VLANs, Access and Trunking Ports on Cisco vs JunOS

Both Cisco IOS and Juniper JunOS, the operating systems for their respective networking devices, implement VLANs with similar core functionalities but differ in their configuration syntax and some default behaviors.

Here's the some highlighting VLANs, Access Ports, and Trunking Ports, comparing Cisco and JunOS:

VLANs Configuration
Cisco	Juniper
`SW(config)#vlan {vlan-id} SW(config-vlan)#name {Vlan-Name} Example: SW(config)#vlan 10 SW(config-vlan)#name VLAN-10`	`root@SW1#set vlans {vlan-name} vlan-id {vlan-id} Example: root@SW1#set vlans VLAN-10 vlan-id 61`

VLANs Configuration

Cisco Juniper

SW(config)#vlan {vlan-id}                  

SW(config-vlan)#name {Vlan-Name}

Example:
SW(config)#vlan 10              

SW(config-vlan)#name VLAN-10

root@SW1#set vlans {vlan-name} vlan-id {vlan-id}

Example:
root@SW1#set vlans VLAN-10 vlan-id 61

Access Port Configuration
Cisco	Juniper
`SW(config)#interface {inteface-name} SW(config-if)#switch mode access SW(config-if)#switch access vlan {vlan-no} Example: SW(config)#interface {inteface-name} SW(config-if)#switch mode access SW(config-if)#switch access vlan 10`	`root@SW1#set interfaces {interface-name} unit 0 family ethernet-switching port-mode access root@SW1#set interfaces {interface-name} unit 0 family ethernet-switching vlan members {vlan-name} Example: root@SW1#set interfaces unit 0 family ethernet-switching port-mode access root@SW1#set interfaces ge-0/0/0 unit 0 family ethernet-switching vlan members VLAN-10`

Access Port Configuration

Cisco Juniper

SW(config)#interface {inteface-name}                                       
SW(config-if)#switch mode access
SW(config-if)#switch access vlan {vlan-no}


Example:
SW(config)#interface {inteface-name}
SW(config-if)#switch mode access
SW(config-if)#switch access vlan 10

root@SW1#set interfaces {interface-name} unit 0 family ethernet-switching port-mode access

root@SW1#set interfaces {interface-name} unit 0 family ethernet-switching vlan members {vlan-name}

Example:
root@SW1#set interfaces unit 0 family ethernet-switching port-mode access


root@SW1#set interfaces ge-0/0/0 unit 0 family ethernet-switching vlan members VLAN-10

Trunk Port Configuration
Cisco	Juniper
`SW(config)#interface {inteface-name} SW(config-if)#switchport trunk encapsulation dot1q SW(config-if)#switchport mode trunk Example: SW(config)#interface gigabitEthernet 0/0 SW(config-if)#switchport trunk encapsulation dot1q SW(config-if)#switchport mode trunk`	`root@SW1#set interfaces {interface-name} unit 0 family ethernet-switching port-mode trunk root@SW1#set interfaces {interface-name} unit 0 family ethernet-switching vlan members {vlan-name or all} Example: root@SW1#set interfaces unit 0 family ethernet-switching port-mode access root@SW1#set interfaces ge-0/0/0 unit 0 family ethernet-switching vlan members [VLAN-10 VLAN-20] OR root@SW1#set interfaces ge-0/0/0 unit 0 family ethernet-switching vlan members all`

Trunk Port Configuration

Cisco Juniper

SW(config)#interface {inteface-name}                                            

SW(config-if)#switchport trunk encapsulation dot1q

SW(config-if)#switchport mode trunk

Example:
SW(config)#interface gigabitEthernet 0/0

SW(config-if)#switchport trunk encapsulation dot1q

SW(config-if)#switchport mode trunk

root@SW1#set interfaces {interface-name} unit 0 family ethernet-switching port-mode trunk

root@SW1#set interfaces {interface-name} unit 0 family ethernet-switching vlan members {vlan-name or all}

Example:
root@SW1#set interfaces unit 0 family ethernet-switching port-mode access

root@SW1#set interfaces ge-0/0/0 unit 0 family ethernet-switching vlan members [VLAN-10 VLAN-20]

OR

root@SW1#set interfaces ge-0/0/0 unit 0 family ethernet-switching vlan members all

VLANs, Access and Trunking Ports on Cisco vs JunOS

VLANs Configuration

Access Port Configuration

Trunk Port Configuration

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