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Pre Checks -

> show | compare -----> Check if any pending config is their.
> Commit -----> apply and save pending config if any
> request system configuration rescue save -----> Create a restore point.

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Optional Config -

set chassis cluster reth-count 10 -----> Reth count can be changed to 10 if in future no. can increase.
set interfaces ge-0/0/3 speed 1000m -------> Currently at 100 mbps We can change the speed based on connected device.
delete interfaces ge-0/0/3 gigether-options no-auto-negotiation
set interfaces ge-0/0/5 speed 1000m
delete interfaces ge-0/0/5 gigether-options no-auto-negotiation

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MDMZ Change
 
Delete interfaces reth0 unit 0 family inet address 165.136.121.180/29
set interface reth0 vlan-tagging
set interfaces reth0 redundant-ether-options redundancy-group 1
set interfaces reth0 unit X vlan-id 'X' -----------------------> Where X is vlan tag number
set interfaces reth0 unit X family inet address 'X.X.X.X/24'
set interfaces reth0 unit Y vlan-id Y -------------------------> Where Y is vlan tag number
set interfaces reth0 unit Y family inet address 'Y.Y.Y.Y'/24
set vlans 'name' vlan-id X
set vlans 'name' vlan-id Y
set interfaces "ge-0/0/11" unit 0 family ethernet-switching vlan members X ------------> ge-0/0/11 taken as example
set interfaces "ge-0/0/12" unit 0 family ethernet-switching vlan members Y

DMZ Change

Delete interfaces reth2 unit 0 family inet address 165.136.227.20/29
set interface reth2 vlan-tagging
set interfaces reth2 redundant-ether-options redundancy-group 1
set interfaces reth2 unit A vlan-id 'A' ------------------------> Where A is vlan tag number
set interfaces reth2 unit A family inet address 'A.A.A.A/24'
set interfaces reth2 unit B vlan-id B --------------------------> Where B is vlan tag number
set interfaces reth2 unit B family inet address 'B.B.B.B'/24
set vlans 'name' vlan-id A
set vlans 'name' vlan-id B
set interfaces "ge-0/0/13" unit 0 family ethernet-switching vlan members A ------------> ge-0/0/13 taken as example
set interfaces "ge-0/0/14" unit 0 family ethernet-switching vlan members B

show | compare rollback 0
Commit
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Rollback -

rollback rescue -----> will rollback all changes to last committed config.
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