Learning IOS and JUNOS

A bird in the hand is worth two in the bush Day 3 - How to view or modify JUNOS configuration ? Entering Configuration Mode When you stand behind an engineer, you can identify the engineer is Cisco or Juniper guy easily.  Most cisco engineers like to use the command 'conf t' to enter configure mode of router or switch. router>  enable Password: router#  conf t Enter configuration commands, one per line.  End with CNTL/Z. router(config)# When you want to show any results, you don't need to exit to the privilege mode(#) to show it. You can leverage 'do' command to check the status. router(config)#  do sh ip int brief Interface              IP-Address      OK? Method Status                Protocol GigabitEthernet1       10.17.14.195    YES manual up                    up       GigabitEthernet2       unassigned      YES unset  administratively down down     GigabitEthernet0       unassigned      YES manual up                    up      

Junos Script Automation is a powerful and flexible on-box toolset which provides customization of network behavior, adaption to what your application expects to configure, manage and diagnose if and when needed. It sits right above the Junos OS, with a northbound interface to Junos Space applications, and southbound access to Junos SDK applications and native management plane instrumentation. This customized programmable solution makes your application smarter and better in real-time. In Juniper official website provides many script samples to match part of common requests. In my company, we deployed many inter-connections EBGP/IBGP between router or layer 3 switch. So I picked one op script from the JUNOS Script Library - show bgp policy : display all routing-policies in sequential order for a selected BGP peer.

Configuration Management Day 2 - How to review router configuration ? In Cisco IOS, it has two default configuration files:  (1) startup-config: is used for initialization of router boot up process   (2) running-config.  is the real-time concurrent configuration repository whenever you type any commands in IOS. And how do you differentiate screen output is the startup-config or running-config ?

Once a use, forever a custom My first-time experience of Cisco router installation was in 1997, when I was a junior network engineer in a small company. I remembered that day I finished installing a customer router on-site for only 15 mins then I left and went back again after 2 hours to configure the router via console again..because I forgot to configure password under line vty (I told myslef I would never made such stupid mistake again like that - Password required, but none set ) After 13 years later, I started to learn JUNOS since 2010. Because I familiar Cisco IOS so much, so I knew the feeling of use behavior change from IOS to JUNOS. The hierarchical structure is not so easy to read when you see it in the first time.(especially when you have no any programming experience) However, having the use experience of Cisco IOS is a not a bad thing before you start to learn JUNOS. I believe if you can leverage your previously IOS command knowledge then map to JUNOS relative state

In order to prepare the future migration from Juniper SSG to SRX, so I tried to use SRX GUI interface to see how its easy for operation team to sustain this. This is the first time I tried to use GUI to manage a router, and if you are not familiar with Juniper SRX features and functions, I have to say its a quick start to have a glance overview of Juniper SRX by web interface. For many junior engineers, if they can have what-you-see-what-you-get interface, they will accept new technology as fast as they can or they might refuse to try or to learn new technology if there's no time pressure or instructions from high-level managers directly . We are still using CLI to control most routing and switching network device today, but I believe someday the condition may change if the network virtualization come true.(I think no one would like to control firewall by CLI, isn't it ?)

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