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A trunk modi es the original frame to carry VLAN information, including a VLAN identi er in the frame
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Cisco s high-end switches, such as the Catalyst 6500s, support both types; however, Cisco s low-end switches support only 8021Q: ISL is being phased out by Cisco This book focuses on the use of the latter trunk method, dot1q
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Trunking methods create the illusion that instead of a single physical connection between the two trunking devices, a separate logical connection exists for each VLAN between them When trunking, the switch adds the source port s VLAN identifier to the frame so that the device (typically a switch) at the other end of the trunk understands what VLAN originated this frame and the destination switch can make intelligent forwarding decisions on not just the destination MAC address, but also the source VLAN identifier Since information is added to the original Ethernet frame, normal NICs will not understand this information and will typically drop the frame Therefore, you need to ensure that when you set up a trunk connection on a switch s interface, the device at the other end also supports the same trunking protocol and has it configured If the device at the other end doesn t understand these modified frames or is not set up for trunking, it will, in most situations, drop them The modification of these frames, commonly called tagging, is done in hardware by application-specific integrated circuits (ASICs) ASICs are specialized processors Since the tagging is done in hardware at faster than wire speeds, no latency is involved in the actual tagging process And to ensure compatibility with accesslink devices, switches will strip off the tagging information and forward the original Ethernet frame to the device or devices connected to access-link connections From the user s perspective, the source generates a normal Ethernet frame and the destination receives this frame, which is an Ethernet 8023 or II frame coming in and the same going out In reality, this frame is tagged as it enters the switched infrastructure and sheds the tag as it exits the infrastructure: the process of tagging and untagging the frame is hidden from the users connected to access-link ports
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Trunk links are common between certain types of devices, including switch-toswitch, switch-to-router, and switch-to-file server connections Using a trunk link on a router is a great way of reducing your layer 3 infrastructure costs For instance, in the old days of bridging, in order to route between different broadcast domains,
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you needed a separate physical router interface for each broadcast domain So if you had two broadcast domains, you needed two router ports; if you had 20 broadcast domains, you needed 20 router ports As you can see, the more broadcast domains you had with bridges, the more expensive the router would become Today, with the advent of VLANs and trunk connections, you can use a single port on a router to route between your multiple broadcast domains If you had 2 or 20 broadcast domains, you could use just one port on the router to accomplish the routing between these different subnets Of course, you would need a router and an interface that supported trunking Not every Cisco router supports trunking; you would need at least a 1751 or higher router with the correct type of Ethernet interface If your router didn t support trunking, you would need a separate router interface for each VLAN you had created to route between the VLANs Therefore, if you have a lot of VLANs, it makes sense to economize and buy a router and the correct type of interface that supports trunking You can also buy specialized NICs for PCs or file servers that support trunking For instance, suppose you want multiple VLANs to access a file server You could use a normal NIC and set this up with an access-link connection to a switch Since this is an access-link connection, the server could belong only to one VLAN The users in the same VLAN, when accessing the server, would have all their traffic switched via layer 2 devices to reach it Users in other VLANs, however, would require that their traffic be routed to this server via a router, since the file server is in a different broadcast domain If throughput is a big concern, you might want to buy a trunk NIC for the file server Configuring this NIC is different from configuring a normal NIC on a file server For each VLAN in which you want the file server to participate, you would create a virtual NIC, assign your VLAN identifier and layer 3 addressing to the virtual NIC for the specific VLAN, and then associate it with the physical NIC Once you have created all of these logical NICs on your file server, you need to set up a trunk connection on the switch to the server And once you have done this, members of VLANs in the switched network will be able to access the file server directly without going through a router Since these cards can be expensive, many administrators will purchase these devices only for critical services A good example of a device that might need a trunk-capable NIC is a DHCP server, since it might need to assign IP addresses to users across multiple VLANs If you don t have a trunk-capable NIC, but users are spread across multiple VLANs, you could use the IP helper feature on a Cisco router connected to the users VLANs and have the router forward the DHCP broadcasts to the DHCP server located in a different VLAN
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