Junos netconf over ssh-keygen

In part 1 of this blog we talked about red hat ansible at a highlevel, how it is quickly being adopted, and ways of potentially increasing the performance of ansible. This software is not officially supported by juniper networks,but by a team dedicated to helping customers, partners and the development community. In this video, we go over how to push set commands to a networking devices configuration file and commit the changes using ansible. Sends a request to the remote device running junos to execute the specified rpc using the netconf transport. Use this guide to remotely manage the configuration of devices running junos os using the network configuration protocol netconf, understand the native yang data models on devic. Configuring event logging to a local file, configuring event logging to a remote server, configuring event logging to a remote server when initiating the connection from the remote server. Remote operations are done using ssh, scp, and sftp.

It is only used when the remote peer does not advertise a base protocol version supporting chunked encoding, i. Under the hood, we are going to use ansible and juniper. Junos how to regenerate ssh host keys on junos devices in. Communication between the junos device and junos space. This document defines how netconf can be used within a secure shell ssh session, using the ssh connection protocol rfc4254 over the ssh transport protocol rfc4253. Login with ssh keys instead of passwords to junos router. Key management with sshadd, sshkeysign, sshkeyscan, and ssh keygen. The easiest way to build a network automation lab zeroslash. Srx ssh secure shell does not work from srx and gives. Contribute to juniper go netconf development by creating an account on github. Junos generating ssh rsadsa keys locally on devices running junos os.

This mapping will allow netconf to be executed from a secure shell session by a user or application. By taylor owen, kovarus automation solution architect. It supports xml syntax which is used internally by junos, configuration text or set commands. Thanks for contributing an answer to network engineering stack exchange. Junos pyez user authentication overview, authenticating junos pyez users using a password, authenticating junos pyez users using ssh keys. To create a key pair, lauch sshkeygen on a new console and follow the prompts. Authenticating junos pyez users techlibrary juniper networks. An alternate method of specifying a netconf over serial console connection to the junos device using telnet to a console server. Support support downloads knowledge base case manager my juniper community knowledge base. Ansible with juniper ntwrk notes working networking. Ansible and juniper junos using ssh keys arturo baldo.

In an earlier post i spoke of leveraging sshagent for accessing junos based platforms. For our snippet we need text mode, which means the following syntax. Acx series,ex series,m series,mx series,qfx series,srx series,t series. A change to the netconf interface port value will result in a planned restart of confd and temporary loss of connectivity over the netconf and rest if enabled interfaces.

Stack overflow for teams is a private, secure spot for you and your coworkers to find and share information. Acx series,ex series,m series,mx series,ptx series,qfx series,srx series,t series. The default, internet assigned numbers authority iana is 830, but junos os allows you to select any arbitrary number. If so, it means the user for whom you are trying to add the device to junos space performs a rollback when junos space tries to commit the netconf service on the device and hence the device discovery fails. To create a key pair, lauch ssh keygen on a new console and follow the prompts.

Rfc 4742, using the netconf configuration protocol over secure shell ssh, requires that the netconf server, by default, provide the client device with access to the netconf ssh subsystem when the ssh session is established over a dedicated ianaassigned tcp port. Ansible with juniper speaking of centralized management of network devices would be a great idea to demonstrate some possibilities to use netconf and opensource software. This means you need to first log in to the jumphost, and from there you can access the. Junos netconf over ssh setup junos automation cookbook. Anyhow, most of the time we do not interact with that low level layer. The value of this option must be a string in the format telnet.

Start typing a product name to find software downloads for that product. While i have not spent as much time on juniper kit as i would have liked over the past few years, the one awesome thing to see and experience firsthand is that they have a unified api netconf. Red hat ansible for networking automation 2 of 2 kovarus. Minimum permissions needed for show commands over netconf 2020. Redundancy interface management process checking new configuration jan 20 17. This article describes the procedure to generate ssh rsadsa keys on a device running junos os, and to configure the device to use a passwordless public keybased encrypted ssh authentication. The document containing the element is the first xml document that the netconf client sends after the netconf session is established. Ansible does not expose a channel to allow communication between the user and the ssh process to accept a password manually to decrypt an ssh key when using this connection plugin which is the default. I use a linux box, from where i ssh to routers, and here is how to sort it out. Im going to create a totally new virtualenv but if you wish to use an existing one feel free to do so. We will be using the official library for juniper junos called pyez. There are scripting benefits to using an sshagent but if scripting is not your concern then at the very least there is a convenience factor when accessing the junos based. Establishing an ssh connection for a netconf session.

Is it possible to edit the prefix list through netconf in juniper router. As you can imagine ansible which is a product of redhat has extensive documentation and it can be found here when getting more serious about ansible then getting your file structure correct and ready for scaling up will reap dividends check out this. Sample syslog server configuration on a linux system. This blog post takes that earlier blog entry a step further. This article describes how to resolve the ssh login issue which occurs when the rsa key is changed at remote side host or the rsa key is deleted from the client. Search our knowledge base sites to find answers to your questions. Use of a dedicated port makes it easy to identify and filter netconf traffic. This connection plugin allows ansible to communicate to the target machines via normal ssh command line. Ex unable to ssh or telnet to ex switch juniper networks. Netconf over ssh is a very popular transport mechanism when talking about network automation. How to configure juniper devices using configuration data models written in yang and published on github by openconfig. What network ports need to be opened for junos space. This article provides a simple method to scan a given network subnet to list host names and ip addresses all junos devices present in it.

Contribute to juniper netconf perl development by creating an account on github. Before we can login or run scripts against a junos based platform we have to setup junos to use sshkeys. This netconf protocol configuration mode command controls the level of verification the server does on client certificates. Configuring event logging to a local file, configuring event logging to a remote server, configuring event logging to a remote server when initiating the connection from the. Enable access to the netconf ssh subsystem using the default port number 830, as specified by rfc 4742. Netconf over ssh runs on a separate tcp port to the conventional ssh transport. The pyez mode used to establish a netconf connection to the junos device. Junos os netconf and ssh tunneling part 1 lets say you have a network of devices that are behind a firewall and you can only access them through a jumphost. The basic code can be modified easily to perform configuration changes or to collect any required information from those devices using netconf over. Jan 12, 2020 to create a key pair, lauch ssh keygen on a new console and follow the prompts. Getting up and running with junos security alerts and vulnerabilities product alerts and software release notices problem report pr search tool eol notices and bulletins jtac user guide customer care user guide pathfinder srx high availability configurator srx vpn configurator training courses and videos end user licence agreement global search.

Junos generating ssh rsadsa keys locally on devices. It uses an ssh transport to communicate netconf commands, parse data and transform it to proper xml, and retrieve xml for parsing and transformation into a more meaningful structure. Specifies the dns host name or address for connecting to the remote device over the specified transport. Ask all knowledge base sites all knowledge base sites junose defect ka knowledge base security advisories technical bulletins technotes sign in to display secure content and recently. In this 2 nd part we will dive deeper into ansible in regard to network automation from my professional. Using netconf to apply configuration changes junos. Ansible configuration settings ansible supports several sources for configuring its behavior, including an ini file named g, environment variables, commandline options, playbook keywords, and variables.

They provide a standard interface for ansible to execute tasks on those network devices. Netconf plugins are abstractions over the netconf interface to network devices. The service side consists of sshd, sftpserver, and sshagent. Cani prevent a secondary dhcp server on the lan from taking over from srx juniper s dhcp. Make sure that youve got a working netconf over ssh capability with the junos os platform as per the first recipe in this chapter, junos netconf over ssh setup. The reply is then returned to the playbook in the xml key. No such file or directory this is the directory we will need to create. The value of host is used as the destination address for the transport. Junos pyez is a python library to remotely manageautomate junos devices. Netconf enabled platform options ansible documentation. Juniper vsrx automation with ansible jason edelmans blog. Defining connection and authentication options, understanding the default values for the ansible galaxy modules for junos os, authenticating the user using ssh keys, authenticating the user using a playbook or commandline password prompt, authenticating the user using an ansible vaultencrypted file.

If an alternate output format is requested, the reply is transformed to the requested output. Uptodate information on the latest juniper solutions, issues, and more. These plugins generally correspond onetoone to network device platforms. This utility will create two files, which are the public and private keys. Sep 04, 2017 below we are also setting netconf on juniper devices to leverage the native device api. This can be used to load configuration data into the candidate configuration of the junos device. In the juniper netconf documentation we find the useful command. Generating ssh rsadsa keys on exseries switches and. Junos python script to scan a network subnet for juniper. Establishing an ssh connection for a netconf session, prerequisites for establishing an ssh connection for netconf sessions, prerequisites for establishing an outbound ssh connection for netconf. Ansible configuration settings ansible documentation. Before you can use netconf to connect to a switch, you must. Questions tagged juniperjunos network engineering stack. When netconf over ssh is used in this manner, the ssh server makes use of a protocol feature called subsystems.

Junos automation cookbook secure shell command line. This allows the ssh server to directly connect to another internal component. Rfc 6242 using the netconf protocol over secure shell ssh. Using the netconf configuration protocol over secure shell. In order to be able to connect to junos via ansible, both ssh and netconf services has to be enabled on the remote host. A value of none uses the default netconf over ssh mode. Juniper networks contributed heavily to both of the rfc standards. Contribute to junipergonetconf development by creating an account on github. Endofmessage framing mechanism this mechanism exists for backwards compatibility with implementations of previous versions of this document. Depending on the values of the host and port options, a value of telnet results in either a direct netconf over telnet connection to the junos device, or a netconf over serial console connection to the junos device using telnet to a console server. Rfc 6242 netconf over ssh june 2011 as states, the netconf client also sends an xml document containing a element to indicate the netconf clients capabilities to the netconf server.