What is the encapsulation dot1q command?
What is the encapsulation dot1q command?
Router(config-subif)# encapsulation dot1q 1. Enables IEEE 802.1Q encapsulation of traffic on a specified subinterface in VLANs, and defaults the associated VLAN as a native VLAN.
What is trunk encapsulation dot1q?
The switchport trunk encapsulation dot1q command tells the switch that the interface should use IEEE 802.1Q encapsulation on the frames when the interface is configured as a trunk. Basically 802.1Q inserts a VLAN tag on the frames. This contrasts with ISL that actually encapsulates the frames with an ISL frame.
What are the two Ethernet trunk encapsulation modes?
Trunking Overview Two trunking encapsulations are available on all Ethernet ports: Inter-Switch Link (ISL)—ISL is a Cisco-proprietary trunking encapsulation. 802.1Q—802.1Q is an industry-standard trunking encapsulation.
How do you set trunking between switches?
To enable trunk links, configure the ports on either end of the physical link with parallel sets of commands. To configure a switch port on one end of a trunk link, use the switchport mode trunk command. With this command, the interface changes to permanent trunking mode.
How do you set a trunk on a Cisco switch?
- SUMMARY STEPS. enable. configure terminal.
- interface interface-id. switchport mode trunk. switchport trunk allowed vlan {add | all | except | remove} vlan-list.
- end. show interfaces interface-id switchport. copy running-config startup-config.
How do I configure subinterface?
To configure additional IP interfaces over the VLAN major interface:
- Create a new VLAN subinterface by adding a unique subinterface number to the interface identification command. host1(config-if)#interface fastEthernet 4/1.2.
- Assign a VLAN ID for the subinterface.
- Assign an IP address and mask.
How do you assign a subinterface to a VLAN?
To assign a VLAN ID to a subinterface (or to modify the VLAN ID that is currently assigned to a subinterface), use the dot1q vlan command in subinterface configuration mode. To remove the VLAN ID assigned to a subinterface, use the no form of this command.
What is encapsulation example?
Encapsulation in Java is a process of wrapping code and data together into a single unit, for example, a capsule which is mixed of several medicines. We can create a fully encapsulated class in Java by making all the data members of the class private.
What is encapsulation in VLAN?
What is VLAN encapsulation? When a switch port is configured to function as a trunk port, it adds unique identification tags – either 802.1Q tags or Inter-Switch Link (ISL) tags to the frames as they move between switches.
How is encapsulation done?
Generally, Encapsulation is a process by which a lower-layer protocol receives data from a higher-layer protocol and then places the data into the data portion of its frame. Thus, encapsulation is the process of enclosing one type of packet using another type of packet.
What is ISL encapsulation?
ISL is Cisco’s VLAN encapsulation protocol and is supported only on some Cisco equipment over the Fast and Gigabit Ethernet links. It is offered as an alternative to the IEEE 802.1Q standard, a widely used VLAN tagging protocol, although the use of ISL for new sites is deprecated by Cisco.
How do I set up Dot1q encapsulation on a router?
Routers only support Dot1Q encapsulation. Now we configure the router’s Fa0/1 interface to act as a trunk. First, we remove the ip address on the physical interface. Next, we configure a subinterface for each VLAN the link will be a trunk for. The interface number can be anything you want.
Is there a switchport trunk encapsulation Dot1q CLI for 2960?
2960 will not allow “switchport trunk encapsulation dot1q” CLI. Newer devices don’t support ISL so you can only run 802.1Q. That means that there is no need for an encapsulation command because only one encapsulation is supported. If the device had support for ISL then you would also have that command.
What is Dot1q Dot1q in Cisco switch?
Encapsulation Dot1Q. Use. Allows you to use a router interface as a trunk port to a switch. This is also known as “Router on a stick” because the switch uses the router to route between VLANs. Syntax. Router(config-subif)#encapsulation dot1Q Option
What is the use of encapsulation type in Linux?
This command sets the encapsulation type for an interface. This is the default encapsulation, it provides a simple serial link. This enables ppp on the link, it provides link authentication and many other features. This enables frame-relay on a serial link. This encapsulation enables trunking on a ethernet link.