(config-subif)# encapsulation dot1q VLAN_ID – sets the subinterface to trunk and associates it with a specific VLAN. Solution I don’t know if this is a throwback to when we had ISL trunking and 802.1q, but you need to specify the encapsulation before you can specify a trunk. Note: the block on 192.168.1.0 network was broken down into three subnets using a /27 subnet mask giving us the 192.168.1.0,192.168.1.32,192.168.1.64, etc subnets. We will use the following network in our example: We have a network of three hosts, a switch and a router. Encapsulation Dot1Q. The "encapsulation dot1Q 1 native" command was added in Cisco IOS version 12.1(3)T. If you are using an earlier version of Cisco IOS, the IP address for VLAN1 (Native VLAN) is configured on the main interface, and no encapsulation for VLAN1(Native VLAN) will be done under the sub-interface. In the configuration mode for an Ethernet or port channel interface, the encapsulation dot1q vlan translates packets with a dot1q header to the internal VLAN for a routed port. Hi Bogon, encapsulation dot1q 1 native is a Router Sub-Interface command. The show capabilities shows that the interface can use 802.1q, but when I try to CLI the command the work encapsulation is not an option. The Different "Flavors" of Ethernet. That would be the parameter to specify IEEE 802.1Q as the trunking technology, then you can do these other commands. This example shows how to enable dot1Q encapsulation on a subinterface for VLAN 30: VLAN to set when the interface is in access mode; valid values are from 1 to 4093, except for the VLANs reserved for internal switch use. So we will say, switchport trunk encapsulation, choose dot1q, that is it would be dot1q. Trunking is a way to carry traffic from several VLANs over a point-to-point link between the two devices. What about our native VLAN? Router(config-subif)#encapsulation dot1Q Option Often referred to as "dot1q" (because geeks like lingo), this protocol does not re-encapsulate the original frame, but instead inserts a 4-byte tag into the original header. Two ways in which you can implement Ethernet trunking are: … encapsulation dot1Q 10 ip address 192.168.1.1 255.255.255.0 interface FastEthernet0/0.20 encapsulation dot1Q 20 ip address 192.168.2.1 255.255.255.0: For what reason would a network administrator use the show interfaces trunk command on … On the contrary, Native VLAN only exists in DOT1Q encapsulation type. It is important that the encapsulation number matches the vlan ID for which that sub-interface is being created. ISL and DOT1Q – ISL and DOT1Q are 2 encapsulation standards supporting Virtual LANs (VLANs) on an Ethernet network. Router(config-subif)# IP address 10.10.10.1 255.255.255.252: Configure IP address Use the encapsulation dot1q command in subinterface range configuration mode to apply a VLAN ID to the subinterface. ‘l2-protocol encapsulation dot1q vlan’ enables Layer 2 802.1Q traffic encapsulation on the configuration mode interface for a specified VLAN; e.g. The IEEE-standard 802.1Q trunk encapsulation has the advantage of being an industry standard, so inter-vendor operation is much less of a problem. IEEE 802.1Q is a standard protocol for interconnecting multiple switches and routers and for defining VLAN topologies. CLI Statement. DOT1Q: Abbreviation for: ISL (Inter Switch Link) – Standard: Cisco proprietary protocol: IEEE Standard: Vlans Supported: Supports up to 1000 Vlans: Supports 4096 Vlans: Encapsulation: Original frame is encapsulated and a new header is inserted during encapsulation process. Displays dot1Q encapsulation information for a VLAN. This is also known as “Router on a stick” because the switch uses the router to route between VLANs. IEEE 802.1Q, often referred to as Dot1q, is the networking standard that supports virtual LANs (VLANs) on an IEEE 802.3 Ethernet network. These are the 2 frame tagging protocols that Cisco supports. Router(config-subif)#encapsulation dot1q 99: Define encapsulation type: 05: IP address. Option 1 Translate Vlan Tag(s)! 802.1Q tunneling (aka Q-in-Q) is a technique often used by Metro Ethernet providers as a layer 2 VPN for customers. By default, native VLAN packets going out this port will be tagged. Sets the vlan on the subinterface to act as the native VLAN. 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. In which location are the normal range VLANs stored on a Cisco switch by default? encapsulation dot1q This command does not require a license. Note This command is not applicable to loopback interfaces. To enable IEEE 802.1Q encapsulation of traffic on a specified subinterface, use the What is the meaning of the number 10 in the encapsulation dot1Q 10 native router subinterface command? Native VLAN - The VLAN associated with all untagged traffic on a trunk Thats all you need to enable inter Vlan routing on a cisco router. Tunneling is referred to the whole process of encapsulation, transmission and de-encapsulation, while encapsulation is only a step within this entire process. This is the method used by Meraki devices. Refer to the exhibit. What is the alternative trunk encapsulation dot1q command for Cisco Catalyst 2960? I have a Cisco 2960 switch that is not allowing me to setup switchport trunk encapsulation dot1q on a trunking interface. switchport trunk encapsulation dot1q This refers to the IEEE 802.1Q communication standard . 802.1Q Encapsulation Explained. 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