The free JNCIA-Junos course is a great start for things like this.
Original Message:
Sent: 07-01-2024 14:55
From: John Rocha
Subject: How to configure one device per EX4850 interface
Thank you for your feedback @spuluka.
The architect is the individual that no longer works here and we don't have documentation for how the configuration was delivered previously, just that the endpoint addresses were set to 172.16.0.2/.3/.4/.5 etc. The interface addresses where all me trying anything to get this to work, which as you pointed out is incorrect.
You're VLAN tip was great. I started reading and "youtubing" more about juniper VLANS and found "Configure Trunks and Access Ports on Juniper Devices". Which provided some additional information and combined with other comments I was able to configure so the endpoint can ping each other.
Thank you for your insights.
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John Rocha
Original Message:
Sent: 06-28-2024 19:42
From: spuluka
Subject: How to configure one device per EX4850 interface
The setup you show does not make logical sense.
You need to find out from the architect what the subnet is for those devices. Typically these are going to be in the same range like 172.16.0.0/29 where you would put the 172.16.0.1 on the QFX virtual interface and place all the interfaces facing the devices in the same vlan.
But whatever the expectation is creating host only addresses on an interface is not typical and not a good idea.
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Steve Puluka BSEET - Juniper Ambassador
IP Architect - DQE Communications Pittsburgh, PA (Metro Ethernet & ISP - Retired)
http://puluka.com/home
Original Message:
Sent: 06-28-2024 18:52
From: John Rocha
Subject: How to configure one device per EX4850 interface
Hello,
I am a networking newbie nitwit. My company is between IT staff members and because I've assisted the IT team in the past with tasks this has fallen on to me.
I've been tasked with making the network illustrated below work.

We have an EX4650/QFX5120 switch to connected multiple devices using fiber optic cables. The device IPs were assigned by the architects. I choose the interface IPs on a whim.
How do I configure this so that each device can communicate with each other?
I thought this would be something like a network of one with the thought of creating static routes. In my mind this was something like setting the ip addresses of the interfaces
set interfaces xe-0/0/2 unit 0 family inet address 172.16.0.105/32
set interfaces xe-0/0/4 unit 0 family inet address 172.16.0.104/32
set interfaces xe-0/0/6 unit 0 family inet address 172.16.0.103/32
set interfaces xe-0/0/8 unit 0 family inet address 172.16.0.102/32
and then configuring static routes for the endpoints
set static route 172.16.0.5/32 next-hop 172.16.0.105
set static route 172.16.0.4/32 next-hop 172.16.0.104
set static route 172.16.0.3/32 next-hop 172.16.0.103
set static route 172.16.0.2/32 next-hop 172.16.0.102
But this doesn't work. The static routes don't get added.
show | compare
after the static route changes don't have any configuration changes. And even after I commit and test with ping from it indicates no route to host, and the show route 172.16.0.2
etc. indicate there is no route (as expected).
I would appreciate some guidance or references to help with this? I've been googling and youtubing for the past two days to try and resolve this and I don't feel like I'm getting anywhere. I strongly suspect I'm not even looking for the correct terminology.
Thank you in advance for your patience and advice.
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John Rocha
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