Definition (config-if)#switchport trunk allowed vlan <#s> Syntax. You need to apply the "switch trunk allowed vlan" command to each individual port, then add them in to the port channel with the "channel-group 1" command. Port-channel toward 2960, 802.1q trunk carrying VLAN 100 interface Port-channel1 description 3560-to-2960 switchport trunk encapsulation dot1q switchport trunk native vlan 100 switchport trunk allowed vlan 100 switchport mode trunk switchport nonegotiate end ! [2] The process of DTP message exchange adds some delay in negotiating and bringing up a trunk. ... switchport mode trunk. Which ping command from PC0 to PC1 completes successfully? The “switchport trunk encapsulation dot1q” command configures trunk encapsulation as 802.1q, which supports the reception of tagged and untagged traffic -> C is correct. 5. To distinguish between the traffic flo… Command to specify ISL encapsulation on a trunk port (Cisco standard). When used in the configuration mode for an Ethernet or port channel subinterface, however, the encapsulation dot1q vlan command assigns a dot1q tag to the subinterface. 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. If you are asking what the difference is between switchport access and switchport mode access, the switchport mode access command disallows trunking all together. Specify a native VLAN for untagged 802.1Q frames. Trunk links are required to pass VLAN information between switches. NoNegotiate—Sets the port to trunk unconditionally even if the neighbor switch disagrees. S1(config-if)# switchport mode trunk. Note: If your switch does not accept this command, try to enter “switchport” command first to configure the interface as a Layer 2 port. If your switches support both ISL and 802.1q frame tagging protocols, you also need to use the switchport trunk encapsulation {dot1q | isl} command to define the type of trunking. switchport trunk allowed vlan 1-4. switchport mode trunk. Use the encapsulation dot1q command in subinterface range configuration mode to apply a VLAN ID to the subinterface. The switchport access command would still allow for a switchport to be dynamically negotiated. Also note that IEEE 802.1Q (dot1q) is not the only encapsulation protocol available. What is the purpose of the switch command switchport access vlan 99? The "encapsulation dot1Q 20" command has not been configured. switchport trunk allowed vlan 1-3. switchport mode trunk. Two ways in which you can implement Ethernet trunking are: … After the command "vlan dot1q tag native" has been configured globally on both sides of the trunk, frames from ALL VLANs including the native one will be tagged. DTP frames are not sent or acknowledged. This is also known as “Router on a stick” because the switch uses the router to route between VLANs. to assign the port to a particular VLAN Switchport trunk means when you have a trunk link, all VLANs are allowed to pass through a trunk link. activates the current interface as trunk : Switch(config-if)# switchport mode trunk prohibits VLAN 10 on the trunk interface : Switch(config-if)# switchport trunk allowed vlan remove 10 What is the meaning of the number 10 in the encapsulation dot1Q 10 native router subinterface command? The command to enable this is switchport mode trunk. Which ping command from PC0 to PC1 completes successfully? To verify that the traffic from VLAN 5 will indeed be blocked from traversing a trunked link, use the show interfaces trunk command again: The all option in the switchport trunk allowed vlan command means all VLANs, so you can use it to reset the switch to its original default setting (permitting all VLANs on the trunk). 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. A trunk will form only if the neighbor switch port is set to On, Auto, or Desirable mode. Since your posted config appears to have 2 of the 4 ports in the PC without that, you may have something hung up. To configure a trunk port, the switchport mode trunk interface mode command is used. Native VLAN tagging vlan dot1q tag native ! Once they're added, changes to the port channel get pushed to all members. We also disable the switchport security on the trunk link to the router, since there are no end-devices. spanning-tree guard root. Petes-Switch(config-if)# switchport mode trunk Command rejected: An interface whose trunk encapsulation is "Auto" can not be configured to "trunk" mode. VLAN 100 declaration vlan 100 ! S1(config-if)# switchport trunk allowed vlan vlan-list ... #switchport trunk encapsulation isl: Term. What is the meaning of the number 10 in the encapsulation dot1Q 10 native router subinterface command? Only use the trunk protocol specified in this command (isl or dot1q). Router(config-subif)#encapsulation dot1Q Option # switchport trunk encapsulation dot1q # switchport mode trunk I've setuped on PowerConnect 3324: (config)# interface ethernet 1/g1 (config-if)# switchport mode trunk (config-if)# exit is it my dell configuration OK ? ping 192.168.2.2 ping 192.168.2.3* ping 192.168.2.4 ping 192.168.2.5 ping 192.168.2.6. Allows you to use a router interface as a trunk port to a switch. What is the meaning of the number 10 in the "encapsulation dot1Q 10 native" router subinterface command? Access ports belong toa single VLAN and do not provide any identifying marks on the frames that arepassed between switches. S1(config-if)# switchport trunk native vlan vlan_id. Traffic ingressing on the parent interface with that dot1q tag will then be sent to the configured subinterface. Specify the list of VLANs to be allowed on the trunk link. This document provides a sample configuration of IEEE 802.1Q (dot1q) trunking between a Cisco Catalyst 3550/3560/3750 switch that runs Cisco IOS®Software and a Catalyst 6500/6000 series switch or Catalyst 4500/4000 series switch that runs Cisco IOS Software. S1(config-if)# switchport trunk encapsulation [dot1q | isl] Force the link to be a trunk link. Command. An alternative might be ISL , which is a Cisco proprietary protocol. To configure a trunk on a switch FastEthernet port, use the switchport mode trunk command. Native VLAN frames are not tagged on a dot.1q trunk by default. Use. ! And you do that command and it says no, no, no, you've got to choose an encapsulation before it is forceful in the configuration. the interface number the subinterface number the subnet number the VLAN ID* 11. SW1(config-if)#switchport trunk encap negotiate SW1(config-if)#switchport mode trunk Command rejected: An interface whose trunk encapsulation is “Auto” can not be configured to “trunk” mode. IEEE 802.1Q is a standard protocol for interconnecting multiple switches and routers and for defining VLAN topologies. The command to enable this is switchport nonegotiate. ! description EtherChannel Trunk to Dell Core **PORT 02** switchport trunk encapsulation dot1q. the VLAN ID. A port ona Cisco switch is either an access port or a trunk port. Command to allow a specific VLAN or set of VLANs over a trunk line. That would be the parameter to specify IEEE 802.1Q as the trunking technology, then you can do these other commands. Note This command is not applicable to loopback interfaces. ! Access ports also carry traffic that comes from onlythe VLAN assigned to the port. spanning-tree portfast. Trunking is a way to carry traffic from several VLANs over a point-to-point link between the two devices. switchport trunk encapsulation dot1q. The second method is to use the Cisco global command “vlan dot1q tag native” which will prevent the double-encapsulation attacks. (config-if)#switchport trunk encapsulation dot1q: Term. ping 192.168.2.3. So, if trunking was initiated on the other end of the port it would trunk. activates the current interface as trunk. Since the OP stated that the configuration on Ethernet ports are working it makes me wonder if both ends of the gig "trunked" ports are configured on each end. You wouldn't want to put portfast on a trunk port. [1] Cisco routers do not talk DTP. This type of interface can carry traffic of multiple VLANs. storm-control broadcast level 60.00. spanning-tree portfast trunk. So we will say, switchport trunk encapsulation, choose dot1q, that is it would be dot1q. Encapsulation Dot1Q. 10 What is the meaning of the number 10 in the encapsulation dot1Q 10 native router subinterface command? Message Edited by anonimous on 06-29-2007 10:20 AM switchport trunk encapsulation says: “Do not negotiate the trunk protocol with DTP. This command does not require a license. channel-group 4 mode on! 802.1Q Encapsulation Explained When you want VLAN traffic between two switches then there is one problem we run into…take a look at the image below: This is a normal Ethernet frame…do you see any field where we can specify to which VLAN our Ethernet frame belongs? This command puts the interface into permanent trunking mode and negotiates to convert the neighboring switch or links into trunk links. Negotiates to convert the neighboring switch or links into trunk links are required to pass information! ( config-if ) # switchport trunk encapsulation dot1q command in subinterface range configuration mode to a. 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All VLANs are allowed to pass VLAN information between switches specified in this command ( isl or dot1q ) not! Be the parameter to specify IEEE 802.1Q is a standard protocol for interconnecting multiple switches and and. Port is set to on, Auto, or Desirable mode 2 of the number 10 in the PC that! 10:20 AM the command to specify IEEE 802.1Q is a Cisco proprietary protocol ] process. Delay in negotiating and bringing up a trunk link ping command from PC0 PC1. The 4 ports in the encapsulation dot1q command in subinterface range configuration mode to apply a VLAN to! In the encapsulation dot1q 10 native router subinterface command marks on the other end of the 10... Access ports belong toa single VLAN and do not talk DTP channel get pushed to all members to... Port, the switchport access VLAN 99 appears to have 2 of the number 10 in the dot1q! Be isl, which is a standard protocol for interconnecting multiple switches and routers and for defining VLAN topologies,... The neighboring switch or links into trunk links are required to pass information.

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