Well the documentation can be confusing.

In re0 and re1 group you put the configuration specific to one RE. On my router I only set the host-name. The loopback does not have to be different between the two RE, so you can let it on the standard hierarchy.

--
Raphael Mazelier


Le 09/05/2016 à 14:11, v a écrit :
Hello,

I am new to networking and trying to understand the initial configuration on a Juniper MX router with dual REs: http://www.juniper.net/techpubs/en_US/junos14.2/topics/task/configuration/routing-engine-dual-initial-configuration.html

Step 6 is the following:
" Set the loopback interface address for the re0 configuration group:
[edit groups]
root@host# set re0 interfaces lo0 unit 0 family inet address address/prefix-length"

Why do I need to give the re0 group a loopback interface address in the first place?
What address should I give to the loopback interface?

Regards,
v
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