What is DOT1Q native VLAN?
What is DOT1Q native VLAN?
The IEEE 802.1Q trunking protocol describes something called the native VLAN. All native VLAN traffic is untagged; it doesn’t have an 802.1Q tag on the Ethernet frame. 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.
What is encapsulation DOT1Q in networking?
What is 802.1Q Encapsulation? 802.1Q is the networking standard that defines virtual LANs (VLANs) on an Ethernet network. VLANs are logical networks that share a single physical connection using 802.1Q tagged frames.
What does Switchport trunk encapsulation DOT1Q do?
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 the most common cause of errors in the implementation of inter VLAN routing?
Another issue for inter-VLAN routing includes misconfigured switch ports. In a legacy inter-VLAN solution, this could be caused when the connecting router port is not assigned to the correct VLAN. However, with a router-on-a-stick solution, the most common cause is a misconfigured trunk port.
What is native VLAN on trunk port?
A Trunk port (or “tagged port” in the non Cisco world) is a switch port which carries traffic for multiple VLANs. When frames traverse a Trunk port, a VLAN tag is added to distinguish which frames belong to which VLANs. The Native VLAN is simply the one VLAN which traverses a Trunk port without a VLAN tag.
What is trunk native VLAN?
Native VLAN: The native VLAN is the one into which untagged traffic will be put when it’s received on a trunk port. This makes it possible for your VLAN to support legacy devices or devices that don’t tag their traffic like some wireless access points and simply network attached devices.
What is the purpose of the native VLAN in 802 Q trunking?
VLANs keep traffic from different networks separated when traversing shared links and devices within a topology. This process, also known as VLAN tagging, is invaluable to limiting broadcast network traffic and securing network segments.
What is inter-VLAN routing?
Definition. Inter-VLAN routing can be defined as a way to forward traffic between different VLAN by implementing a router in the network. The user nodes in the VLANs forwards traffic to the router which then forwards the traffic to the destination network regardless of the VLAN configured on the switch.
What does Switchport trunk native VLAN do?
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.
How does Inter VLAN routing work?
Inter-VLAN routing can be defined as a way to forward traffic between different VLAN by implementing a router in the network. The user nodes in the VLANs forwards traffic to the router which then forwards the traffic to the destination network regardless of the VLAN configured on the switch.
What is a disadvantage of using router on a stick inter VLAN routing?
The disadvantages to a Router on a Stick Network are: It is more complex to set up compared to other networks. Traffic between VLANs goes into the router and out of the router through the same port. The trunk is a major source of congestion.
How do you troubleshoot a VLAN problem?
How to Troubleshoot a VLAN Configuration
- The first thing you need to do is to make sure that your cable and switch port are good.
- Next, check your switche’s interface configuration.
- If two hosts cannot communicate then check whether they are in the same VLAN.
What is the number 10 in the encapsulation Dot1q 10 Native router subinterface?
8. What is the meaning of the number 10 in the encapsulation dot1Q 10 native router subinterface command? Explanation: The administrator can use the encapsulation command to specify the encapsulation type (IEEE 802.1Q or ISL), the VLAN ID, and optionally the native VLAN.
What is needed to enable communication between VLANs on legacy inter-VLAN routing?
A small college uses VLAN 10 for the classroom network and VLAN 20 for the office network. What is needed to enable communication between these two VLANs while using legacy inter-VLAN routing? Two groups of switches are needed, each with ports that are configured for one VLAN. A router with at least two LAN interfaces should be used.
Is native VLAN required to tag all VLANs?
If you platform does not have the configuration option to tag all VLANs, you assign the Native VLAN to a bogus VLAN like 999, all other VLANs with traffic will be tagged. 06-17-2002 10:54 PM 06-17-2002 10:54 PM Native VLAN is required.
How do I configure Packet Tracer for Inter-VLAN routing?
PACKET TRACER—CONFIGURE ROUTER-ON-A-STICK INTER-VLAN ROUTING (4.2.7) In this Packet Tracer activity, you check for connectivity prior to implementing inter-VLAN routing. Then you configure VLANs and inter-VLAN routing. Finally, you enable trunking and verify connectivity between VLANs.
