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Continued use of the site after the effective date of a posted revision evidences acceptance. Please contact us if you have questions or concerns about the Privacy Notice or any objection to any revisions. All rights reserved. Cisco Press. Join Sign In. Sample Chapter is provided courtesy of Cisco Press. Date: Oct 25, Trunk links provide VLAN identification for frames traveling between switches.
Certain types of switches can negotiate trunk links. Trunk links must be configured to allow trunking on each end of the link. To enable trunking between the switches, use the following steps: Enable trunking on a port. TIP It is important to remember that not all switches support DTP and might not establish a trunk without intervention. NOTE When enabling trunking, it is not possible to specify a range of ports. NOTE Not all switches allow you to negotiate a trunk encapsulation setting.
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Customer Service We communicate with users on a regular basis to provide requested services and in regard to issues relating to their account we reply via email or phone in accordance with the users' wishes when a user submits their information through our Contact Us form. Trunking as a concept was popularized in PBX and VoIP with SIP trunking and other telecom innovations to allow a single gateway to deliver data and voice to multiple individual user endpoints.
Now it's being used to facilitate multiple VLAN traffic over virtualized network nodes. The trunking of the involved VLANs takes place in the layer 2 of the OSI model, which designates seven different layers for network transmissions. Layer 2 is known as the "data link layer" and is typically used for MAC broadcasting and signaling between nodes of an internal network. By contrast, layer 3 is often used for segmented IP routing. The basic way to look at this is that layer 2 is much more geared toward internal network activities, where layer 3 utilizes the IP system in a more external way.
In order to accommodate VLAN trunking, the trunk port routes a data packet that contains a tag in the frame header. This tag designates which VLA the packet is supposed to be routed to. This is the fundamental way that the system knows where to send each packet as it proceeds through the common trunk. These unique identifying tags are either This has been a guide to What is a Trunk Port?
Here we discuss the introduction, trunking mechanism, and why trunking is important to configure with VLAN? You may also have a look at the following articles to learn more-. Submit Next Question. By signing up, you agree to our Terms of Use and Privacy Policy. Forgot Password? This website or its third-party tools use cookies, which are necessary to its functioning and required to achieve the purposes illustrated in the cookie policy.
By closing this banner, scrolling this page, clicking a link or continuing to browse otherwise, you agree to our Privacy Policy. What is a Trunk Port? Popular Course in this category. Course Price View Course. Should they miscable it and connect it to another access-switch, hopefully other security mechanisms protects against that but it would not form a trunk where it's not supposed to trunk.
Like access-switch to access-switch, access-switch to servers, access-switch to end-hosts etc. Best practices are more if you want to learn how it's the best and recommended way of implementing things - there will always be deviations from those.
Appreciate your input. I will be starting icnd2 study and probably will learn those dtp more as I go through my journey to ccna. It sucks our barnes and noble does not have it stock so I will have to order it online oh well I will just wait. I don't mean to get this thread turn in aside of other topics. 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. View This Post. Edited by Admin February 16, at AM. Understanding Trunk Port. I'm having some problems to understand Trunk Port. I created a topology: Router1 has three Subinterfaces, encapsulated with dot1Q. Best Regards, Thiago. PC 8 - Hi Thiago, Chuck is already helping you with your questions so i don't want to budge in. Those are the implementation requirements.
Now about your questions. Short and correct answer: Yes. Otherwise packets More detailed answer and explanation: No. What do you mean by encapsulate? Hi again Thiago, Yeah! I'm glad you got it working. Although i just put it as a "distribution switch" since it's technically aggregating the traffic from Switch 5 and Switch 7 up towards the router A distribution switch in general attaches to at least one core-switch.
You are correct. There are perfectly valid reasons for it, and the best practice implementation is: Use VTP in Transparent mode Simply put, because of how it works. Or in a router with an ethernet-module. If it's a layer 2 switch that can't do ip-routing of any sort, then you just need this command: switchport mode trunk Since it can't do any routing. The router uses this command: encapsulation dot1q encapsulation isl -HTH. Hi, Daniel 3 Chuck said: "On those trunk interface you can do and do same to the others as well.
When switch 6 distributes the frames out of access ports, they are untagged and can be received by the end points Correct. Thiago, If the links are in access-vlan 2 and 4 , does traffic not travel tagged? Access-ports deals with untagged frames.
Thiago wrote: If one switch receives a tagged packet of some VLAN that it doesn't have, Why does it discard this packet? Thiago wrote: Is necessary to encapsulate a Switch Port? Assuming you are referring to the below command switchport trunk encapsulation dot1q It is necessary because without it the switch will not know how to package the packet before forwarding it. Hi chuck, I am still learning so I went ahead and tried re-creating what you have on your topology and having all vlans on your core switch able to pign all host.
Remember that if you issue this command: show interfaces trunk It will list that all VLAN's are allowed to cross the trunk. So sorry about that confusion! Chuck wrote: I just removed vlan 3 and 4 on SWCnt and ping from Hi again Chuck, Correct.
Can you figure it out? You are on the right track. What makes a VLAN active? Hi again Chuck, No. That's not a recommended way of doing it. It will work in this topology. Your welcome. Yes your first configuration was the best one. There are always a "best configuration" to use.
That said, your first example was the best one.
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