2- Family inet , bridge , ethernet-switching and other

https://www.juniper.net/documentation/en_US/junos/topics/reference/configuration-statement/family-edit-interfaces.html

Family bridge is used when you want a port that has more than one logical unit, each with the same or different encapsulations. Bridge domains are associated with GRE interface with the corresponding BD VLAN.

ethernet-switching only one logical unit

EX9200

root@EX9208-1-RE1# set interfaces ge-1/0/1.100 family ?
Possible completions:
> ethernet-switching   Ethernet switching parameters
> inet                 IPv4 parameters
> inet6                IPv6 protocol parameters
> iso                  OSI ISO protocol parameters
> mpls                 MPLS protocol parameters
> vpls                 Virtual private LAN service parameters
[edit]

QFX5110

root@QFX5110-2# set interfaces ge-0/0/0.100 family ?
Possible completions:
> ccc                  Circuit cross-connect parameters
> ethernet-switching   Ethernet switching parameters
> inet                 IPv4 parameters
> inet6                IPv6 protocol parameters
> iso                  OSI ISO protocol parameters
> mpls                 MPLS protocol parameters
> vpls                 Virtual private LAN service parameters
{master:0}[edit]

vMX

jcluser@vMX-0# set interfaces ge-0/0/3.0 family ?
Possible completions:
> bridge               Layer-2 bridging parameters
> ccc                  Circuit cross-connect parameters
> inet                 IPv4 parameters
> inet6                IPv6 protocol parameters
> iso                  OSI ISO protocol parameters
> mpls                 MPLS protocol parameters
> pppoe                PPP over Ethernet underlying interface-specific options
> tcc                  Translational cross-connect parameters
> vpls                 Virtual private LAN service parameters
[edit]