People stop bugging me for Juniper configs. I’m not your personal create my first Juniper
config engine. Everything on my blog you may / can use if you like. I’m not going
to write your configs. Really how hard can it be to design / write your own configs.
So please stop asking me for complete configs !!!! Get a J Course or Google a bit
A very basic Juniper Snmp config. (Readonly)
{master}[edit]
marcel@re0.lab2# show snmp
location Amsterdam;
contact "netops@domain.tld";
community blablablabla {
authorization read-only;
clients {
10.10.10.1/32;
172.16.1.200/32;
}
}
Very basic and easy I’m not a personal helpdesk so figure out your self how to configure read-write 
To upgrade Junos on a M-series Juniper with redundant routing engines you do it the following way.
Log in to the master Routing Engine.
Enter the JUNOS software configuration mode:
{master}
marcel@re0.lab2> configure
Disable Routing Engine redundancy.
{master} [edit]
marcel@re0.lab2# delete chassis redundancy
Save the configuration change on both Routing Engines.
{master} [edit]
marcel@re0.lab2# commit synchronize and-quit
Log in to the backup Routing Engine.
{master}
marcel@re0.lab2> request routing-engine login other routing-engine
{backup}
marcel@re1.lab2> request system software add
/var/home/marcel/jinstall-8.xxx.x-domestic-signed.tgz reboot
Switchover to the other Routing Engine to change the role.
{backup}
marcel@re1.lab2> quit
{master}
marcel@re0.lab2> request chassis routing-engine master switch
marcel@re0.lab2>
Install the new software version on the Backup Routing Engine.
{backup}
marcel@re0.lab2> request system software add
/var/home/marcel/jinstall-8.xxx.x-domestic-signed.tgz reboot
Enable Routing Engine Redundancy again
{master}
marcel@re1.lab2> configure
[edit]
marcel@re1.lab2# rollback 1
Save the configuration change on both Routing Engines
[edit] marcel@re1.lab2> commit synchronize and-quit
If you are satisfied that the new software is running smoothly
{master}
marcel@re1.lab2> request routing-engine login other routing-engine
{backup}
marcel@re0.lab2> request system snapshot
{backup}
marcel@re0.lab2> quit
Something about aggregated links on Juniper M series.
It is not hard to config aggregated links.
[edit]
marcel@lab2# show chassis
aggregated-devices {
ethernet {
device-count 2;
}
}
---
[edit]
marcel@lab2# show interfaces ge-1/0/0
gigether-options {
802.3ad ae0;
}
[edit]
marcel@lab2# show interfaces ge-1/1/0
gigether-options {
802.3ad ae0;
}
[edit]
marcel@lab2# show interfaces ae0
description "AE0 towards lab-1";
unit 0 {
family inet {
filter {
input AMSIX-in;
output AMSIX-out;
}
address 10.10.4.2/30;
}
family inet6 {
address 2001:0960:1300:1144::1/64;
}
}
It is also possible to use load balancing per packet.