Hello @vsfomin,
Thanks for the feedback.
I suspect there is an issue with the YAML file, but the issue is not obvious because I copied and pasted the information you provided into a file, launched a Python shell, and imported the testbed file without an issue -- no errors similar to what you show above.
The shell did ask for "enable passwords" for two of the devices, but did NOT generate errors, even when I attempted to connect to one of the devices.
Here's the output showing the Python session:
(tvenv) [fjm@myServer .tmp]$ python
Python 3.8.0 (default, Apr 28 2020, 13:27:51)
[GCC 9.3.1 20200408 (Red Hat 9.3.1-2)] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>>
>>> from pyats.topology import loader
>>> tb_file = "testbed1.yml"
Enter enable password for device SW-PD-01:
Enter enable password for device SW-PD-02:
>>> dev = tb.devices["SW-PD-01"]
>>> dev.connect()
2021-12-21 01:03:51,334: %UNICON-INFO: +++ SW-PD-01 logfile /tmp/SW-PD-01-cli-20211221T010351333.log +++
2021-12-21 01:03:51,335: %UNICON-INFO: +++ Unicon plugin iosxe +++
OpenSSH_7.4p1, OpenSSL 1.0.2k-fips 26 Jan 2017
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 58: Applying options for *
debug1: Connecting to 10.0.240.171 [10.0.240.171] port 22.
2021-12-21 01:03:51,349: %UNICON-INFO: +++ connection to spawn: ssh -l admin -v 10.0.240.171 -oStrictHostKeyChecking=no -oUserKnownHostsFile=/dev/null, id: 139941292532256 +++
2021-12-21 01:03:51,349: %UNICON-INFO: connection to SW-PD-01
This line in your output tells us that the YAML file wasn't loaded properly:
pyats.utils.yaml.exceptions.LoadError: Content of 'testbed1.yml' failed to load into a dict.
After loading the YAML file successfully, you should be able to "ask" Python to display the dictionary that is built from the data: tb.__dict__
Here's the dictionary that was built when I loaded your YAML file:
>>> tb.__dict__
{'name': 'testbed1', 'alias': 'testbed1', 'servers': AttrDict({}), 'custom': AttrDict({}), 'credentials': Credentials(NestedAttrDict({})), 'devices': TopologyDict({'SW-PD-01': <Device SW-PD-01 at 0x7f46a24794f0>, 'SW-PD-02': <Device SW-PD-02 at 0x7f46a2479400>, 'SW-PD-03': <Device SW-PD-03 at 0x7f46a2479700>}), 'tacacs': AttrDict({'login_prompt': 'login:', 'password_prompt': 'Password:', 'username': 'vsuri001'}), 'passwords': AttrDict({'tacacs': 'lab', 'enable': 'lab', 'line': 'lab', 'linux': 'lab'}), 'clean': AttrDict({}), 'testbed_file': 'testbed1.yml', 'ipv4_cache': <genie.conf.base.utils.IPv4InterfaceCache object at 0x7f46a2bce2e0>, 'ipv6_cache': <genie.conf.base.utils.IPv6InterfaceCache object at 0x7f46a2bb0790>, 'mac_cache': <genie.conf.base.utils.MACCache object at 0x7f46a2bce7c0>, 'raw_config': {'devices': {'SW-PD-01': {'connections': {'cli': {'ip': '10.0.240.171', 'command': 'ssh -v 10.0.240.171 -oStrictHostKeyChecking=no -oUserKnownHostsFile=/dev/null'}}, 'credentials': {'default': {'password': 'secretpassword', 'username': 'admin'}, 'enable': {'password': '%ASK{}'}}, 'os': 'iosxe', 'type': 'iosxe'}, 'SW-PD-02': {'connections': {'cli': {'ip': '10.0.240.172', 'command': 'ssh -v 10.0.240.172 -oStrictHostKeyChecking=no -oUserKnownHostsFile=/dev/null'}}, 'credentials': {'default': {'password': 'secretpassword', 'username': 'admin'}, 'enable': {'password': '%ASK{}'}}, 'os': 'iosxe', 'type': 'iosxe'}, 'SW-PD-03': {'connections': {'cli': {'ip': '10.0.240.173', 'command': 'ssh -v 10.0.240.173 -oStrictHostKeyChecking=no -oUserKnownHostsFile=/dev/null'}}, 'credentials': {'default': {'password': 'secretpassword', 'username': 'admin'}, 'enable': {'password': 'cisco'}}, 'os': 'iosxe', 'type': 'iosxe'}}, 'testbed': {'testbed_file': 'testbed1.yml', 'name': 'testbed1'}, 'topology': {}}}
>>> You won't be able to attach to any devices until you can successfully load the YAML file.
What version of pyATS are you using? Would you please provide the output from this command? pyats version check
I'm running an older version of pyATS -- 21.6, so perhaps there's an issue w/ the version that you're using.
There is a Webex Space where you can get help directly from the development team.
Here's the URL to join the Webex space and raise your question.
