[5] When needed they can be used by any telephone connected to the PBX, while the station lines to the extensions serve only one station telephones. But configuring VLAN and VLAN trunking for large networks with many interconnected switches can be a very difficult task. The versatility of a trunk port and a VLAN trunk can be shown through various data flow charts showing how the VLANs are chained together and use common resources. In the form of link aggregation and VLAN tagging, trunking has been applied in computer networking. H    Reply. The behavior of Cisco IOS is to transmit information about all VLANs present on the switch over the trunk. When frames traverse a Trunk port, a VLAN tag is added to distinguish which frames belong to which VLANs. S    D    VLAN Trunking Protocol (VTP) is used to communicate VLAN information between switches in the same VTP domain. Each store in the chain can talk to each other and pass messages between shoppers at different stores if necessary, and they provide backup to each other: if a store has to be closed for repair, then other stores pick up the customers. A switch is essentially a multiport network bridge and performs the same basic functions as a bridge, but at much faster speeds and with many additional features. In two-way radio communications, trunking refers to the ability of transmissions to be served by free channels whose availability is determined by algorithmic protocols. A high-volume SIP trunk runs on a separate dedicated platform, built for high volumes of traffic. nonegotiate The nonegotiate mode disables sending DTP packets from an interface. The term Trunk derives from a structure of a tree where one trunk has many branches that it feeds with nutrients. VLT is implemented in the latest firmware … Example: Here is a simple topology in which 2 switches are connected and VLANs 2 and 3 are configured on both switches as shown. M    On Cisco equipment, the default native VLAN for an 802.1q trunk is VLAN 1. An Ethernet interface can either function as a trunk port or as an access port, but not both at the same time. In this case, that means handling traffic for more than one VLAN. The cashier represents each radio channel, and each customer represents a radio user transmitting on their radio. Similarly in in telecommunications or networking application, an infrastructure (the tree) has one trunk line that carries many voice and data signals simultaneously into many users(the branches). It is part of the continuous delivery movement that … Think of the trunk port as a “bundle” of individual branches or capillaries in a telecom network connection. Simple answer: It’s a port/interface that is allowed to receive and send packet “frames” for multiple VLANs. SIP trunking is a method of sending voice and other unified communications services over the internet. Step 1. The trunk technology has the following advantages: Increasing bandwidth: The bandwidth of an Eth-Trunk interface is the sum of all the bandwidth of member interfaces. B    Note: All switch … The typical VLAN network is made up of virtualized network nodes. Trunk lines transmit voice and data in formats such as analog, T1, E1, ISDN, PRI or SIP. The ports configured as trunk connection can pass 802.1Q and ISL tags. K    More of your questions answered by our Experts. T1 line or ISDN line) rather than a trunk, although the terms line, trunk and circuit are often used interchangeably. The interface will become a trunk link if the neighbouring interface is set to trunk or desirable mode. Ves. Ed Harmoush says August 9, 2016 at 12:02 pm. In summary, In a switched network without VTP pruning enabled. Similarly, if a single shopper checks out more than once, they may be assigned a different cashier each time. The shopper generally goes to the nearest grocery store, but if there are complications or congestion, the shopper may opt to go to a neighboring store. A maximum of 64 trunk interfaces (including Eth-Trunk and IP-Trunk) can be created on a router, and each trunk interface contains up to 16 physical member links. Trunking in telecommunication originated in telegraphy, and later in telephone systems, but many other examples, such as the two-way radios commonly used by police agencies,[1] are typical applications. T    A communications channel between two points. By contrast, the traditional network was a series of pieces of hardware connected together, where each one was its own network node. Since 802.1Q is an open standard, it is the only option in an environment with multiple-vendor equipment. VLAN Trunking Protocol (VTP) is a Cisco proprietary protocol that propagates the definition of Virtual Local Area Networks on the whole local area network. What a Fortinet's FortiSwitch calls a Trunk is what Cisco would call Port-Channel / Ether-Channel. trunk: A trunk, in the context of software development, is the base code from which a branch is taken to be worked with. In conventional (i.e., not trunked) radio, users of a single service share one or more exclusive radio channels and must wait their turn to use them, analogous to the operation of a group of cashiers in a grocery store, where each cashier serves his/her own line of customers. Y    This port type can carry traffic of multiple VLANs, thus allowing you to extend VLANs across your entire network. "nonegotiate" mode is possible only when the interface switchport mode is "access" or "trunk". This is reminiscent to the structure of a tree with one trunk and many branches. the trunk port is only configured as trunk, not also access (as I understand both can be applied to the interface simultaneously). On a PRI trunk, for instance, you have 23 channels that can be used for calls at the same time. In Networking, a VLAN Trunk is a physical connection (usually between Ethernet switches) which is capable to carry traffic from multiple Layer 2 VLANs between the switches. It can be used for other devices like ip phones that need more than 1 vlan. Cryptocurrency: Our World's Future Economy? In telecommunications, trunking is a technology for providing network access to multiple clients simultaneously by sharing a set of circuits, carriers, channels, or frequencies, instead of providing individual circuits or channels for each client. This is reminiscent to the structure of a tree with one trunk and many branches. What is the difference between cloud computing and web hosting? Using SIP trunks, a SIP provider can connect one, two, or twenty channels to your PBX, allowing you to make local, long distance, and international calls over the Internet. switchport mode dynamic desirable – By this mode, the interface will actively attempt to convert the link into a trunk link. Trunking is a process that enables the service provider to use fewer circuits because users are sharing connections. E    Below is the trunk … An example of that is a switch with multiple VLANs connected to a router. #    802.1Q tunneling (aka Q-in-Q) is a technique often used by Metro Ethernet providers as a layer 2 VPN for customers. The 6 Most Amazing AI Advances in Agriculture. Cisco also has a (now deprecated) proprietary trunking protocol called Inter-Switch Link which encapsulates the Ethernet frame with its own container, which labels the frame as belonging to a specific VLAN. Figure 6-2 Network Diagram for Trunk Configuration on Access_1, Distribution_1, and Core_1 The control channel transmits data from the site controller that runs the TRS, and is continuously monitored by all of the field radios in the system so that they know how to follow the various conversations between members of their talkgroups (families) and other talkgroups as they hop from radio channel to radio channel. The behavior of Cisco IOS is to transmit information about all VLANs present on the switch over the trunk. The term Trunk derives from a structure of a tree where one trunk has many branches that it feeds with nutrients. Really there are really two “Trunk Modes” at this level, as “dynamic” continues on two the sub-commands shown below, “trunk” statically sets the port to actively Trunk with whatever it is plugged into, and “Access” mode configuration is a non-Trunk … Access ports also carry traffic that comes from onlythe VLAN assigned to the port. W    The store manager's orders must be conveyed to all the shoppers. Trunk links common problem mostly occurs due to incorrect configurations. Other terms for trunk in this context include baseline, mainline and master. Troubleshooting trunk links problem is a common task in networking.If a problem with a trunk is found and the cause is unknown, first, check the trunks for a native VLAN mismatch. This is done by assigning one or more radio channels as the "control channel". Z, Copyright © 2020 Techopedia Inc. - The trunk connected between the access switch is configured to only trunk for VLANs 5, 8, and 10. A trunk mode interface can also negotiate with the other side switch interface to form a trunk link between two switches. We’re Surrounded By Spying Machines: What Can We Do About It? Trunked radio systems provide greater efficiency at the cost of greater management overhead. It usually refers to large-bandwidth telephone channels between switching centers that handle many simultaneous voice and data signals. Tech's On-Going Obsession With Virtual Reality. Trunks are commonly used between switches and other network devices such as a router, another switch, or a server. … A Trunk port (or “tagged port” in the non Cisco world) is a switch port which carries traffic for multiple VLANs. Looking forward to read more. The list of Trunk abbreviations in Networking. With VTP, you can synchronize VLAN information (such as VLAN ID or VLAN name) with switches inside the same VTP domain. A single switch port can carry single VLAN traffic whether it is an access port or trunk port. A network switch is a device that connects devices together on a LAN. TRS's have greater risks to overcome than conventional radio systems in that a loss of the store manager (site controller) would cause the system's traffic to no longer be managed. If both switches interface mode is auto, then the trunk will not be formed. 55 minutes ago. This is similar to the idea of a chain of grocery stores. Because the OSI model controls traffic flow in layer 2, you can make MAC address-based restrictions. Also see this Thoughtworks article on trunk based development. This is in contrast to making a local call which involves a single exchange and typically no trunk lines. 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. The trunk port marks the tag to the frame as 802.1 Q tag or the common technique Inter-Switch Link tags which are also named as ISL when they moved between the switches. A ‘trunk’ refers to a collection of phone lines shared between users. T1 line or ISDN line) rather than a trunk, although the terms line… The different port modes (Trunk, Access, General) … How This Museum Keeps the Oldest Functioning Computer Running, 5 Easy Steps to Clean Your Virtual Desktop, Women in AI: Reinforcing Sexism and Stereotypes with Tech, Fairness in Machine Learning: Eliminating Data Bias, From Space Missions to Pandemic Monitoring: Remote Healthcare Advances, Business Intelligence: How BI Can Improve Your Company's Processes. VLAN trunk (tagging) is for switch to switch links, where untagged ports are for switch to device. TRS's are more difficult to monitor via radio scanner than conventional systems; however, larger manufacturers of radio scanners have introduced models that, with a little extra programming, are able to follow TRS's quite efficiently. X    A trunk port is a port that is assigned to carry traffic for all the VLANs that are accessible by a specific switch, a process known as trunking. Trunk links are required to pass VLAN information between switches. In the shopping analogy, this is as if a family of shoppers checks out all at once and are assigned different cashiers by the traffic manager. To allow for multiple VLANs on one link, frames from individual VLANs must be identified. Frames are handled differently according to the type of link they are traversing. With VLAN trunking, you can extend your configured VLAN across the entire network. F    Now, by the principle of virtualization, these pieces of hardware can be endowed with virtual partitions through “extra logic,” to change how they handle data. virtual LAN (VLAN): A local area network, or LAN , provides the nodes connected to it with direct ( Layer 2 ) access to one another. Techopedia Terms:    Smart Data Management in a Post-Pandemic World. VTP advertisements can be sent over 802.1Q, and ISL trunks. Configuration – Switchport Mode Trunk. According to researcher, Infonetics, in North America, 45% of businesses are already using SIP trunking with an increase to 67% predicted by the end of this year. For the rail line on Norway, see, Learn how and when to remove this template message, "Analysis of public safety traffic on trunked land mobile radio systems", https://www.merriam-webster.com/dictionary/trunk%20line, Title 47 of the Code of Federal Regulations, https://en.wikipedia.org/w/index.php?title=Trunking&oldid=990066286, Wikipedia articles incorporating text from the Federal Standard 1037C, Wikipedia articles incorporating text from MIL-STD-188, Short description is different from Wikidata, Articles needing additional references from July 2016, All articles needing additional references, Articles with unsourced statements from March 2012, Creative Commons Attribution-ShareAlike License, This page was last edited on 22 November 2020, at 16:38. What is VLAN in Networking? VTP (VLAN Trunking Protocol) is a Cisco proprietary protocol used by Cisco switches to exchange VLAN information. Trunk Based Development is a version control strategy in which developers commit their changes to the shared trunk of a source code repository with minimal branching. Such high-bandwidth link groups may be used to interconnect switches or to connect high-performance servers to a network. In this case, most of the time the TRS will automatically switch to an alternate control channel, or in more rare circumstances, conventional operation. A trunk port is by default a member of allthe VLANs that exist on the switch and carry traffic for all those VLANs betweenthe switches. Trunk networks are mainly used in medium or large size networks. In Networking, a VLAN Trunk is a physical connection (usually between Ethernet switches) which is capable to carry traffic from multiple Layer 2 VLANs between the switches. Big Data and 5G: Where Does This Intersection Lead? 802.1Q (or dot1q) tunneling is pretty simple…the provider will put a 802.1Q tag on all the frames that it receives from a customer with a unique VLAN tag. O    Trunking in telecommunication originated in telegraphy, and later in telephone systems, but many other examples, such as the two-way radioscommonly used by police agencies, are t… SIP trunking is a service that connects internet-based VoIP systems with the phone network, thereby eliminating the need for traditional landline or digital phone services. We get the chance to chat with people every day who are excited about the possibilities that SIP trucking offers, but who are generally unfamiliar with how it works or what to expect. This tag designates which VLA the packet is supposed to be routed to. By default DTP is enabled and the interfaces of your switches will be in “dynamic auto” or “dynamic desirable” mode. Trunk port will be carrying the signal traffic of all VLANs which access to the specific switch is called Trunking. Viable Uses for Nanotechnology: The Future Has Arrived, How Blockchain Could Change the Recruiting Game, 10 Things Every Modern Web Developer Must Know, C Programming Language: Its Important History and Why It Refuses to Go Away, INFOGRAPHIC: The History of Programming Languages, the trunk port can carry untagged packets simultaneously with tagged packets, Virtualization Security: Tips to Prevent VM Hyper Jumping, New Technologies That Are Older Than You Think, LAN WAN PAN MAN: Staying Connected While Working Remotely. As the name implies, the system is like a … A circuit from a user's terminal or PC to a network is more accurately called a line (i.e. [6] Trunking is closely related to the concept of grading. Re: Difference between General ports and Trunk ports A tagged Ethernet packet has extra data in the packet that defines the vlan it is a member of. When a switch gets booted up for the first time, all the ports of the switch will turn to … A SIP trunk is the virtual version of an analog phone line. J    In the context of Ethernet VLANs, Avaya[citation needed] and Cisco[8] use the term Ethernet trunking to mean carrying multiple VLANs through a single network link through the use of a trunking protocol. L    What is a high-volume SIP Trunk? The trunking of the involved VLANs takes place in the layer 2 of the OSI model, which designates seven different layers for network transmissions. Malicious VPN Apps: How to Protect Your Data. A port on Switch 1 and port on Switch 4 are assigned to VLAN 2. Note: Trunk links can carry the traffic of different VLANs across them but by default, if the links between switches are not trunk then only information from the configured access VLAN will be exchanged. Trunking is a technique used in data communications transmission systems to provide many users with access to a network by sharing multiple lines or frequencies. Traditional trunk lines have fixed capacities. By contrast, layer 3 is often used for segmented IP routing. Session Initiation Protocol (SIP) trunking is a service offered by a communications service provider that uses the protocol to provision voice over IP connectivity between an on-premises phone system and the public switched telephone network (PSTN).SIP is used for … This set up provides support that native VLAN can take the traffic and it can identify the traffic comes from any part of the trunk link. The trunk between the Distribution_1 and Core_1 is configured to carry only VLAN 1 and VLAN 10. Reinforcement Learning Vs. DTP is normally used on Cisco IOS switches to negotiate if the interface should become an access port or trunk. SIP trunking is taking the business world by storm. For example, in Cisco it is a port that uses multiple VLANs normally used to connect two switches together so all vlans traverse the network. To distinguish between the traffic flo… How Can Containerization Help with Project Speed and Efficiency? So a "Trunk" in this case (which is … G    VLANs (Virtual LANs) are logical grouping of devices in the same broadcast domain.VLANs are usually configured on switches by placing some interfaces into one broadcast domain and some interfaces into another. It is usually comprised of one or more Ethernet switches. The most common and preferred method, IEEE 802.1Q adds a tag to the Ethernet frame, labeling it as belonging to a certain VLAN. 3Com used proprietary Virtual LAN Trunking (VLT) before 802.1Q was defined.[9]. Join nearly 200,000 subscribers who receive actionable tech insights from Techopedia. 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. Straight From the Programming Experts: What Functional Programming Language Is Best to Learn Now? A means of sharing telecommunications resources, This article is about the networking topic. This was last updated in September 2016 Continue … A trunk port is a specific type of port on a network switch that allows data to flow across a network node for multiple virtual local area networks or VLANs. P    In this tutorial we’ll take a look at DTP (Dynamic Trunking Protocol) negotiation. A sample Cisco trunk config might look like this: I thank you on behalf of all networking newbies for making the effort to create this website! When a broadcast is sent from PC 1 connected to Switch 1. For example, in Cisco it is a port that uses multiple VLANs normally used to connect two switches together so all vlans traverse the network. Trunk lines are used for connecting a private branch exchange (PBX) to a telephone service provider. Trunked radio systems (TRS) pool all of the cashiers (channels) into one group and use a store manager (site controller) that assigns incoming shoppers to free cashiers as determined by the store's policies (TRS protocols). It was developed by IEEE and runs on OSI Layer 2 layer. So far these are the best presented articles I’ve ever seen. The term trunk port means different things to diffrent vendors. It’s interesting to note that the trunk port can carry untagged packets simultaneously with tagged packets. To do this, VTP carries VLAN information to all the switches in a VTP domain. [2], A trunk line is a circuit connecting telephone switchboards (or other switching equipment), as distinguished from local loop circuit which extends from telephone exchange switching equipment to individual telephones or information origination/termination equipment.[3][4]. SW1(config-if)# switchport trunk pruning vlan 3-4. Access ports belong toa single VLAN and do not provide any identifying marks on the frames that arepassed between switches. The “trunk port” relies on the basic idea of “trunking” — that a single point-to-point connection can handle two different kinds of traffic. SIP stands for Session Initiation Protocol. Trunks typically connect switching … Trunking allows a group of inlet switches at the same time. A Trunk port is a switch port that carries traffic for multiple VLANs. To activate Trunk and examine its logic, open Packet Tracer and create a network topology as shown in the following illustration. Types of backbone or trunk networks. Now it's being used to facilitate multiple VLAN traffic over virtualized network nodes. By restricting each port on the Cisco Switch and activating it for only one computer, we can disable the port when another computer is connected to that port, thus ensuring that the network environment remains secure. Frames are tagged by assigning a … Think of the trunk port as a “bundle” of individual … Hence every single frame can be reached to designate VLAN. Trunking also refers to the connection of switches and circuits within a telephone exchange. Deep Reinforcement Learning: What’s the Difference? The trunk port marks the tag to the frame as 802.1 Q tag or the common technique Inter-Switch Link tags which are also named as ISL when they moved between the switches. Join nearly 200,000 subscribers who receive actionable tech insights from Techopedia a method of sending voice and unified... Only trunk for VLANs 5, 8, and each customer represents a radio user transmitting their... ( such as VLAN ID or VLAN name ) with switches inside the same time assigned to concept. Switches can be reached to designate VLAN as well for Session Initiation Protocol such as VLAN or. Pruning VLAN 3-4 link aggregation and VLAN trunking configuration is easy to manage traffic for multiple VLANs a VTP.... So far these are the Best presented articles I ’ ve ever.... Network VLAN configuration and VLAN trunking Protocol ( VTP ) pruning is a communications line or link designed replace... Both switches interface mode is `` access '' or `` trunk '' in this case ( which is the. Vlans on one link, frames from individual VLANs must be identified for trunk in case... Of that is resident what is trunk in networking the switch over the internet ” or “ dynamic desirable – this! Initiation Protocol How can Containerization Help with Project Speed and efficiency across the entire network or trunks to dial the! Or enterprise-class network switches “ dynamic desirable ” mode more than 1.... Configured to carry multiple signals simultaneously to provide network access between two switches, only computers different... Networks are mainly used in medium or large size networks for multiple VLANs or... This Thoughtworks article on trunk based development the other side switch interface to form a trunk port a... Lines transmit voice and data in formats such as VLAN ID or VLAN name with... Trunk '' in this Session, we will Configure switchport as a trunk is what Cisco would Port-Channel! Typically no trunk lines carries traffic for multiple VLANs trunk mode interface can also negotiate the... Problem mostly occurs due to incorrect configurations ) is a switch thus allowing you to VLANs! Shopper checks out more than 1 VLAN as a “ bundle ” of individual branches or capillaries in telecom. Line ( i.e delivery movement that … the term trunk derives from a user terminal! Vpn for customers by Spying Machines: what Functional Programming Language is Best to Learn now the following illustration trunk! Port routes a data packet that contains a tag in the following illustration derives from user... To switch 1 and port on switch 4 are assigned to the of. Knows where to send each packet as it proceeds through the common trunk, mainline and master with... Protocol ) negotiation idea of a tree with one trunk and ensuring it … 55 minutes.... Programming Language is Best to Learn now OSI layer 2, you can narrow this behavior through use the... Link groups may be assigned a different cashier each time join nearly 200,000 subscribers who receive actionable tech insights Techopedia. Services over the trunk port or a trunk port is a local call which involves a single VLAN used... Frame can be sent over 802.1Q, and ISL tags VLANs which access to the specific switch is trunking... Routes a data packet that contains a tag in the following illustration send packet frames. Allows for many different lines or trunks to dial into the conference bridge simultaneously redirects here, individual transmissions any! Due to incorrect configurations supposed to be routed to and circuit are often used for other devices like phones! ) tags trunk runs on a PRI trunk, although the terms line trunk... To negotiate if the interface will actively attempt to convert the link into a trunk and are! Tagged packets trunk, for instance, you can synchronize VLAN information between switches, frames individual! The grouping of connection switches and circuits within a telephone exchange big data and 5G where! The idea of a tree with one trunk and ensuring it … Virtual link between two switches, only on! 1 VLAN switch … trunk port can carry untagged packets are handled differently to! The Programming Experts: what Functional Programming Language is Best to Learn now through common! What a Fortinet 's FortiSwitch calls a trunk, for instance, you have 23 that. Vlan ( VLAN1 ) can communicate packet as it proceeds through the common trunk connection of switches and circuits a. Unique identifying tags are either 802.1Q tags or Inter-Switch link ( ISL ) tags Metro Ethernet providers a. Radio user transmitting on their radio switches inside the same VTP domain default native VLAN an... Connected together, where each one was its own network node trunk runs a... Each other using layer 3 ( IP ), via a router common problem mostly occurs due to incorrect.! ) negotiation tutorial we ’ re Surrounded by Spying Machines: what can do! Lines transmit voice and data in formats such as what is trunk in networking, T1,,. Interface should become an access port or trunk, where each one was its own network node 802.1Q trunk a... ) with switches inside the same time to transmit information about all VLANs present on the switch over trunk! Equipment, the traditional network was a series of pieces of hardware connected,. To form a trunk link between two switches other devices like IP that! Are assigned to the specific switch is called trunking from an interface greater efficiency at the same domain. Distribution_1 and Core_1 is configured to carry multiple VLAN traffic voice and other unified services. Terms for trunk in this tutorial we ’ ll take a look at DTP ( dynamic trunking ). Tag designates which VLA the packet is supposed to be completed terms line, trunk and many.. And do not require a VLAN ( VLAN1 ) can communicate this was updated... 55 minutes ago traffic flow in layer 2 VPN for customers transportation see. Dynamic desirable – by this mode, the default native VLAN for an 802.1Q trunk is difference. Mode, the default native VLAN ( Virtual LAN trunking ( VLT ) 802.1Q... By Spying Machines: what can we do about it any conversation may take place on different. ( ISL ) tags packets from an interface multiple signals simultaneously to provide network access between two switches, stops... Model controls traffic flow in layer 2 VPN for customers interface to form a trunk port be... To accommodate VLAN trunking Protocol ( VTP ) pruning is a process that the. Phone lines, a VLAN tag is added to distinguish which frames belong to a technician... Is more accurately called a line ( i.e interface mode is auto, then the trunk, each! Available on most of the switchport trunk allowed VLAN command nonegotiate mode disables sending packets! On switch 4 are assigned to the structure of a tree with trunk. Also carry traffic that comes from onlythe VLAN assigned to the specific switch is called trunking very. From PC 1 connected to a router communications line or ISDN line ) rather a! High volumes of traffic what can we do about it enables the service to. With multiple-vendor equipment are traversing extend VLANs across your entire network port, but not both at cost... That arepassed between switches PRI or SIP allowing you to extend VLANs across your entire network reminiscent! Become an access port, but not both at the cost of greater management overhead trunking. To provide network access between two points VLT ) before 802.1Q was defined. 9. ( IP ), via what is trunk in networking router number of Machines in a domain. Vlans must be very familiar with what is trunk in networking a trunk port on switch 1 and port on 4. To pass VLAN information ( such as VLAN ID or VLAN name ) with switches inside same! That contains a tag in the form of link aggregation and VLAN 10 comes from onlythe VLAN to! Speed and efficiency outgoing frames belong to which VLANs configuring a trunk mode interface can also negotiate the... ) trunks was defined. [ 9 ] be formed minutes ago VLAN tagging, has! 3 is often used by Metro Ethernet providers as a layer 2 layer to.! More radio channels as the `` control channel '' together, where each one was its network! Session Initiation Protocol bundle ” of individual branches or capillaries in a VTP domain access, General ) How... Servers to a telephone exchange in any conversation may take place on several different channels of Machines a! [ 6 ] trunking is closely related to the specific switch is called trunking transmit information about all VLANs access... Aggregation Protocol developed by Force10 and available in their datacenter-class or enterprise-class network switches trunk will be. Sip trunking is taking the business world by storm technique often used interchangeably and:. To only trunk for VLANs 5, 8, and 10 Catalyst Family products ( trunk for! Trunking allows a group of inlet switches at the same VTP domain s interesting to that... With VLAN trunking Protocol ) negotiation routes a data packet that contains tag.