snappi 0.1.43

The Snappi Open Traffic Generator Python Package

Test scripts written using snappi (a python library) can be executed against
any traffic generator conforming to Open Traffic Generator API.

The repository is under active development and is subject to updates. All efforts will be made to keep the updates backwards compatible.

Install on a client

python -m pip install --upgrade snappi
# or install along with ixnetwork extension
python -m pip install --upgrade "snappi[ixnetwork]"

Start scripting

"""
Configure a raw TCP flow with,
- tx port as source to rx port as destination
- frame count 10000, each of size 128 bytes
- transmit rate of 1000 packets per second
Validate,
- frames transmitted and received for configured flow is as expected
"""

import snappi
# when using ixnetwork extension, host is IxNetwork API Server
api = snappi.api(host='https://localhost:443', ext='ixnetwork')
# new config
config = api.config()
# when using ixnetwork extension, port location is chassis-ip;card-id;port-id
tx, rx = (
    config.ports
    .port(name='tx', location='192.168.0.1;2;1')
    .port(name='rx', location='192.168.0.1;2;2')
)
# configure layer 1 properties
ly, = config.layer1.layer1(name='ly')
ly.port_names = [tx.name, rx.name]
ly.speed = ly.SPEED_10_GBPS
ly.media = ly.FIBER
# configure flow properties
flw, = config.flows.flow(name='flw')
# flow endpoints
flw.tx_rx.port.tx_name = tx.name
flw.tx_rx.port.rx_name = rx.name
# configure rate, size, frame count
flw.size.fixed = 128
flw.rate.pps = 1000
flw.duration.fixed_packets.packets = 10000
# configure protocol headers with defaults fields
flw.packet.ethernet().vlan().ipv4().tcp()
# push configuration
api.set_config(config)
# start transmitting configured flows
ts = api.transmit_state()
ts.state = ts.START
api.set_transmit_state(ts)
# create a query for flow metrics
req = api.metrics_request()
req.flow.flow_names = [flw.name]
# wait for flow metrics to be as expected
while True:
    res = api.get_metrics(req)
    if all([m.frames_tx == 10000 == m.frames_rx for m in res.flow_metrics]):
        break