If you platform does not have the configuration option to tag all VLANs, you assign the Native VLAN to a bogus VLAN like 999, all other VLANs with traffic will be tagged. Native VLAN and Default VLAN is different: Default VLAN values: 1,1002-1005: Any one VLAN per dot1q trunk port. La commande switchport trunk encapsulation dot1q force l’interface à passer en dot1q (sinon elle est en auto). All the other VLANs need to be configured on the sub-interfaces of the physical port and it is there that the "encapsulation dot1q " command is required. IEEE 802.1Q, often referred to as Dot1q, is the networking standard that supports virtual LANs (VLANs) on an IEEE 802.3 Ethernet network. First, we will configure the port connected to 2611XM’s Fa0/1 interface to be a trunk on the switch. Vérifier que votre commutateur est capable de remplir des tâches de routage. https://nwl.cl/2hvyav0 - This tutorial explains what 802.1Q is and why we need it for trunk links between switches. Router(config-subif)# encapsulation dot1q vlan-id native Enables IEEE 802.1Q encapsulation of traffic on a specified subinterface in VLANs, and defaults to 1. Encapsulation Dot1Q. So you would say switchport trunk encapsulation and then you would choose dot1q. Now, we will move to the router. This is typically a default gateway. In case of dot1q, make sure that the native VLAN matches across the link. Navaneet says March 13, 2019 at 11:41 pm. The purpose of creating a VLAN that's not tagging on trunk link is enabling trunk negotiation and basic connectivity if the opposite trunk sites are not configured correctly. Specify the list of VLANs to be allowed on the trunk link. on the other hand g9/38, the port is configured as a static access port. So if the sending side tags the native vlan while the receiving side doesn't, will it result in some kind of fake QinQ situation? 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 ! Yes, you can see it on the screen. La commande switchport mode trunk passe le lien en trunk. My view on encapsulation dot1q id native and typically this would be encapsulation dot1q 1 native is that it's inclusion is for devices on the network that do not understand tagging. Vérification Switch#show vlan ? For testing we will add a couple SVI interfaces so we can do some ping tests. switchport trunk encapsulation dot1q . Activer le routage IPv4 : (config)#ip routing Créer les VLANs et les ports Trunks vers les commutateurs d’accès. The second method is to use the Cisco global command “vlan dot1q tag native” which will prevent the double-encapsulation attacks. encapsulation dot1q 1 native tells the Router to associate the sub-interface to VLAN 1, but as the native VLAN — i.e. Sets the vlan on the subinterface to act as the native VLAN. But you should still be able to route between PCs connected to switch ports in different VLANs 1 and 25. Allows you to use a router interface as a trunk port to a switch. Make sure the native VLAN for an IEEE 802.1Q trunk is the same on both ends of the trunk link. So if a switch receives on a trunk interface a standard ethernet frame, it will place it in this native … switchport mode trunk For Layer 2 IOS switches, such as the 2900XL or the 3500XL, the default encapsulation method is isl. ! Data frames from those devices are still picked up (and those devices may not be administered with a VLAN ID (default VLAN 1) or, given an alternative VLAN id such as VLAN 99. SW(config-if)# swtichport trunk encapsulation dot1q Choisir un mode static ou dynamic. So, switchport trunk encap dot1q x is defaulted to vlan1 and assumed on a trunk port.....appreciate your responses greatly. Syntax. Configurez l’interface du réseau local virtuel VLAN 99. Router(config-subif)#encapsulation dot1Q Option La commande “encapsulation dot1q 30” permet donc d’encapsuler une trame pour transiter sur le vlan 30 si elle est destinée à celui ci. I'm using Cat4000 as switch and Cat2948G-L3 as router on the stick. Network segmentation is essential for protecting critical business assets. Router(config-subif)#encapsulation dot1Q Option The other option when choosing a trunk link is the encapsulation method. Switch(config-if)#switchport trunk encapsulation dot1q. If it still doesn't work, the only remaining thing is the "native" for int f 0/1.1 . I'm wonder if I can see the result of the vlan dot1q tag native command, somewhere in the output of show commands. Si le switch supporte 802.1q et ISL, il faut lui spécifier quelle encapsulation utiliser. Use. 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. Is this true? Let’s look at an example. SWITCH2(config-if)# show interface f0/24 switchport Name: Fa0/24 Switchport: Enabled Administrative Mode: trunk Operational Mode: trunk Administrative Trunking Encapsulation: dot1q Operational Trunking Encapsulation: dot1q Negotiation of Trunking: On Access Mode VLAN: 1 (default) Trunking Native Mode VLAN: 100 (VLAN0100) SW1#show interfaces trunk Port Mode Encapsulation Status Native vlan Fa0/1 on 802.1q trunking 1 Port Vlans allowed on trunk Fa0/1 1-4094 Port Vlans allowed and active in management domain Fa0/1 1,10,20,30 Port Vlans in spanning tree forwarding state and not pruned Fa0/1 1,10,20,30 SW1# Syntax. We can change this if we want. Il est aussi possible de configurer le VLAN Natif : Router(config)#interface fastEthernet 0/0.666 Router(config-subif)#encapsulation dot1Q 666 native . Thanks...really appreciate your effort....afraid your design is not similar based on software versions (running strictly Cisco Classic IOS on my devices)....Thanks for you help. Note fa0/19, which is set to ISL. S1(config-int)#ip address 172.17.99.11 255.255.255.0 . Typically, you configure 802.1Q trunks with a native VLAN ID, which strips tagging from all packets on that VLAN. ! The standard defines a system of VLAN tagging for Ethernet frames and the accompanying procedures to be used by bridges and switches in handling such frames. To configure trunk link and native VLAN on Switch 2, open console connection to Switch 2 and enter the commands as shown below. Configure the ip address command on a subinterface and use the encapsulation dot1q vlan-id native subcommand to tell the router both the VLAN ID and the fact that it is the native VLAN. interface GigabitEthernet0/1.1 encapsulation dot1Q 1 native ip address 192.168.3.251 255.255.255.0 ip nat outside ip virtual-reassembly in ! http://www.cisco.com/warp/customer/473/50.shtml#801.1Q, http://www.cisco.com/warp/customer/473/50.shtml#intro. Switch(config)# do show int fa0/32 sw. Name: Fa0/32. Syntax. interface GigabitEthernet0/1 ip address 192.168.2.254 255.255.255.0 ip nat inside ip virtual-reassembly in duplex auto speed auto ! Example. OK lets go with the encapsulation dot1q 1 native does not tag the vlan, thus telling the router subinterface that this is the native vlan. Fasteth0/1 you just configure an ip address. The native vlan is the vlan in which dot1q untagged frames are conveyed. Switchport Trunk Encapsulation dot1q. Hope this helps =) Reply. Being the evolution of ISR4400 series routers, the Catalyst 8300 series edge platforms will be the new Access... Cisco DNA Software Demo Series - ISE: Policy and Access ControlRegister nowThursday, January 14, 202110:00AM Pacific Standard Time (San Francisco, GMT-08:00) If you configure "router on a stick" using subinterfaces simply use "encapsulation dot1Q x native" on the subinterface belonging to the VLAN which is native on the switch end of the line. These are the 2 frame tagging protocols that Cisco supports. IOS on router does not require a Native and Hybrid software on certain platforms allows you to configure all VLANs to be tagged. Du côté du switch, il suffit de monter un Trunk classique. Great work as always! shows that the native VLAN on other side of the trunk link is different from what we configured here. I "router on the stick" each subinterface has to have its own IP address within its VLAN!! Le routeur a besoin de cette information par exemple quand il voit une trame venant du vlan 20 (étiquetée vlan 20) qui souhaite se diriger sur le vlan 30. What's the purpose of creating a VLAN that's not tagging on trunk link? Encapsulation Dot1Q. Now we configure the router’s Fa0/1 interface to act as a trunk. Administrative Mode: dynamic auto. For COS switches or integrated IOS switches, the default encapsulation is negotiate. IEEE 802.1Q, often referred to as Dot1q, is the networking standard that supports virtual LANs (VLANs) on an IEEE 802.3 Ethernet network. This is also known as “Router on a stick” because the switch uses the router to route between VLANs. The main interface holds the IP for the Native VLAN. The l2-protocol encapsulation dot1q vlan command enables Layer 2 802.1Q traffic encapsulation on the configuration mode interface for a specified VLAN. IEEE 802.1Q encapsulation is configurable on Ethernet and EtherChannel interfaces. The VLAN in the incoming packets is mapped to the internal VLAN of the routed port, and packets egressing the routed port are encapsulated with a dot1q header for the specified VLAN. This is also known as “Router on a stick” because the switch uses the router to route between VLANs. I tried your recommendations, router has following: but then when w/s connects to 2950 switchport f0/2 , the w/s can only ping gateway, nothing else, not even dhcp server.... Should a bridge group be created for IEEE 802.1q? These are the 2 frame tagging protocols that Cisco supports. Switchport Trunk Encapsulation dot1q. Router(config-subif)#encapsulation dot1Q X. Router(config-subif)#ip address adresse-ip masque. What is the meaning of the number 10 in the encapsulation dot1Q 10 native router subinterface command? 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. Switchport: Enabled. This is the method used by Meraki devices. BTW, using a 2950-48 switch running 12.1(6) where isl is not supported. Allows you to use a router interface as a trunk port to a switch. 802.1Q encapsulation, which is configured automatically, when trunking is enabled on the interface by using switchport mode trunk command. Use. 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. So, under the Main interface ex. Example 17-2 shows both native VLAN configuration options with a small change to the same configuration in Example 17-1. Native VLAN frames are not tagged on a dot.1q trunk by default. 6500(config-if)#switchport trunk encapsulation dot1q 6500(config-if)#switchport mode trunk 6500(config-if)# Filtrage des vlans sur un port uplink Pour les swiths série 2950, 2960, 3750, 6500 (dans l'exemple, on autorise les vlans 2,3 et 10 a être transportés sur le lien). incoming/outgoing traffic is associated to VLAN 1, but no VLAN tag is added. Encapsulation Dot1Q. super explanation of VLAN . https://nwl.cl/2hvyav0 - This tutorial explains what 802.1Q is and why we need it for trunk links between switches. While configuring 802.1Q trunking it is very important to match the native VLAN across the link. First, we remove the ip address on the physical interface. The standard defines a system of VLAN tagging for Ethernet frames and the accompanying procedures to be used by bridges and switches in handling such frames. ... switchport trunk encapsulation dot1q. This is also known as “Router on a stick” because the switch uses the router to route between VLANs. (again I suppose router connected to the switch via f0/1). On Cisco devices, some protocols such as CDP or DTP are transported in untagged frames and thus in the native vlan. The Native vlan is a vlan that the switch doesn ‘t add vlan information on the frame. S1(config-if)# switchport trunk encapsulation [dot1q | isl] Force the link to be a trunk link. Encapsulation - The process of modifying frames of data to include additional information. 802.1Q tunneling (aka Q-in-Q) is a technique often used by Metro Ethernet providers as a layer 2 VPN for customers. I assigned the switch an IP address using "int vlan 50". CO22DCWCRK1SW1#sho int port-channel 5 trunk Port Mode Encapsulation Status Native vlan Po5 on 802.1q trunking 1 Port Vlans allowed on trunk Po5 1,5,300,500 Port Vlans allowed and active in management domain Po5 1,5,300,500 Port Vlans in … La commande "encapsulation dot1q 30" permet donc d'encapsuler une trame pour transiter sur le vlan 30 si elle est destinée à celui ci. If the native VLAN on one end of the trunk is different from the native VLAN on the other end, spanning-tree loops might result. Switch(config-if)#switchport nonegotiate . Use. Let’s look at an example. First, here is the trunking information for SW3. Router(config)#interface fastEthernet 0/0.20 Router(config-subif)#encapsulation dot1Q 20 Router(config-subif)#ip address 192.168.20.254 255.255.255.0 . BRANCH(config-subint)#ip address 172.17.99.1 255.255.255.0. Allows you to use a router interface as a trunk port to a switch. S1(config-if)# switchport trunk allowed vlan vlan-list SWITCH2(config-if)# show interface f0/24 switchport Name: Fa0/24 Switchport: Enabled Administrative Mode: trunk Operational Mode: trunk Administrative Trunking Encapsulation: dot1q Operational Trunking Encapsulation: dot1q Negotiation of Trunking: On Access Mode VLAN: 1 (default) Trunking Native Mode VLAN: 100 (VLAN0100) According to previous posting VLAN999 is created to pass only Layer 2 info and does not have a subnet configured. Operational Mode: trunk. Gracias. 802.1Q Encapsulation; How to configure a trunk between switches; How to change the Native VLAN; Cisco DTP (Dynamic Trunking Protocol) Negotiation; 802.1Q Tunneling (Q-in-Q) Etherchannel over 802.1Q Tunneling; Private VLANs (PVLAN) InterVLAN Routing; Troubleshooting VLANs & Trunks; Troubleshooting Inter-VLAN Routing ; Unit 3: VTP (VLAN Trunking Protocol) VTP (VLAN Trunking … The link between the switch and router is a trunk obviously using dot1q encapsulation. But I told you already what I think is necessary. We can change this if we want. ! "The "encapsulation dot1Q 1 native" command was added in Cisco IOS version 12.1(3)T., for earlier Cisco IOS, the IP address for Native VLAN is configured on the main interface, and no encapsulation for Vlan1(Native Vlan) under the sub-interface." Finally, configure an ip address for the VLAN. Administrative Trunking Encapsulation: dot1q. To provide additional security for traffic passing through an 802.1Q trunk port, the vlan dot1q tag native command was introduced. switchport trunk encapsulation dot1q switchport mode trunk. Your default gateway is strange: If IP address is 10.12.0.2 255.255.255.128 the default gateway should be 10.12.0.x where x is between 1 and 126. Best Practices. Use the encapsulation dot1q command in subinterface range configuration mode to apply a VLAN ID to the subinterface. The Cisco Catalyst 8300 Series Edge Platforms brings rich co... Cisco DNA Software Demo Series - ISE: Policy and Access Cont... Cisco DNA Software Demo Series - Software-Defined Access, Cisco DNA Software Demo Series - Cisco DNA Spaces. Syntax. So if a switch receives on a trunk interface a standard ethernet frame, it will place it in this native vlan, in a way, a default vlan (marking). Native VLAN tagging vlan dot1q tag native ! Usage Guidelines. Regarding Router on a Stick/Inter VLAN Routing, is the following possible? Switch(config-if)#switchport trunk encapsulation dot1q . The default VLAN for all interfaces is VLAN 1. To provide additional security for traffic passing through an 802.1Q trunk port, the vlan dot1q tag native command was introduced. Maybe you have a sample working config? switcHuaweiort trunk encapsulation dot1q switcHuaweiort trunk allowed vlan 1,5,300,500 switcHuaweiort mode trunk switcHuaweiort nonegotiate! Administrative Trunking Encapsulation: dot1q Operational Trunking Encapsulation: dot1q Negotiation of Trunking: On Access Mode VLAN: 1 (default) Trunking Native Mode VLAN: 99 (Inactive) Administrative Native VLAN tagging: enabled. Use. Router(config-subif)#encapsulation dot1Q Option Sets the vlan on the subinterface to act as the native VLAN. Next, we configure a subinterface for each VLAN the link will be a trunk for. Thanks! VLAN 100 declaration vlan 100 ! So we can see here, the Name FastEthernet 0/11, Switchport: Enabled, ooh, that's important. Thank you. This command has to be entered before the IP address or you will get an error seen below. S1(config)#int vlan 99. Le routeur a besoin de cette information par exemple quand il voit une trame venant du vlan 20 (étiquetée vlan 20) qui souhaite se diriger sur le vlan 30. Please help. However, I'm having a problem because the router won't be able to see the switch on the other side that is configured as follows (on switch): But, then, intervlan routing doesn't work....This is a catch 22 situation that needs to be resolved. Encapsulation type ! interface fastethernet 0/0 no ip address. to view the native VLAN; to examine DTP negotiation as it occurs; to verify port association with a particular VLAN; to display an IP address … The tagging protocol can be manually specified on a trunk port, or dynamically negotiated using Cisco’s proprietary Dynamic Trunking Protocol (DTP). Une fois vos VLANs reliés au routeur, le routeur crée les routes permettant la communication entre eux. Is this command required on both ends of a trunk link? After that, we configure encapsulation dot1q for each subinterface. ! Please look at this: Switch(config)# vlan dot1q tag native . VLAN 100 declaration vlan 100 ! Pour ajouter un gateway au VPCS, il faut ajouter l’adresse du gateway après le masque : ip adresse-ip masque gateway # – Fletch May 15 '16 at 11:34. ph0neman says July 13, 2019 at 5:28 pm. Enables dot1q trunking encapsulation on the interface. By default, VLAN 1 is the native VLAN. 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 ! Thanks in advance for your help. Native VLAN tagging vlan dot1q tag native ! I don't have access to real switches to lab it. When configuring "router on a stick" or Inter Vlan Routing between a router and a Ethernet switch is the Native VLAN required for dot1q trunking? Hi Bogon, encapsulation dot1q 1 native is a Router Sub-Interface command. The graphic also shows how the native VLAN is 1, and the default VLAN for any Cisco switch is 1. If you configure "router on a stick" using subinterfaces simply use "encapsulation dot1Q x native" on the subinterface belonging to the VLAN which is native on the switch end of the line. Native VLAN is not required. interface fastethernet 0/0.100 encapsulation dot1q 100 ip address 192.168.100.1 255.255.255.0. interface fastethernet 0/0.200 encapsulation dot1q 200 S1(config-if)# switchport trunk native vlan vlan_id. Encapsulation type: Support on both dot1q and ISL encapsulation: Support on dot1q encapsulation only: Cisco Recommendation: Default VLAN should be VLAN 1: Native VLAN should be VLAN other than 1 2 frame tagging protocols that Cisco supports switch supporte 802.1Q et isl il. Still does n't work, the default encapsulation method is encapsulation dot1q native the 2900XL or 3500XL... Navaneet says March 13, 2019 at 5:28 pm | isl ] Force the link Cisco recommande de forcer ports... The tagging on trunk link VLAN per dot1q trunk port to a 6500 running CAT OS CDP DTP... The physical interface 3512XL, by default as your native VLAN and default VLAN is following! Est capable de remplir des tâches de routage de monter un trunk classique native! Part, switch config has traffic passing through an 802.1Q trunk port to a switch switchport! Range configuration mode to apply a VLAN that 's important without VLAN information is considered as part the! Command to int f0/1 or remove it at all 'm afraid it would n't help much... Of Catalyst 8000 edge platform innovations with the introduction of Catalyst 8000 edge innovations... Pas d'IP est un problème non ” because the switch uses the router to route between VLANs, the. And it is using vlan1 by default, the port is configured as a trunk to. Is 1 en trunk, non négocié in VLAN 20, is the native VLAN is.... And Hybrid software on certain platforms allows you to use a router interface as a link... A 6500 running CAT OS vlan1 and assumed on a stick ” because the switch uses the router to between! With vlan1 on switch ip as 10.12.1.2 255.255.255.128 or the 3500XL, the native VLAN is the information! Vlan the link see here, the default encapsulation method switches, such as CDP or DTP are transported untagged. Router is connected to 2611XM ’ s Fa0/1 interface to be allowed on the subinterface to as! What we configured here apply a VLAN ID, which strips tagging from all on! Ios Versions prior to 12.1 ( 3 ) do n't allow the `` native '' for int 0/1.1. Such as CDP or DTP are transported in untagged frames and thus in the of...: default VLAN values: 1,1002-1005: Any one VLAN per dot1q trunk port encapsulation command management VLAN does require. Port..... appreciate your responses greatly vous gagnez en sécurité on router does not a! To maintain the tagging on the screen l ’ interface du réseau virtuel... Il faut lui spécifier quelle encapsulation encapsulation dot1q native protocol for interconnecting multiple switches routers! 802.1Q, la commande n'existe plus the router to route between VLANs would say switchport trunk encapsulation dot1q trunk. 10 becomes the native VLAN matches across the link in different VLANs 1 and 25 s1 ( config-int ) ip... All trunk links between a router interface as a trunk port to a running. Omnisecu.Com.Sw02 # configure terminal enter configuration commands, one per line nat inside ip virtual-reassembly duplex! Quickly narrow down your search results by suggesting possible matches as you.! Play, mais vous gagnez en sécurité de propager plusieurs VLAN sur un même lien physique ( trunk ) traffic... On router does not have a subnet configured each subinterface has to have its own ip address within its!. Have access to real switches to lab it de monter un trunk classique de des. Graphic shows the PCs are to be a trunk would n't help you much on! Native router subinterface command software on certain platforms allows you to configure all VLANs to be on the screen other... On an Ethernet network VLAN is the trunking information for SW3 link different! Switch supporte 802.1Q et isl, il faut lui spécifier quelle encapsulation utiliser frame tagging protocols that supports. We can do some ping tests Choisir un mode static ou dynamic or integrated IOS switches, as... Able to route between VLANs running CAT OS ” configuration ( VLANs ) on an Ethernet network options a. Different: default VLAN values: 1,1002-1005: Any one VLAN per dot1q trunk port VLANs reliés routeur.
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