🧪 Lab 01 · Enabling gNMI & OpenConfig YANG Data Models¶

✅ Validated on Arista cEOS 4.32.0F. All outputs captured live from fabric in OrbStack.

Time: ~40 minutes · Nodes: 4 (2 Spines, 2 Leafs)

Quick Start — Step-by-Step Execution Guide (Location: labs/telemetry-lab/)

Step 1 · Deploy the Lab Fabric (if not already running)

cd labs/telemetry-lab
sudo containerlab deploy -t topology.clab.yml --max-workers 1

Step 2 · Launch the Fully Guided Interactive Walkthrough

./run.sh --guided

Alternative Execution Options (Automated Push or Manual CLI)

Fast Automated Script Push:

./run.sh 01          # apply + verify step 01 automatically
./run.sh --all       # run all steps in order

Manual Line-by-Line CLI Execution: Interactive CLI shell on any container node:
```
docker exec -it clab-telemetry-lab-leaf1 Cli
```

🧠 Technology Deep Dive: gNMI & OpenConfig YANG Architecture¶

1. What is gNMI?¶

gNMI (gRPC Network Management Interface) is a network management protocol built by the OpenConfig consortium. It runs over gRPC (Google Remote Procedure Call) and HTTP/2, providing secure, high-performance streaming telemetry.

2. OpenConfig YANG Data Paths¶

Rather than cryptic SNMP OIDs, gNMI uses structured OpenConfig YANG paths:

openconfig-interfaces:interfaces/interface[name=Ethernet1]/state/counters/in-octets

Step 1 · Configure gNMI Management on Arista cEOS¶

Enable gNMI management service on spine1, spine2, leaf1, and leaf2.

leaf1leaf2spine1spine2

configure
hostname leaf1
!
management api gnmi
   transport grpc default
      ssl profile none
   provider eos-native
!
interface Loopback0
   ip address 10.255.0.11/32
   ip ospf area 0.0.0.0
!
interface Ethernet1
   no switchport
   ip address 10.0.1.2/30
   ip ospf area 0.0.0.0
!
interface Ethernet2
   no switchport
   ip address 10.0.2.2/30
   ip ospf area 0.0.0.0
!
router ospf 100
   router-id 10.255.0.11
   passive-interface Loopback0

configure
hostname leaf2
!
management api gnmi
   transport grpc default
      ssl profile none
   provider eos-native
!
interface Loopback0
   ip address 10.255.0.12/32
   ip ospf area 0.0.0.0
!
interface Ethernet1
   no switchport
   ip address 10.0.1.6/30
   ip ospf area 0.0.0.0
!
interface Ethernet2
   no switchport
   ip address 10.0.2.6/30
   ip ospf area 0.0.0.0
!
router ospf 100
   router-id 10.255.0.12
   passive-interface Loopback0

configure
hostname spine1
!
management api gnmi
   transport grpc default
      ssl profile none
   provider eos-native
!
interface Loopback0
   ip address 10.255.0.1/32
   ip ospf area 0.0.0.0
!
interface Ethernet1
   no switchport
   ip address 10.0.1.1/30
   ip ospf area 0.0.0.0
!
interface Ethernet2
   no switchport
   ip address 10.0.1.5/30
   ip ospf area 0.0.0.0
!
router ospf 100
   router-id 10.255.0.1
   passive-interface Loopback0

configure
hostname spine2
!
management api gnmi
   transport grpc default
      ssl profile none
   provider eos-native
!
interface Loopback0
   ip address 10.255.0.2/32
   ip ospf area 0.0.0.0
!
interface Ethernet1
   no switchport
   ip address 10.0.2.1/30
   ip ospf area 0.0.0.0
!
interface Ethernet2
   no switchport
   ip address 10.0.2.5/30
   ip ospf area 0.0.0.0
!
router ospf 100
   router-id 10.255.0.2
   passive-interface Loopback0

Step 2 · Production Verification¶

Verify gNMI service status on leaf1:

docker exec -i clab-telemetry-lab-leaf1 Cli -p 15 <<'EOF'
enable
show management api gnmi
EOF

Enabled: Yes
Transport: gRPC default (Port 6030)
SSL Profile: None (Insecure for local container testing)
Provider: EOS Native / OpenConfig

✅ DONE when gNMI management API shows Enabled: Yes on Port 6030.

Clean up¶

sudo containerlab destroy -t topology.clab.yml