-code': 8, 'return-char': 'L', 'duration': 222}
{'hop-index': '8', 'hop-origin-ip': '10.10.67.7', 'hop-destination-ip': '10.10.78.8', 'mtu': '1500', 'dsmap-label-stack': {'dsmap-label': [{'label': 0}]}, 'return-code': 8, 'return-char': 'L', 'duration': 368}
{'hop-index': '9', 'hop-origin-ip': '10.10.78.8', 'hop-destination-ip': '', 'mtu': '0', 'dsmap-label-stack': '', 'return-code': 4, 'return-char': 'F', 'duration': 521}

Useful GNMIC examples

Get XPATHs from YANG model

https://github.com/openconfig/gnmic/blob/main/docs/cmd/path.md

gnmic path --search --file ./Cisco-IOS-XR-segment-routing-ms-cfg@2019-06-19.yang
/sr/adjacency-sid/interfaces/interface[interface=*]/address-families/address-family[address-family=*]/address-family
/sr/adjacency-sid/interfaces/interface[interface=*]/address-families/address-family[address-family=*]/next-hops/next-hop[ip-addr=*]/ip-addr
/sr/adjacency-sid/interfaces/interface[interface=*]/address-families/address-family[address-family=*]/next-hops/next-hop[ip-addr=*]/l2-adjacency-sid/absolute-sid
/sr/adjacency-sid/interfaces/interface[interface=*]/address-families/address-family[address-family=*]/next-hops/next-hop[ip-addr=*]/l2-adjacency-sid/index-sid
/sr/adjacency-sid/interfaces/interface[interface=*]/address-families/address-family[address-family=*]/next-hops/next-hop[ip-addr=*]/l2-adjacency-sid/sid-type
/sr/adjacency-sid/interfaces/interface[interface=*]/address-families/address-family[address-family=*]/next-hops/next-hop[ip-addr=*]/l2-adjacency-sid/srlb
/sr/adjacency-sid/interfaces/interface[interface=*]/interface
/sr/enable
<snip>

Get JSON payload (config) from YANG path

https://github.com/openconfig/gnmic/blob/main/docs/cmd/generate.md

gnmic --encoding json_ietf generate --file ./Cisco-IOS-XR-segment-routing-ms-cfg@2019-06-19.yang --path /sr/adjacency-sid/interfaces/interface/address-families/address-family --json
[
  {
    "address-family": "",
    "next-hops": {
      "next-hop": [
        {
          "ip-addr": "",
          "l2-adjacency-sid": {
            "absolute-sid": "",
            "index-sid": "",
            "sid-type": "",
            "srlb": ""
          }
        }
      ]
    }
  }
]

Get config diffs

https://github.com/openconfig/gnmic/blob/main/docs/cmd/diff/diff.md

gnmic ```-u cisco -p cisco diff --insecure -t config  --encoding json_ietf --ref clab-mini-p1 --compare clab-mini-p2 --path Cisco-IOS-XR-ip-static-cfg:router-static
"clab-mini-p1" vs "clab-mini-p2"
-       Cisco-IOS-XR-ip-static-cfg:router-static/default-vrf/address-family/vrfipv4/vrf-unicast/vrf-prefixes/vrf-prefix.0/prefix                                                                   : 1.1.1.1
-       Cisco-IOS-XR-ip-static-cfg:router-static/default-vrf/address-family/vrfipv4/vrf-unicast/vrf-prefixes/vrf-prefix.0/prefix-length                                                            : 32
-       Cisco-IOS-XR-ip-static-cfg:router-static/default-vrf/address-family/vrfipv4/vrf-unicast/vrf-prefixes/vrf-prefix.0/vrf-route/vrf-next-hop-table/vrf-next-hop-interface-name.0/interface-name: Null0