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The bridge has three ports. A is connected to bridge port 1, B is connected to bridge port 2, C is connected to bridge port 3. A sends a frame addressed to B to the bridge. The bridge examines the source address of the frame and creates an address and port number entry for host A in its forwarding table. The bridge examines the destination ...
Switches may not bridge network traffic between VLANs, as doing so would violate the integrity of the VLAN broadcast domain. VLANs can also help create multiple layer 3 networks on a single physical infrastructure.
A network switch is a multiport network bridge that uses MAC addresses to forward data at the data link layer (layer 2) of the OSI model. Some switches can also forward data at the network layer (layer 3) by additionally incorporating routing functionality. Such switches are commonly known as layer-3 switches or multilayer switches. [2]
This is known as inter-VLAN routing. On layer-3 switches it is accomplished by the creation of layer-3 interfaces (SVIs). Inter VLAN routing, in other words routing between VLANs, can be achieved using SVIs. [1] SVI or VLAN interface, is a virtual routed interface that connects a VLAN on the device to the Layer 3 router engine on the same device.
This is done by an identifying number for each MSTI. For achieving the task of assigning each bridge to a region, each switch/bridge must compare their MST Configuration Identifiers (Format Selector, Region Name, Revision Level and Configuration Digest), either of them represents VLAN to MSTIs mapping for each bridge.
IEEE 802.1Q, often referred to as Dot1q, is the networking standard that supports virtual local area networking (VLANs) on an IEEE 802.3 Ethernet network. The standard defines a system of VLAN tagging for Ethernet frames and the accompanying procedures to be used by bridges and switches in handling such frames.
Many switches bridge Ethernet traffic based on MAC addresses—not on VLAN IDs. This is called Shared VLAN Learning and is done per 802.1d MAC learning/MAC aging, etc. Should Acme and XYZ use the same MAC addresses in their networks, this will cause problems with the MAC learning, as the assumption in MAC learning is that no two hosts use the ...
IEEE 802.1ah is an amendment to the IEEE 802.1Q networking standard which adds support for Provider Backbone Bridges.It includes an architecture and a set of protocols for routing over a provider's network, allowing interconnection of multiple provider bridge networks without losing each customer's individually defined VLANs.
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