switchport mode dot1q tunnel – vlan dot1q tag native
· We can use the command show dot1q-tunnel on the ISP switches to get a list of all interfaces configured as 802,1Q tunnels: S1# show dot1q-tunnel dot1q-tunnel mode LAN Ports —– Fa0/1 Fa0/3 Now that our tunnel configurations have been completed, each customer VLAN has transparent end-to-end connectivity between sites,
Solved: DOT1Q Tunnelling Q in Q selectiv vlan
· Packets received from a tunnel port are forwarded based only on Layer 2 information, If routing is enabled on a switch virtual interface SVI that includes tunnel ports, untagged IP packets received from the tunnel port are recognized and routed by the switch, Customers can access the Internet through the native VLAN, If this access is not needed, you should not configure SVIs on VLANs that include tunnel ports,
IT Blogtorials: Dot1Q Tunnel / q-in-q Tunneling
Cisco, No dot1q tunnel mode on switchport
switchport mode dot1q tunnel
VLAN Configuration Commands
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· By the way, all interface configuration commands are available in any switchport mode, just error can occurs: config#int gi 1/1 config-if#no switchport config-if#switchport mode dot1q-tunnel Command rejected: Te5/5 is not a switching port, And all show command available:
Switchport mode dot1q-tunnel interface level command is used to configure interface carrying Q-in-Q frames, While configuring the Q-in-Q the MTU needs to be carefully addressed, as the frame coming from customer may already contain 1500 bytes and by implementing Q-in-Q adds additional 4 byte in the frame,
| Cisco Learning Network |
| Command rejected: An interface whose trunk encapsulation |
| If Native VLAN is Not Used Then , – Cisco |
| QinQ and MTU size – Cisco |
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· Dot1Q tunnel or q-in-q tunneling is a technique generally used by service providers to extend customer’s VLANs to different locations It is done by encapsulating the customer VLAN inside another 802,1q encapsulation and because of this we must increase the system mtu on the service provider switches to something greater than 1500 In this blogtorial we will take a look at a very simple topology with easy to …
Utilisation du Q-in-Q – Norme 8021ad pour le transport
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The following example shows how to enable Dot1q tunnel in the global configuration mode, Switch_config#dot1q-tunnel 1,1,4 switchport pvid Syntax To configure VLAN of the access-mode port, run switchport pvid vlan-id, switchport pvid vlan-id no switchport pvid Parameters Parameters Description
The switchport mode is set to dot1q-tunnel, When traffic arrives on this port, an extra VLAN tag is added, even if there is already one there, Example – ISP1, vlan 123 name S-TAG interface GigabitEthernet0/1 description ** To ISP2 ** switchport trunk encapsulation dot1q switchport mode trunk mtu 1504 interface GigabitEthernet0/3 description ** To Customer ** switchport access vlan 123
802,1Q Tunneling Q-in-Q Configuration
dot1q tunnel
The magic bullet that makes the etherchannel possible is the l2protocol-tunnel command and specifying PAgP or LACP, The configuration for SW3 is similar: SW3config#interface fastEthernet 1/0/23 SW3config-if#switchport access vlan 100 SW3config-if#switchport mode dot1q-tunnel SW3config-if#l2protocol-tunnel point-to-point pagp
· Trunks require no special configuration to carry tunnel VLANs, 4,Tunnel ports are not trunks, Any commands to configure trunking are inactive while the port is configured as a tunnel port, With Reference to Point #4, The ports that are enabled with “switchport mode dot1q-tunnel” will …
Temps de Lecture Estimé: 2 mins
EtherChannel over 802,1Q Tunneling
switchport mode dot1q-tunnel Configures the interface as a tunnel nontrunking port to be connected in an asymmetric link with an IEEE 802,1Q trunk port, The IEEE 802,1Q tunneling is used to maintain customer VLAN integrity across a service provider network,
IEEE 802,1Q Tunneling
· Lors de la configuration de base des trunks, j’ai utilisé la commande « switchport trunk encapsulation dot1q », Cette commande n’existe que sur les switches qui supportent à la fois dot1q et ISL, Si vous testez cette configuration sur des modèles comme les WS-C2950 ou WS-C2960, cette commande n’est pas nécessaire, ils ne supportent que dot1Q,
switchport access vlan 55 switchport mode dot1q-tunnel Dans cet exemple l’interface interne du site va encapsuler grâce à la commande switchport mode dot1q-tunnel dans le super-VLAN de tag 55, toutes les trames taggées comportant n’importe quel tag interne qui devra être choisi en …
VLAN
Q-in-Q Configuration
The switchport mode dot1q-tunnel command tells the switch to tag the traffic and switchport access vlan command is required to specify the Q-in-Q VLAN of 123, Make sure that VLAN 123 is available on SW1, SW2 and SW3, By assigning the interfaces above to this VLAN it was automatically created on SW1 and SW2 but I also have to make sure that SW3 has VLAN 123 in its database:
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| Configuring Q-in-Q VLAN Tunnels | www,cisco,com |
| IEEE 802,1Q Tunneling QinQ and L2PT on L2 – Cisco | www,cisco,com |
| How to configure Q-in-Q Tunneling in Cisco – LetsConfig | www,letsconfig,com |
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Difference between dot1q and Q-in-Q
Configuration avancée de trunks dot1q