What does Switchport trunk allowed VLAN do?
The switchport trunk allowed vlan command allows us to specify a subset of the VLANs defined on the switch to be allowed on the interface. This command only takes effect for interfaces that are operating in trunk mode.
Do VLANs have to match for EtherChannel?
You can put anyone, but between both switchports in a Etherchannel must have the same allowed vlans.
What VLANs are allowed by default on a trunk port?
By default, a trunk port sends traffic to and receives traffic from all VLANs. All VLAN IDs, 1 to 4094, are allowed on each trunk. However, you can remove VLANs from the allowed list, preventing traffic from those VLANs from passing over the trunk.
Does Switchport mode trunk allow all VLANs?
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).
How VLANs are allowed in trunk?
perform these steps:
- To restrict the traffic that a trunk carries, issue the switchport trunk vlan-list interface configuration command.
- To add a VLAN to the trunk, issue the switchport trunk allowed vlan add vlan-list command.
- This example shows how to remove VLANs 5 through 10 and 12.
How do I add a VLAN to a port channel trunk?
Procedure
- Log in to the primary Cisco Nexus series switch.
- To run the configuration, type: Switch-A# config terminal.
- To specify the port channel, type: Switch-A(config)# interface port-channel
- To add the VLANs, type: Switch-A(config)# switchport trunk allowed vlan add VLAN_IDs.
Is etherchannel considered to be a Layer 2 or Layer 3 technology?
A layer 3 etherchannel is similar to an interface on a router. The switch won’t “switch” traffic on this interface but route it. Because it’s a layer 3 interface, we configure an IP address on it. If you forget to run the no switchport command on an interface, your etherchannel will be layer 2 instead of layer 3!
What VLANs are allowed across a trunk when the range of allowed VLANs is set to the default value?
What VLANs are allowed across a trunk when the range of allowed VLANs is set to the default value? All VLANs will be allowed across the trunk.
How many ports can be in an EtherChannel?
eight
Each EtherChannel can consist of up to eight compatibly configured Ethernet ports. All ports in each EtherChannel must be configured as either Layer 2 or Layer 3 ports.
How do I allow VLAN in trunk port?
To add a VLAN to the trunk, issue the switchport trunk allowed vlan add vlan-list command. This example shows how to remove VLANs 5 through 10 and 12. Add VLAN 7 back and verify the allowed VLANs on the trunk link.
What is switchport mode trunk?
Switchport trunk means when you have a trunk link, all VLANs are allowed to pass through a trunk link. To configure a trunk on a switch FastEthernet port, use the switchport mode trunk command. This command puts the interface into permanent trunking mode and negotiates to convert the neighboring switch or links into trunk links.
What is a Cisco trunk port?
The term trunk port means different things to diffrent vendors. For example, in Cisco it is a port that uses multiple VLANs normally used to connect two switches together so all vlans traverse the network. It can be used for other devices like ip phones that need more than 1 vlan.
What is the difference between access and trunk?
As for the difference between Trunks and Access ports, a trunk does add dot1q or ISL tags directly to frames and can exist on all or multiple vlans. While an access port only passes traffic from a set vlan but does not modify the frame with a vlan tag.
What is a trunk port?
What does Trunk Port mean? A trunk port is a specific type of port on a network switch that allows data to flow across a network node for multiple virtual local area networks or VLANs. Think of the trunk port as a “bundle” of individual branches or capillaries in a telecom network connection.