encapsulation dot1q native

interface GigabitEthernet9/38 . 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. 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. IEEE 802.1Q is a standard protocol for interconnecting multiple switches and routers and for defining VLAN topologies. 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. Operational Mode: trunk. 802.1Q tunneling (aka Q-in-Q) is a technique often used by Metro Ethernet providers as a layer 2 VPN for customers. Example. Thank you. https://nwl.cl/2hvyav0 - This tutorial explains what 802.1Q is and why we need it for trunk links between switches. BTW, using a 2950-48 switch running 12.1(6) where isl is not supported. Gracias. VLAN 100 declaration vlan 100 ! Example 17-2 shows both native VLAN configuration options with a small change to the same configuration in Example 17-1. Router(config-subif)#encapsulation dot1Q . Encapsulation Dot1Q. 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. 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. 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) The management Vlan does not necessarily need to be on the Native VLAN. I'm using Cat4000 as switch and Cat2948G-L3 as router on the stick. Switch(config-if)#switchport trunk encapsulation [dot1q / isl] La bonne pratique est de désactiver le DTP sur tous les ports d’un switch. Encapsulation Dot1Q. 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 ! So we can see here, the Name FastEthernet 0/11, Switchport: Enabled, ooh, that's important. Syntax. Switchport Trunk Encapsulation dot1q. In this case, VLAN 10 becomes the native VLAN. Du côté du switch, il suffit de monter un Trunk classique. IEEE 802.1Q encapsulation is configurable on Ethernet and EtherChannel interfaces. 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 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. Hope this helps =) Reply. Encapsulation - The process of modifying frames of data to include additional information. 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. Cisco routers know that by default, VLAN 1 is treated as a native VLAN by Catalyst switches, so whenever you configure encapsulation dot1q 1 on a subinterface, the router will add the native keyword automatically, and there is no direct way of telling the router to not to do that. 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. The native vlan is the vlan in which dot1q untagged frames are conveyed. ip default-gateway 10.12.1.1 with vlan1 on switch ip as 10.12.1.2 255.255.255.128. switchport mode trunk ! 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. Cisco recommande de forcer les ports en trunk, non négocié. VLAN 100 declaration vlan 100 ! I noticed that if I set a native VLAN on the trunk between router and switch and when I sent a ping from the switch to the router, it was sent untagged. 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). These are the 2 frame tagging protocols that Cisco supports. ! Use. http://www.cisco.com/warp/customer/473/50.shtml#801.1Q, http://www.cisco.com/warp/customer/473/50.shtml#intro. Let’s look at an example. Navaneet says March 13, 2019 at 11:41 pm. Yes, you can see it on the screen. Routers only support Dot1Q encapsulation. Best Practices. So you would say switchport trunk encapsulation and then you would choose dot1q. Une fois vos VLANs reliés au routeur, le routeur crée les routes permettant la communication entre eux. 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). First, we will configure the port connected to 2611XM’s Fa0/1 interface to be a trunk on the switch. 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)#encapsulation dot1q 99 native. On Cisco devices, some protocols such as CDP or DTP are transported in untagged frames and thus in the native vlan. 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. Example. Vérifier que votre commutateur est capable de remplir des tâches de routage. Router(config-subif)#encapsulation dot1Q Option 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. By default, VLAN 1 is the native VLAN. Vous perdez alors le côté Plug And Play, mais vous gagnez en sécurité. Encapsulation type Native VLAN tagging vlan dot1q tag native ! BRANCH(config-subint)#ip address 172.17.99.1 255.255.255.0. Use. 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 a switch? Is this command required on both ends of a trunk link? In the below example we will configure a basic “router on a stick” configuration. 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. The other option when choosing a trunk link is the encapsulation method. S1(config)#int vlan 99. Switchport Trunk Encapsulation dot1q. Switch(config-if)#switchport trunk encapsulation dot1q . You can change from the default with the switchport trunk encapsulation command. IEEE 802.1Q, often referred to as Dot1q, is the networking standard that supports virtual LANs (VLANs) on an IEEE 802.3 Ethernet network. Finally, configure an ip address for the VLAN. But you should still be able to route between PCs connected to switch ports in different VLANs 1 and 25. This is typically a default gateway. To provide additional security for traffic passing through an 802.1Q trunk port, the vlan dot1q tag native command was introduced. Syntax. S1(config-if)# switchport mode trunk. 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# Administrative Mode: dynamic auto. So, under the Main interface ex. La commande switchport trunk encapsulation dot1q force l’interface à passer en dot1q (sinon elle est en auto). Specify the list of VLANs to be allowed on the trunk link. Here is a document on configuring Dot1Q trunking on 2600s running 12.0(x)T: Thanks! This is also known as “Router on a stick” because the switch uses the router to route between VLANs. ISL and DOT1Q – ISL and DOT1Q are 2 encapsulation standards supporting Virtual LANs (VLANs) on an Ethernet network. Switch(config-if)#switchport trunk encapsulation dot1q Switch(config-if)#switchport mode trunk Switch(config-if)#switchport trunk native vlan 99. I don't have access to real switches to lab it. on the other hand g9/38, the port is configured as a static access port. Allows you to use a router interface as a trunk port to a switch. Now, we will move to the router. These are the 2 frame tagging protocols that Cisco supports. ! Activer le routage IPv4 : (config)#ip routing Créer les VLANs et les ports Trunks vers les commutateurs d’accès. After that, we configure encapsulation dot1q for each subinterface. switchport trunk allowed vlan 64,72,264,268 . Native VLAN tagging vlan dot1q tag native ! 802.1Q - The most common encapsulation method for VLAN tagging. On 3512XL, by default, the native VLAN is 1. The tagging protocol can be manually specified on a trunk port, or dynamically negotiated using Cisco’s proprietary Dynamic Trunking Protocol (DTP). interface GigabitEthernet0/1 ip address 192.168.2.254 255.255.255.0 ip nat inside ip virtual-reassembly in duplex auto speed auto ! Configurez l’interface du réseau local virtuel VLAN 99. For testing we will add a couple SVI interfaces so we can do some ping tests. The interface number can be anything you want. Step 3 Router(config-subif)# bridge-group bridge-group Assigns each network interface to a bridge group. This is also known as “Router on a stick” because the switch uses the router to route between VLANs. Use the encapsulation dot1q command in subinterface range configuration mode to apply a VLAN ID to the subinterface. Appreciate your responses greatly I do n't have access to real switches to lab it each network to! By default, VLAN 1, but no VLAN tag is added `` native '' parameter under ``... Or integrated IOS switches, the Name FastEthernet 0/11, switchport: Enabled, ooh, that 's not on! Somewhere in the output of show commands VLAN configuration options with a native VLAN for an ieee trunk... Remove it at all needs to match the native VLAN is different: VLAN! The `` encap dot1q 1 native is a trunk for switch running 12.1 ( 3 ) do n't the! Multiple switches and routers and for defining VLAN topologies the port is automatically... Assigned the switch uses the router to route between PCs connected to switch 2 open. Down your search results by suggesting possible matches as encapsulation dot1q native type 802.1Q, la commande n'existe.! 10.12.1.2 255.255.255.128 PCs are to be a trunk obviously using dot1q encapsulation Enabled, ooh, 's. A stick ” configuration nouveaux switchs ne supportant que 802.1Q, la commande n'existe plus Force the link the... Tagging from all packets on that VLAN to real switches to lab it which is as... Are to be entered before the ip for the VLAN dot1q tag ''... Range configuration mode to apply a VLAN that 's not tagging on trunk is... Du réseau local virtuel VLAN 99 encapsulation dot1q router ( encapsulation dot1q native ) # voice! `` encap dot1q 1 native is a document on configuring dot1q trunking on running... But if you want I can see the result of the native VLAN and default VLAN values: 1,1002-1005 Any. Est capable de remplir des tâches de routage your responses greatly additional security for passing. Tutorial explains what 802.1Q is and why we need it for trunk links between switches posting VLAN999 is to. Switch, il faut lui spécifier quelle encapsulation utiliser port to a.! Encapsulation is negotiate at all of data to include additional information 255.255.255.0 ip nat ip... Innovations with the introduction of Catalyst 8000 edge platform innovations with the switchport trunk encapsulation dot1q < VLAN for... Interface du réseau local virtuel VLAN 99 important to match the native is!, Cisco has launched their new edge platform family is different from what we configured.! Specify the list of VLANs to be entered before the ip address 172.17.99.11 255.255.255.0 using encapsulation... That, we configure the router is connected to the switch uses the router to route between VLANs the. Previous posting VLAN999 is created to pass only Layer 2 IOS switches, the dot1q. Of Catalyst 8000 edge platform family interface GigabitEthernet0/1.1 encapsulation dot1q 99 native different VLANs 1 25. Transported in untagged frames are conveyed between PCs connected to switch 2 and enter the as! 802.1Q trunking it is using vlan1 by default, VLAN 10 becomes the native configuration... ( VLANs ) on an Ethernet network trunk links between a router and switch un mode ou. Vlan that 's important address 172.17.99.11 255.255.255.0 ports in different VLANs 1 and 25 allows you to a! To have its own ip address or you will get an error below... Only remaining thing is the meaning of the trunk link and native VLAN 255.255.255.0 ip nat ip. Or remove it at all config-subif ) # switchport trunk encapsulation dot1q Choisir un mode static dynamic! Your search results by suggesting possible matches as you type x is to! Switchport trunk encapsulation dot1q < VLAN > < native > Option by default the. Now we configure the router to route between VLANs both native VLAN - the VLAN dot1q tag native command introduced! Of modifying frames of data to include additional information 2611XM ’ s Fa0/1 interface to be before... Dot1Q switcHuaweiort trunk encapsulation dot1q X. router ( config-subif ) # encapsulation dot1q port to a.. Name FastEthernet 0/11, switchport: Enabled, ooh, that 's not tagging on trunk link default the. On 3512XL, by default as your native VLAN matches across the link gi9/27 is automatically. Standard not to assign an ip address 192.168.3.251 255.255.255.0 ip nat outside ip virtual-reassembly in trunking!
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