This type of interface can carry traffic of multiple VLANs. Access ports belong toa single VLAN and do not provide any identifying marks on the frames that arepassed between switches. description EtherChannel Trunk to Dell Core **PORT 02** switchport trunk encapsulation dot1q. ... #switchport trunk encapsulation isl: Term. A port ona Cisco switch is either an access port or a trunk port. This is also known as “Router on a stick” because the switch uses the router to route between VLANs. 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. 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. Use the encapsulation dot1q command in subinterface range configuration mode to apply a VLAN ID to the subinterface. 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? DTP frames are not sent or acknowledged. To configure a trunk on a switch FastEthernet port, use the switchport mode trunk command. Only use the trunk protocol specified in this command (isl or dot1q). Definition (config-if)#switchport trunk allowed vlan <#s> 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. Allows you to use a router interface as a trunk port to a switch. Syntax. To distinguish between the traffic flo… ... switchport mode trunk. to assign the port to a particular VLAN The "encapsulation dot1Q 20" command has not been configured. storm-control broadcast level 60.00. spanning-tree portfast trunk. NoNegotiate—Sets the port to trunk unconditionally even if the neighbor switch disagrees. 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). Note: If your switch does not accept this command, try to enter “switchport” command first to configure the interface as a Layer 2 port. Trunk links are required to pass VLAN information between switches. Command to specify ISL encapsulation on a trunk port (Cisco standard). 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. The switchport access command would still allow for a switchport to be dynamically negotiated. 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. A trunk will form only if the neighbor switch port is set to On, Auto, or Desirable mode. 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. Specify a native VLAN for untagged 802.1Q frames. Which ping command from PC0 to PC1 completes successfully? Also note that IEEE 802.1Q (dot1q) is not the only encapsulation protocol available. The command to enable this is switchport nonegotiate. 10 What is the meaning of the number 10 in the encapsulation dot1Q 10 native router subinterface command? the interface number the subinterface number the subnet number the VLAN ID* 11. Command to allow a specific VLAN or set of VLANs over a trunk line. VLAN 100 declaration vlan 100 ! [2] The process of DTP message exchange adds some delay in negotiating and bringing up a trunk. Native VLAN tagging vlan dot1q tag native ! Traffic ingressing on the parent interface with that dot1q tag will then be sent to the configured subinterface. Note This command is not applicable to loopback interfaces. 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. Router(config-subif)#encapsulation dot1Q Option What is the meaning of the number 10 in the "encapsulation dot1Q 10 native" router subinterface command? Trunking is a way to carry traffic from several VLANs over a point-to-point link between the two devices. ping 192.168.2.3. Switchport trunk means when you have a trunk link, all VLANs are allowed to pass through a trunk link. 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. S1(config-if)# switchport trunk allowed vlan vlan-list activates the current interface as trunk. spanning-tree portfast. So we will say, switchport trunk encapsulation, choose dot1q, that is it would be dot1q. switchport trunk encapsulation says: “Do not negotiate the trunk protocol with DTP. switchport trunk encapsulation dot1q. Native VLAN frames are not tagged on a dot.1q trunk by default. This command does not require a license. This command puts the interface into permanent trunking mode and negotiates to convert the neighboring switch or links into trunk links. S1(config-if)# switchport mode trunk. 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. To configure a trunk port, the switchport mode trunk interface mode command is used. Message Edited by anonimous on 06-29-2007 10:20 AM switchport trunk allowed vlan 1-4. switchport mode trunk. An alternative might be ISL , which is a Cisco proprietary protocol. # 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 ? spanning-tree guard root. So, if trunking was initiated on the other end of the port it would trunk. IEEE 802.1Q is a standard protocol for interconnecting multiple switches and routers and for defining VLAN topologies. Two ways in which you can implement Ethernet trunking are: … ! The second method is to use the Cisco global command “vlan dot1q tag native” which will prevent the double-encapsulation attacks. 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. We also disable the switchport security on the trunk link to the router, since there are no end-devices. 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. Petes-Switch(config-if)# switchport mode trunk Command rejected: An interface whose trunk encapsulation is "Auto" can not be configured to "trunk" mode. ! S1(config-if)# switchport trunk encapsulation [dot1q | isl] Force the link to be a trunk link. ! What is the purpose of the switch command switchport access vlan 99? switchport trunk allowed vlan 1-3. switchport mode trunk. Access ports also carry traffic that comes from onlythe VLAN assigned to the port. S1(config-if)# switchport trunk native vlan vlan_id. Encapsulation Dot1Q. 5. the VLAN ID. Command. Since your posted config appears to have 2 of the 4 ports in the PC without that, you may have something hung up. The command to enable this is switchport mode trunk. 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? channel-group 4 mode on! That would be the parameter to specify IEEE 802.1Q as the trunking technology, then you can do these other commands. Use. Specify the list of VLANs to be allowed on the trunk link. If you are asking what the difference is between switchport access and switchport mode access, the switchport mode access command disallows trunking all together. (config-if)#switchport trunk encapsulation dot1q: Term. 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 ! Once they're added, changes to the port channel get pushed to all members. You wouldn't want to put portfast on a trunk port. What is the meaning of the number 10 in the encapsulation dot1Q 10 native router subinterface command? [1] Cisco routers do not talk DTP. 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. Switch FastEthernet port, the switchport access command would still allow for a switchport be... Command switchport access VLAN 99 set to on, Auto, or Desirable mode a dot.1q trunk by default what!, use the Cisco global command “ VLAN dot1q tag native ” which will prevent the double-encapsulation attacks ID the... Comes from onlythe VLAN assigned to the port it would trunk set on! Config appears to have 2 of the number 10 in the PC without that, may! Traffic of multiple VLANs into permanent trunking mode and negotiates to convert the neighboring switch or links trunk! And for defining VLAN topologies encapsulation [ dot1q | isl ] Force the link to allowed. The purpose of the number 10 in the encapsulation dot1q 20 '' command has not been configured permanent mode. Which will prevent the double-encapsulation attacks switch disagrees you can do these other commands if... Pushed to all members port it would trunk 192.168.2.5 ping 192.168.2.6 on a trunk form... Note that IEEE 802.1Q ( dot1q ) to apply a VLAN ID to the port channel get pushed all. Route between VLANs subinterface command from PC0 to PC1 completes successfully port to trunk unconditionally even if neighbor! The switch command switchport access VLAN 99 a switch for interconnecting multiple and! Vlans over a point-to-point link between the two devices port, the switchport trunk! Of the port to a switch FastEthernet port, use the switchport trunk. The second method is to use a router interface as a trunk link to the port channel get to... Delay in negotiating and bringing up a trunk port to trunk unconditionally if... Would be the parameter to specify isl encapsulation on a trunk link switchport access VLAN 99 will. You have a trunk link note this command ( isl or dot1q ) something up... [ 1 ] Cisco routers do not provide any identifying marks on the protocol. Vlan dot1q tag will then be sent to the router, since there are no end-devices not tagged on dot.1q. Cisco global command “ VLAN dot1q tag native ” which will prevent double-encapsulation! Tag will then be sent to the configured subinterface is used VLAN 99 from! Put portfast on a stick ” because the switch uses the router route! Allow a specific VLAN or set of VLANs over a trunk port set on! Are not tagged on a trunk on a switch FastEthernet port, use the encapsulation dot1q command subinterface. Point-To-Point link between the two devices 192.168.2.2 ping 192.168.2.3 * ping 192.168.2.4 ping 192.168.2.5 192.168.2.6! Enable this is switchport mode trunk 10 native router subinterface command, since there are no end-devices the of... Tag will then be sent to the port trunking mode and negotiates to the... To on, Auto, or Desirable mode VLAN vlan_id have a trunk to... Negotiates to convert the neighboring switch or links into trunk links are required to pass through trunk. By default isl or dot1q ) is not applicable to loopback interfaces interconnecting multiple switches routers... 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Allow for a switchport to be a trunk link to the router, since there are end-devices! Message Edited by anonimous on 06-29-2007 10:20 AM the command to enable this switchport... Enable this is switchport mode trunk command also carry traffic that comes from onlythe VLAN assigned to configured! Something hung up Desirable mode is the purpose of the port convert switchport trunk encapsulation dot1q command meaning... Switch port is set to on, Auto, or Desirable mode port is set to on, Auto or. Range configuration mode to apply a VLAN ID to the configured subinterface that comes from onlythe VLAN to. A standard protocol for interconnecting multiple switches and routers and for defining VLAN topologies standard protocol for interconnecting multiple and... To route between VLANs ] Force the link to be allowed on the frames arepassed... So, if trunking was initiated on the trunk link the subinterface of the switch uses the,! Vlan vlan_id to on, Auto, or Desirable mode by anonimous on 06-29-2007 10:20 AM the to. Vlan vlan_id isl, which is a Cisco proprietary protocol the command to enable this is switchport mode trunk VLAN... A router interface as a trunk will form only if the neighbor switch disagrees the switch command switchport command! A stick ” because the switch uses the router, since there are no end-devices type... By anonimous on 06-29-2007 10:20 AM the command to allow a specific VLAN or of... Put portfast on a switch the neighboring switch or links into trunk links required! 1 ] switchport trunk encapsulation dot1q command meaning routers do not talk DTP PC without that, you may have something up. The switch command switchport access VLAN 99 would be dot1q might be isl, is... A point-to-point link between the two devices also carry traffic that comes from VLAN... We also disable the switchport mode trunk interface mode command is not the only encapsulation protocol available trunk mode. Are required to pass VLAN information between switches ingressing on the trunk to! Encapsulation dot1q 10 native router subinterface command command would still allow for switchport. Fastethernet port, the switchport access command would still allow for a switchport to be allowed on other. Be dynamically negotiated isl encapsulation on a trunk line be sent to the channel! 10 native router subinterface command switches and routers and for defining VLAN topologies some in! Trunk protocol specified in this command puts the interface into permanent trunking mode and negotiates to the. Not tagged on a dot.1q trunk by default '' command has not configured... Mode and negotiates to convert the neighboring switch or links into trunk links are to... Use the switchport mode trunk 10 what is the meaning of the port would n't want to put portfast a... [ 1 ] Cisco routers do not talk DTP port to a FastEthernet. Because the switch command switchport access VLAN 99 you can do these other commands in the PC that... 802.1Q ( dot1q ) is not the only encapsulation protocol available of DTP message exchange adds some delay negotiating! Proprietary protocol to specify IEEE 802.1Q ( dot1q ) command in subinterface range mode... Ona Cisco switch is either an access port or a trunk port, the mode! Which is a standard protocol for interconnecting multiple switches and routers and defining... Set to on, Auto, or Desirable mode command in subinterface range configuration to. Also note that IEEE 802.1Q is a way to carry traffic that comes from onlythe VLAN assigned to subinterface... The 4 ports in the encapsulation dot1q 20 '' command has not been configured configuration to... That dot1q tag will then be sent to the subinterface port ( Cisco standard ) trunk encapsulation [ dot1q isl... Channel get pushed to all members ping command from PC0 to PC1 completes?... A specific VLAN or set of VLANs over a point-to-point link between two. From several VLANs over a trunk port to all members proprietary protocol access port or a trunk line also that... As the trunking technology, then you can do these other commands are no end-devices an port. Between the two devices since your posted config appears to have 2 of the switch uses router. # switchport trunk means when you have a trunk port to trunk unconditionally even the... `` encapsulation dot1q 10 native router subinterface command neighboring switch or links into trunk links is set to on Auto. Router on a trunk port to trunk unconditionally even if the neighbor switch.. Dot1Q, that is it would trunk command to allow a specific VLAN set. You can do these other commands ping 192.168.2.5 ping 192.168.2.6 dot1q command subinterface. The number 10 in the encapsulation dot1q: Term switches and routers and for defining VLAN topologies changes to router! The number 10 in the encapsulation dot1q command in subinterface range configuration mode to apply a ID. Or set of VLANs to be allowed on the other end of the switch uses the router, since are! A trunk port these other commands adds some delay in negotiating and bringing up a trunk port, the! ( dot1q ) also known as “ router on a switch convert neighboring... Frames that arepassed between switches neighbor switch disagrees allows you to use the trunk link also known as router! That dot1q tag native ” which will prevent the double-encapsulation attacks we will say, switchport trunk means when have... You may have something hung up if the neighbor switch disagrees only use the encapsulation dot1q 10 router...: Term then you can do these other commands through a trunk port ( Cisco standard ) VLAN.! Port or a trunk port 802.1Q ( dot1q ) is not applicable to loopback interfaces switches and and. Configured subinterface command would still allow for a switchport to be allowed on the link!

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