What is Switch Trunk Encapsulation Protocol ?
What is the use of Switch port trunk encapsulation dot1q?
switch port trunk encapsulation dot1q sets the encapsulation mode of the trunk interface to the industry standard 802.1Q. switch port trunk encapsulation is l sets the encapsulation mode of the trunk interface to proprietary ISL.
What is Switch port mode trunk used for?
switch port mode trunk: Puts the interface into permanent trunking mode and negotiates to convert the neighboring link into a trunk link. The interface becomes a trunk interface even if the neighboring interface is not a trunk interface. switchport nonegotiate: Prevents the interface from generating DTP frames.
What is Cisco encapsulation dot1q?
IEEE 802.1Q encapsulation is configurable on Ethernet and Ether Channel interfaces. IEEE 802.1Q is a standard protocol for interconnecting multiple switches and routers and for defining VLAN topologies. Use the encapsulation dot1q command in subintre face range configuration mode to apply a VLAN ID to the subinter face.
What are the two Ethernet trunk encapsulation modes?
Trunking Overview Two trunking encapsulations are available on all Ethernet ports: Inter-Switch Link (ISL)—ISL is a Cisco-proprietary trunking encapsulation. 802.1Q—802.1Q is an industry-standard trunking encapsulation. You can configure a trunk on a single Ethernet port or on an EtherChannel.
What is the value of the native VLAN?
Finally, we can conclude that the basic purpose of native VLAN is to serve it as a common identifier on opposing ends of a trunk link. To carry untagged traffic which is generated by a computer device attached to a switch port, which is configured with the native VLAN.
What does Switchport trunk native VLAN do?
The switchport trunk native vlan command specifies the native (untagged) VLAN for a Layer 2 interface operating in trunk mode on a Cisco IOS device. This command only takes effect for interfaces that are operating in trunk mode.
Why we use router on a stick?
ROUTER-ON-A-STICK, also known as a “one-armed router” is a method for running multiple VLANs over a single connection in order to provide inter-VLAN routing without the need of a Layer 3 switch. Essentially the router connects to a core switch with a single interface and acts as the relay point between networks.
How does DTP work?
The Dynamic Trunking Protocol (DTP) is a proprietary networking protocol developed by Cisco Systems for the purpose of negotiating trunking on a link between two VLAN-aware switches, and for negotiating the type of trunking encapsulation to be used. It works on Layer 2 of the OSI model.
What is advantage of native VLAN?
Native VLAN: The native VLAN is the one into which untagged traffic will be put when it’s received on a trunk port. This makes it possible for your VLAN to support legacy devices or devices that don’t tag their traffic like some wireless access points and simply network attached devices.
What is a Cisco trunk port?
The trunk links are generally used to pass the VLAN information across the switches. The port that is used on a Cisco switch is either a trunk port or an access port. The trunk port is a default member that is common to all VLAN as a result they carry traffic for all the VLANs.
What does the command “switchport mode access” do?
switchport mode access – Always forces that port to be an access port with no VLAN tagging allowed EXCEPT for the voice vlan. DTP is not used and a trunk will never be formed. switchport nonegotiate – turns off DTP and forces the interface into a trunk.
What is encapsulation command?
IEEE 802.1Q encapsulation is configurable on Ethernet and EtherChannel interfaces. IEEE 802.1Q is a standard protocol for interconnecting multiple switches and routers and for defining VLAN topologies. Use the encapsulation dot1q command in subinterface range configuration mode to apply a VLAN ID to the subinterface.
