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Understanding Layer 2 Vpn Layer 2 Là Gì, Understanding Layer 2 Vpn

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A virtual private network (VPN) is a secure way to lớn connect remote devices or networks over the internet. VPNs can use different methods lớn establish & maintain the connection, such as encryption, authentication, & tunneling. One of the common tasks that VPNs perform is bridging, which allows devices on different networks khổng lồ communicate as if they were on the same network. However, VPN bridging can also pose some challenges & require some trade-offs. In this article, we will explore the benefits & drawbacks of layer 2 và layer 3 VPN bridging, & how lớn choose the best option for your needs.

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Layer 2 VPN bridging operates at the data link layer of the OSI model, which is responsible for transferring data between adjacent nodes on a network. Layer 2 VPN bridging creates a virtual Ethernet switch that connects devices on different networks as if they were on the same LAN. This allows devices lớn use their native protocols and addresses, & to broadcast and multicast traffic. Layer 2 VPN bridging is useful for applications that require low latency, high performance, or seamless integration, such as voice over IP, video clip conferencing, or network virtualization.

However, layer 2 VPN bridging also has some disadvantages, such as scalability, security, & complexity. Layer 2 VPN bridging can consume more bandwidth và resources than layer 3 VPN bridging, because it has khổng lồ carry all the traffic from the source network, including unnecessary or unwanted packets. Layer 2 VPN bridging also exposes more information about the source network, such as MAC addresses, VLAN tags, or ARP requests, which can pose a security risk or cause conflicts. Layer 2 VPN bridging also requires more configuration và management, because it has lớn handle issues such as loop prevention, spanning tree protocol, or MAC address learning.

Layer 3 VPN bridging operates at the network layer of the OSI model, which is responsible for routing data between different networks. Layer 3 VPN bridging creates a virtual router that connects devices on different networks as if they were on the same WAN. This allows devices to use different protocols and addresses, and to filter và optimize traffic. Layer 3 VPN bridging is useful for applications that require scalability, security, or flexibility, such as internet access, site-to-site connectivity, or network segmentation.

However, layer 3 VPN bridging also has some drawbacks, such as compatibility, performance, & overhead. Layer 3 VPN bridging can limit the functionality of some applications that rely on layer 2 features, such as broadcast và multicast traffic, VLAN tags, or MAC addresses. Layer 3 VPN bridging can also introduce some latency & degradation in the quality of service, because it has to encapsulate và decapsulate packets, perform encryption & decryption, and apply routing and filtering rules. Layer 3 VPN bridging also adds some overhead khổng lồ the packets, because it has to include additional headers & trailers for the VPN tunnel.

When deciding which type of VPN bridging is better for a given scenario, there is no single answer; however, some guidelines can be used khổng lồ inform the decision. Factors such as the form size and topology of networks to lớn bridge, the type and volume of traffic to transmit, desired security & privacy levels, performance and quality of service expectations, budget and resources available, and ease và flexibility of configuration và management should all be taken into account. Generally speaking, layer 2 VPN bridging is best for extending a LAN across different locations or for applications that need layer 2 features. On the other hand, layer 3 VPN bridging is preferable for connecting networks with different protocols or addresses or for applications that need layer 3 features.

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Type of data being transferred can be a factor in choosing Layer 2 or 3 VPN connections i.e. Personnel Identifiable Information (PII), Personnel Health Information, or classified information. These types of information tend to use a Layer 3 VPN.

With L2TP you can bridge to lớn the same subnet in ingress good for RAS and with L3 you can connect lớn a different network ideal for ACL filtering from the source khổng lồ ingress filtering

On EX9200 switches, graceful Routing Engine switchover(GRES), nonstop active routing (NSR), và logical systems are notsupported on Layer 2 VPN configurations. Layer 2 VPN is not supportedon the EX9200 Virtual Chassis.

As the need to link different Layer 2 services to lớn one anotherfor expanded service offerings grows, Layer 2 Multiprotocol Label
Switching (MPLS) VPN services are increasingly in demand.

Implementing a Layer 2 VPN on a router is similar khổng lồ implementinga VPN using a Layer 2 technology such as Asynchronous Transfer
Mode (ATM) or Frame Relay. However, for a Layer 2 VPN on a router,traffic is forwarded to the router in a Layer 2 format. It iscarried by MPLS over the service provider’s network, & thenconverted back khổng lồ Layer 2 format at the receiving site. You canconfigure different Layer 2 formats at the sending và receivingsites. The security và privacy of an MPLS Layer 2 VPN are equalto those of an ATM or Frame Relay VPN. The service provisioned with
Layer 2 VPNs is also known as Virtual Private Wire
Service (VPWS).

On a Layer 2 VPN, routing occurs on the customer’srouters, typically on the customer edge (CE) router. The CE routerconnected lớn a service provider on a Layer 2 VPN must selectthe appropriate circuit on which lớn send traffic. The provider edge(PE) router receiving the traffic sends it across the service provider’snetwork to lớn the PE router connected lớn the receiving site. The PE routersdo not need to lớn store or process the customer’s routes; theyonly need khổng lồ be configured lớn send data khổng lồ the appropriate tunnel.

For a Layer 2 VPN, customers need to lớn configure their ownrouters to lớn carry all Layer 3 traffic. The service provider needsto know only how much traffic the Layer 2 VPN will need khổng lồ carry.The service provider’s routers carry traffic between the customer’ssites using Layer 2 VPN interfaces. The VPN topology is determinedby policies configured on the PE routers.

Customers need to lớn know only which VPN interfaces connect towhich of their own sites. Figure 1 illustratesa Layer 2 VPN in which each site has a VPN interface linked toeach of the other customer sites.

Service providers vày not have lớn invest in separate Layer 2equipment to provide Layer 2 VPN service. A Layer 2MPLS VPN allows you to provide Layer 2 VPN service over an existing
IP & MPLS backbone.

You can configure the PE router to run any Layer 3protocol in addition to the Layer 2 protocols.

Customers who prefer lớn maintain control over most ofthe administration of their own networks might want Layer 2 VPNconnections with their service provider instead of a Layer 3VPN.

Because Layer 2 VPNs use BGP as the signaling protocol, they have a simpler design and requireless overhead than traditional VPNs over Layer 2 circuits. BGP signalingalso enables autodiscovery of Layer 2 VPN peers. Layer 2 VPNs aresimilar to BGP or MPLS VPNs and VPLS in many respects; all three types of services employ BGP for signaling.

Understanding Layer 2 Vpn Layer 2 Là Gì, Understanding Layer 2 Vpn

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