What is VLAN encapsulation?
What is VLAN encapsulation? When a switch port is configured to function as a trunk port, it adds unique identification tags – either 802.1Q tags or Inter-Switch Link (ISL) tags to the frames as they move between switches.
What is encapsulation dot1q Cisco?
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.
What type of Cisco encapsulation is used for frame tagging across trunked links?
Two trunking protocols are usually used today for frame tagging: Inter-Switch Link (ISL) – Cisco’s proprietary VLAN tagging protocol. IEEE 802.1q – IEEE’s VLAN tagging protocol.
What is the purpose of the encapsulation dot1q command?
Summary of Commands switchport trunk encapsulation dot1q sets the encapsulation mode of the trunk interface to the industry standard 802.1Q. switchport trunk encapsulation isl sets the encapsulation mode of the trunk interface to proprietary ISL.
What is Vxlan used for?
VXLAN is an encapsulation protocol that provides data center connectivity using tunneling to stretch Layer 2 connections over an underlying Layer 3 network. In data centers, VXLAN is the most commonly used protocol to create overlay networks that sit on top of the physical network, enabling the use of virtual networks.
What is ISL encapsulation?
ISL is Cisco’s VLAN encapsulation protocol and is supported only on some Cisco equipment over the Fast and Gigabit Ethernet links. With ISL, an Ethernet frame is encapsulated with a header that transports VLAN IDs between switches and routers. With IEEE 802.1Q the tag is internal.
What is encapsulation in Cisco?
The term encapsulation is used to describe a process of adding headers and trailers around some data. This process can be explained with the four-layer TCP/IP model, with each step describing the role of the layer. the Network Access layer is the only layer that adds both a header and a trailer. …
What is second dot1q?
Router(config-subif)# encapsulation dot1q 100 second-dot1q 200. (Required) Enables the 802.1Q encapsulation of traffic on a specified subinterface in a VLAN. • Use the second-dot1q keyword and the vlan-id argument to specify the VLAN tags to be terminated on the subinterface.
What is VLAN tagging and untagging?
VLAN-enabled ports are generally categorized in one of two ways, tagged or untagged. These may also be referred to as “trunk” or “access” respectively. The purpose of a tagged or “trunked” port is to pass traffic for multiple VLAN’s, whereas an untagged or “access” port accepts traffic for only a single VLAN.
What is meant by encapsulation?
Encapsulation in OOP Meaning: In object-oriented computer programming languages, the notion of encapsulation (or OOP Encapsulation) refers to the bundling of data, along with the methods that operate on that data, into a single unit.
