What is encapsulation dot1q router?

What is encapsulation dot1q router?

Step 2. 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 the purpose of the encapsulation dot1q command?

Summary of Commands switchport trunk encapsulation dot1q sets the encapsulation mode of the trunk interface to the industry standard 802.1Q. switchport trunk encapsulation isl sets the encapsulation mode of the trunk interface to proprietary ISL.

What is dot1q native VLAN?

The IEEE 802.1Q trunking protocol describes something called the native VLAN. When your Cisco switches receive an Ethernet frame without a tag on an 802.1Q enabled interface, it will assume that it belongs to the native VLAN. For this reason, you need to make sure that the native VLAN is the same on both sides.

What is Switchport 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 is ISL and DOT1Q?

ISL and DOT1Q are 2 encapsulation standards supporting Virtual LANs (VLANs) on an Ethernet network. These are the 2 frame tagging protocols that Cisco supports. The tagging protocol can be manually specified on a trunk port, or dynamically negotiated using Cisco’s proprietary Dynamic Trunking Protocol (DTP).

Should I turn on VLAN?

VLANs provide an excellent and low cost method of greatly improving you home network security and should be considered if you share your network with guests, and or have IOT devices connected to your Network.

How does router on a stick work?

ROUTER-ON-A-STICK, also known as a “one-armed router” is a method for running multiple VLANs over a single connection in order to provide inter-VLAN routing without the need of a Layer 3 switch. Essentially the router connects to a core switch with a single interface and acts as the relay point between networks.

What is a trunk native VLAN?

A native VLAN is a special VLAN whose traffic traverses on the 802.1Q trunk without any VLAN tag. A native VLAN is defined in 802.1Q (it supports untagged traffic while inter-switch link doesn’t support untagged traffic.)

Should native VLAN be allowed on trunk?

Cisco recommends not using VLAN 1, restricting VLAN 1 from trunk links ( switchport trunk allowed command), and not using a native VLAN on the trunks, meaning that all the VLANs on a trunk would be tagged, and there would be no VLAN 1 frames.

What is port encapsulation?

A trunk is a point-to-point link between two network devices that carry more than one VLAN. As a result, the switches with trunk ports add tags to the frames for identification – a process typically known as VLAN Encapsulation.

What is Switchport trunk native VLAN?

The switchport trunk native vlan command specifies the native (untagged) VLAN for a Layer 2 interface operating in trunk mode on a Cisco IOS device. This command only takes effect for interfaces that are operating in trunk mode.

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