gnmi-eos

gNMI CLI tool and Python library for Arista EOS devices.

Interact with Arista EOS devices via gNMI/YANG: get configuration and state, push changes, subscribe to counters and events.

Features

CLI — usable via uvx gnmi-eos or installed globally
Library — importable as from gnmi_eos import GNMIClient
Validated YANG paths for EOS 4.35.0F (OpenConfig + Arista experimental models)

Installation

# As a CLI tool with uvx (no install needed)
uvx --from git+https://gitea.arnodo.fr/Damien/gnmi-eos gnmi-eos --help

# Or install permanently
uv tool install git+https://gitea.arnodo.fr/Damien/gnmi-eos

CLI Usage

Credentials can be passed as options or via environment variables:

export GNMI_TARGET=leaf1:6030
export GNMI_USERNAME=admin
export GNMI_PASSWORD=admin

Get capabilities

gnmi-eos capabilities --target leaf1:6030

Get data

# Get interface state
gnmi-eos get --target leaf1:6030 --path "/interfaces/interface[name=Ethernet1]/state"

# Get config only
gnmi-eos get --target leaf1:6030 --path "/interfaces" --type config

# Output as raw JSON or save to file
gnmi-eos get --target leaf1:6030 --path "/" --output json
gnmi-eos get --target leaf1:6030 --path "/" --output file:dump.json

# Subscribe to interface state changes (on-change)
gnmi-eos subscribe --target leaf1:6030 \
    --path "/interfaces/interface/state/oper-status" \
    --mode on-change

# Sample interface counters every 10s
gnmi-eos subscribe --target leaf1:6030 \
    --path "/interfaces/interface[name=Ethernet1]/state/counters" \
    --mode sample --interval 10

# Multiple paths, stop after 5 updates
gnmi-eos subscribe --target leaf1:6030 \
    --path "/interfaces/interface/state/oper-status" \
    --path "/network-instances/network-instance[name=default]/protocols/protocol[identifier=BGP][name=BGP]/bgp/neighbors/neighbor/state/session-state" \
    --count 5

Set configuration

# Dry-run (default — safe)
gnmi-eos set --target leaf1:6030 \
    --path "/interfaces/interface[name=Ethernet1]/config/description" \
    --value "Uplink to Spine"

# Actually apply
gnmi-eos set --target leaf1:6030 \
    --path "/interfaces/interface[name=Ethernet1]/config/description" \
    --value "Uplink to Spine" \
    --no-dry-run

Show known YANG paths

gnmi-eos paths

Library Usage

from gnmi_eos import GNMIClient
from gnmi_eos.yang.paths import Interfaces, BGP, FabricSubscriptions

with GNMIClient(host="leaf1", port=6030, username="admin", password="admin") as client:
    # Get capabilities
    caps = client.capabilities()

    # Get interface counters
    counters = client.get(Interfaces.counters("Ethernet1"))

    # Get BGP neighbor state
    state = client.get(BGP.neighbor_state("10.0.0.1"))

    # Subscribe to interface changes
    for update in client.subscribe(
        paths=[str(FabricSubscriptions.INTERFACE_STATE)],
        stream_mode="on-change",
    ):
        print(update)

YANG Models

Validated against Arista EOS 4.35.0F with ContainerLab (cEOS).

Category	Model
Interfaces, VLANs, BGP	`openconfig-*`
VXLAN	`arista-exp-eos-vxlan`
MLAG	`arista-exp-eos-mlag`
EVPN	`arista-exp-eos-evpn`

Note: MLAG and EVPN state (peer status, learned routes) is not exposed via gNMI — use eAPI for operational state.

Subscription Notes

For Arista EOS, use native paths without module prefixes for ON_CHANGE subscriptions:

✅  /interfaces/interface[name=Ethernet1]/state
❌  /openconfig-interfaces:interfaces/...

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