Nokia SR OS GNMI Server

MCP server for managing Nokia SR OS devices via gNMI (gRPC) from Claude Desktop.

Features

• gNMI Get — retrieve configuration and operational state with YANG paths
• gNMI Set — update, replace, or delete configuration
• MD-CLI commands — via Nokia gNMI CLI extension
• gNMI Capabilities — discover supported models and encodings
• Runtime credentials — no passwords in config files
• Multi-device — manage multiple SR OS devices simultaneously
• JSON output — clean json_ietf encoding (easier to read than XML)

Installation

cd nokia-gnmi-mcp

# Option A: uv (recommended)
uv sync

# Option B: pip
pip install -e .

Claude Desktop Configuration

Edit %APPDATA%\Claude\claude_desktop_config.json (Windows):

{
  "mcpServers": {
    "nokia-gnmi": {
      "command": "uv",
      "args": [
        "--directory",
        "C:\\Users\\YourUser\\nokia-gnmi-mcp",
        "run",
        "nokia-gnmi-mcp"
      ]
    }
  }
}

Usage

1. Connect to a device

"Connect to my SR OS router at 192.168.1.1 via gNMI, username admin, password Nokia123, call it pe1"

2. Get configuration

"Show me the router interfaces config on pe1"

Claude uses path: /configure/router[router-name=Base]/interface

3. Get operational state

"What's the BGP neighbor state on pe1?"

Claude uses path: /state/router[router-name=Base]/bgp/neighbor

4. Update configuration

"Create a loopback lo5 with IP 10.10.10.5/32 on pe1"

Claude uses gNMI Set update.

5. Delete configuration

"Remove interface test from pe1"

Claude uses gNMI Set delete.

Tools Reference

Tool	gNMI Op	Description
sros_connect	—	Connect to device (host, port, credentials, TLS options)
sros_disconnect	—	Close gNMI session
sros_get_config	Get (CONFIG)	Retrieve configuration by YANG path
sros_get_state	Get (STATE)	Retrieve operational state by YANG path
sros_set_update	Set (update)	Merge configuration changes
sros_set_replace	Set (replace)	Replace configuration subtree
sros_set_delete	Set (delete)	Delete configuration elements
sros_cli_command	CLI ext	MD-CLI show commands via gNMI
sros_capabilities	Capabilities	List supported models and encodings
sros_list_sessions	—	List active sessions

Nokia YANG Path Reference

Configuration paths (/configure/...)

/configure/router[router-name=Base]/interface
/configure/router[router-name=Base]/bgp
/configure/router[router-name=Base]/isis[isis-instance=0]
/configure/port[port-id=1/1/c2/1]
/configure/card[slot-number=1]
/configure/service/vprn[service-name=CUST-1]
/configure/service/vpls[service-name=L2-1]
/configure/system

State paths (/state/...)

/state/router[router-name=Base]/interface[interface-name=to-pe2]
/state/router[router-name=Base]/bgp/neighbor
/state/port[port-id=1/1/c2/1]
/state/card[slot-number=1]
/state/system/information

Differences from NETCONF MCP

Feature	NETCONF MCP	gNMI MCP
Protocol	NETCONF/SSH	gRPC/HTTP2
Port	830	57400
Encoding	XML	JSON (json_ietf)
Candidate datastore	Yes (commit/rollback)	No (direct apply)
Output readability	XML verbose	JSON clean
Streaming telemetry	No	Possible (future)

Troubleshooting

Connection refused: Ensure gRPC is enabled on SR OS:

configure system grpc admin-state enable
configure system grpc allow-unsecure-connection
configure system grpc gnmi admin-state enable
configure system grpc gnmi auto-config-save true

TLS errors: Use skip_verify=true for lab or insecure=true for non-TLS connections.

Timeout: Increase timeout in sros_connect. Large state queries may need more time.