This may seem like a simple post but I needed this info today quickly and had to google “How to Shutdown Port Juniper EX4200” The answer is very simple but not having much experience on the Juniper switches I was a bit stuck. In Cisco I would have just done a shut on the port, […]
Warning: This device has booted from the backup junos image
Whilst configuring a Juniper EX4200 switch I came across the issue where the primary boot partition had got corrupted, you get the infamous warning: This device has booted from the backup junos image banner, from here you have two options, re-install Junos or perform a recovery. As this is a new switch just sat on […]
How to Find Port from IP Address Juniper Switch
You have been given an IP address and want to find the port which the machine that owns that ip address is plugged into. First you need to find the mac address of the device show arp | match 10.1.5.34 [email protected]> show arp | match 10.1.5.34 00:00:09:fa:aa:3e 10.1.5.34 server1.domain.com vlan.1 none Now you […]
Juniper EX4200 USB Software Upgrade
I had to add a Juniper EX4200 switch to a stack today which already had 8 switches in it. There are a few criteria which Juniper specify for adding a new switch to a stack. You can have up to 10 switches in a Virtual Chassis The Software image of the new switch must match […]
Junos as a Second Language
If you are familiar with Cisco IOS and have been asked to look at some Juniper hardware you will be aware of the differences between Junos and IOS. Junos have provided this pretty good CBT course entitled Junos as a Second Language – you will need a login to the Juniper site but you can […]
JNCIA Junos Juniper Certification
For a work requirement I have been asked to certify myself on Juniper. This is going to be a slight detour from the CCIE studies but should not be log! Being mainly a Cisco Engineer, this is all very new to me so am going on a crash course in Juniper Certification. The path I […]