Dot1q encapsulation native vlan

Which VLAN will that be? Well which VLAN do our ports belong to by default? VLAN 1. So by default, we're only passing traffic for one VLAN. But we run into a problem now when we connect two switches together. If I connect two switches together and I want to pass traffic for multiple VLANs across that one single link, how do we do it? Well we need to trunk those switches together. We'll change our encapsulation really. We'll change the language that we speak across that link just a little bit and we'll further identify the VLAN for the frames that traverse that link.

That's a trunk, okay?

Encapsulation Dot1Q Command on CISCO Router/Switch

Now if you're struggling with this, I want you to think about the challenge - a link, by default, is an access link and it lacks this trunking mechanism. So think about the fact that multiple switches will generally be part of the broadcast domain that the VLAN lives in and we're going to have potentially hundreds of VLANs in one given space. Certainly, it's quite common to see 15 to 50 VLANs in a common space to the access layer.

So now we have a really big challenge.

dot1q encapsulation native vlan

We might have a gigabit link or a 10 Gb link between our switches, and carrying one VLAN isn't sufficient, is it? We still might have a bottleneck, but the VLANs can then flow. So this is a big deal, isn't it?

And we have to think to ourselves, okay, switch-to-switch connections should probably be trunk links, right? Also, switch to multilayer switch or switch to router, because those devices would have to terminate and route for the different VLANs. So all things being equal, when I look at a topology, I think all the links that are going down to PCs, those are going to be access ports, they're not going to be trunks. And then, the links between my switches, those I'm going to make trunks.

This trunk link has to keep track of which VLAN that traffic belongs to, so it's going to be tagging. But is every single VLAN tagged when we send traffic over that trunk?

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There is an exception to every rule, right? At least, that's very true here. The trunking protocol that we use in modern day Cisco is If you change it, make sure you change it on both sides of the trunk link and it, in fact, is a security challenge, so we choose to change it often to 99 or So one of the 4, VLANs that could flow, one of them is untagged.IEEE The standard defines a system of VLAN tagging for Ethernet frames and the accompanying procedures to be used by bridges and switches in handling such frames.

The standard also contains provisions for a quality-of-service prioritization scheme commonly known as IEEE Portions of the network which are VLAN-aware i.

The standard was developed by IEEE One of the notable revisions is Under This allows to easily pop a tag without additional padding. For frames other than For Because inserting the VLAN tag changes the frame, The IEEE Some network devices that do not support the larger frame size will process these frames successfully but may report them as "baby giant" anomalies.

In such cases, From Wikipedia, the free encyclopedia. Parts of this article those related to Please update this article to reflect recent events or newly available information. August It is always set to zero for Ethernet. If a frame received at an Ethernet port had a CFI set to 1, then that frame would not be bridged to an untagged port. Cisco Systems.

dot1q encapsulation native vlan

Retrieved IEEE standards. P P P P P Hidden categories: Articles with short description Short description is different from Wikidata Wikipedia articles in need of updating from August All Wikipedia articles in need of updating.The document displays the results of each command as you issue the command. You can use any of these switches in the scenarios in this document to obtain the same results:.

To create the examples in this document, these switches were used in a lab environment with cleared configurations:. The configurations in this document were implemented in an isolated lab environment.

Ensure that you understand the potential impact of any configuration or command on your network. The configurations on all devices were cleared with the clear config all command on the Catalyst switch and write erase command on the Catalyst XL switch to ensure a default configuration.

For more information on document conventions, refer to the Cisco Technical Tips Conventions. Trunking is a way to carry traffic from several VLANs over a point-to-point link between the two devices. Two ways in which you can implement Ethernet trunking are:.

This document creates a trunk that carries traffic from two VLANs across a single link between a Catalyst and a Catalyst switch. Information on how to route between the two VLANs is beyond the scope of this document.

These switches do not support ISL trunking. Use the nonegotiate option for the switchport trunk command on the other side of the trunk link.

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Use of the nonegotiate option prevents the receipt of DTP frames from the peer that the XL switch cannot process. The series does not support ISL trunking.

This support scenario depends on the module. Issue the show port capabilities command to determine the support. The command output explicitly states the trunking capacity. Here is an example:.

Make sure that the trunking modes match across the trunk link. Similarly, if you have configured one side of the link as an In this section, you are presented with the information to configure the features described in this document. Enable trunking with use of ISL or This procedure provides the commands necessary to configure trunking.

Base your choice of command to use on the software that runs on the switch. In this example, you configure VTP mode as transparent. You can also configure the switches as either client or server. You must complete this step on both switches if the VTP mode is transparent, as in the example. Omit this step for CatOS switches.

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In Step 5, you designate a port as trunk and, at the same time, you define the encapsulation. When you enable trunking on the interface with the switchport mode trunk command, you automatically configure There are several options for trunking modes, such as: on, off, auto, desirable, auto, and nonegotiate. For more information on each, refer to the appropriate CatOS software configuration page for the switch product that you are configuring.

In the case of In order to change the native VLAN, issue one of these commands:. Comments in blue italics explain certain commands and steps:. This section provides information that you can use to confirm that your configuration works properly. Certain show commands are supported by the Output Interpreter Tool registered customers onlywhich allows you to view an analysis of show command output. Use this command to check the administrative and operational status of the port.IEEE To locate documentation of other commands that appear in this chapter, use the command reference master index or search online.

To identify the hardware platform or software image information associated with a feature, use the Feature Navigator on Cisco. The IEEE The standard provides only a per-port VLANs solution for untagged frames. For example, assigning untagged frames to VLANs takes into consideration only the port from which they have been received.

This section documents the configuration tasks for each protocol supported with IEEE The basic process is the same, regardless of the protocol being routed. It involves the following tasks:. To configure IEEE The first three sections contain required tasks; the remaining tasks are optional:.

Perform the tasks in the following sections to connect a network of hosts over a simple bridging-access device to a remote access concentrator bridge between IEEE Perform these tasks in the order in which they appear:.

After you enable AppleTalk globally and define the encapsulation format, you need to enable it on the subinterface by specifying the cable range and naming the AppleTalk zone for each interface.

To enable the AppleTalk protocol on the subinterface, use the following commands in interface configuration mode:.

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Perform the tasks described in the following sections in the order in which they appear:. To reenable IP routing if it has been disabled, use the following command in global configuration mode:. Once you have IP routing enabled on the router, you can customize the characteristics to suit your environment. An interface can have one primary IP address. To assign a primary IP address and a network mask to a network interface, use the following command in interface configuration mode:.

A mask identifies the bits that denote the network number in an IP address. When you use the mask to subnet a network, the mask is then referred to as a subnet mask. After you enable NetWare globally and define the VLAN encapsulation format, you may need to enable the subinterface by specifying the NetWare network number. Use this command in interface configuration mode:.

Configuration examples for each protocols are provided in the following sections:. The following examples configures IEEE Contacts Feedback Help Site Map.

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Assigns the AppleTalk cable range and zone for the subinterface. Assigns the AppleTalk zone for the subinterface. Specifies the subinterface the VLAN will use. Sets a primary IP address for an interface. Selects a particular Fast Ethernet interface for configuration.

Assigns each network interface to a bridge group.I have seen one configuration in our office router, its the interface connecting ISP from my branch router. Can somebody show me the topology, how this will work, there is no VLAN configured in this router. How this is going to encapsulate packets directed to ISP. IEEE Your router will simply tag any frame coming off that sub-interface on the way to the SP's router, usingand it will expect all incoming frames to be tagged likewise.

Your router doesn't require any VLAN configuration to do this. It is true that my router interface is directly connecting SP end device. The service provider end device is probably a switch and within that switch the service provider segments customers based on VLAN. Since your router has a sub-interface tagged with that means that the service provider's port is configured as a trunk and the native VLAN of that trunk is other than or they've configured even the native vlan to be tagged.

Either way, your router can tag frames without any local VLANs. Vlan tag is the one configured over the link connecting to ISP. The Vlan has no llink to your internal office network.

Probably your ISP is connecting multiple customers over the same port using vlan tag for customer segregation. If you encounter a technical issue on the site, please open a support case. Communities: Chinese Japanese Korean.

All Rights Reserved. The Cisco Learning Network. Enterprise Certifications Community. View This Post. Edited by Admin February 16, at AM.

Current configuration : bytes! Top Rated Answers. Hi, IEEE Regards, Deepak Kumar. All Answers. That is how a router on a stick design works. Log In to Answer. Related Questions Nothing found. Follow Us. Certifications Help About Us.Trunking is a way to carry traffic from several VLANs over a point-to-point link between the two devices.

Two ways in which Ethernet trunking can be implemented are:. To create the examples in this document, we used the following switches in a lab environment with cleared configurations:. The configurations in this document were implemented in an isolated lab environment. Ensure that you understand the potential impact of any configuration or command on your network before using it. The configurations on all devices were cleared with the write erase command to ensure that they have a default configuration.

For more information on document conventions, refer to the Cisco Technical Tips Conventions. Catalyst and series switches only support For The native VLAN is used for untagged traffic when the port is in While configuring It is a common mistake not to match the native VLANs while configuring Router models with certain network modules may have different minimum Cisco IOS versions.

For a complete list of minimum supported software for any router family, use the Software Advisor registered customers only. To determine the best maintenance release for your Cisco product, search for bugs listed by product component in the Bug Toolkit registered customers only. For a complete list of other feature sets supported in different Cisco IOS versions and on different platforms, use the Download Software area. In this section, you are presented with the information to configure the features described in this document.

Comments between the commands are added in blue italics to explain certain commands and steps. If you are using an earlier version of Cisco IOS, refer to the For workstation1, the default gateway should be For details on how to set the default gateways on the workstations, refer to their respective sections in this document. The bug fix was integrated in the following code versions: You can check the status and a brief description of the bug by using the Bug Toolkit registered customers only and entering the bug ID CSCds For details on how to set the default gateways on the workstations, refer to thei respective sections in this document.

Certain show commands are supported by the Output Interpreter Tool registered customers onlywhich allows you to view an analysis of show command output.

This command is used to check the administrative and operational status of the port. It is also used to make sure that the native VLAN matches on both sides of the trunk. This command is used to verify that the interfaces ports belong to the correct VLAN. The rest are members of VLAN1.

VLAN Trunk Operation and Configuration. Native VLAN

In our example, we have used transparent mode. The correct VTP mode depends on the topology of your network. Contents Introduction. ISL is not supported. VLAN1 already exists by default. Current configuration:! Router configure terminal Enter configuration commands, one per line.

dot1q encapsulation native vlan

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