Ccie exam fee A brief look at MPLS(2)
For IP packets arriving at the same destination, different forwarding paths can be established according to the requirements of their TOS values to meet their transmission quality requirements. At the same time, through the management of special routes, it can effectively solve the load balancing and congestion problems in the network. Ccie exam fee.When congestion occurs in the network, MPLS can establish new forwarding routes in real time to spread traffic to alleviate network congestion.Ccie exam fee
MPLS switching uses a connection-oriented working mode. The connection-oriented working mode is that information transmission goes through the following three stages: establishing connection, data transmission and tearing down the connection.Ccie exam fee
For MPLS, establishing a connection is a process of forming a label switched path (LSP); Data transmission is the process of forwarding data packets along an LSP; tearing down the connection is the process of releasing the LSP when the communication ends or the fault occurs abnormally.Ccie exam fee
FEC:
Forwarding Equivalence Class, FEC is a group of data packets that are processed in an equivalent manner during the forwarding process.
The FEC can be identified by an address, a tunnel, a COS, or the like.
Currently, only one route corresponds to one FEC in MPLS. Usually one label is assigned the same label on one device.
Label
It is a relatively short, fixed-length, usually only localized identifier (like a mac address), These labels are usually located between the data link layer encapsulation header and the Layer 3 data packet of the data link layer. Ccie exam fees .The label is mapped to the FEC through the binding process, that is, one FEC corresponds to one label.
LSP:
Label exchange channel. An FEC data stream is assigned a deterministic label at a different node, and data forwarding is performed according to these labels. The path taken by the data stream is the LSP.
LSR:
Label Switching Router, the core switch of the MPLS network, provides label switching and label distribution.
LER:
Label Switching Edge Router, at the edge of the MPLS network, the traffic entering the MPLS network is divided into different FECs by the LER, and corresponding labels are requested for these FECs. It provides traffic classification and label mapping, label removal.
With the development of ASIC technology, the speed of route lookup is not a bottleneck that hinders network development. This makes MPLS no longer have obvious advantages in improving forwarding speed.Ccie exam fee
However, MPLS combines the powerful Layer 3 routing function of the IP network with the efficient forwarding mechanism of the traditional Layer 2 network. The forwarding plane adopts a connection-oriented mode, which is very similar to the existing Layer 2 network forwarding mode. These features enable MPLS to easily implement seamless integration of IP and ATM, frame relay and other Layer 2 networks,and also provides better solutions for applications such as Traffic Engineering (TE), Virtual Private Network (VPN), and Quality of Service (QoS).Ccie exam fee
Publisher:IE LAB
publish Website: http://ielab.network
WhatsApp: +8617782638871
Skype:live:ielab.anna
Ccie exam fee A brief look at MPLS
For IP packets arriving at the same destination, different forwarding paths can be established according to the requirements of their TOS values to meet their transmission quality requirements. At the same time, through the management of special routes, it can effectively solve the load balancing and congestion problems in the network. Ccie exam fee.When congestion occurs in the network, MPLS can establish new forwarding routes in real time to spread traffic to alleviate network congestion.Ccie exam fee
MPLS switching uses a connection-oriented working mode. The connection-oriented working mode is that information transmission goes through the following three stages: establishing connection, data transmission and tearing down the connection.Ccie exam fee
For MPLS, establishing a connection is a process of forming a label switched path (LSP); Data transmission is the process of forwarding data packets along an LSP; tearing down the connection is the process of releasing the LSP when the communication ends or the fault occurs abnormally.Ccie exam fee
FEC:
Forwarding Equivalence Class, FEC is a group of data packets that are processed in an equivalent manner during the forwarding process.
The FEC can be identified by an address, a tunnel, a COS, or the like.
Currently, only one route corresponds to one FEC in MPLS. Usually one label is assigned the same label on one device.
Label
It is a relatively short, fixed-length, usually only localized identifier (like a mac address), These labels are usually located between the data link layer encapsulation header and the Layer 3 data packet of the data link layer. Ccie exam fees .The label is mapped to the FEC through the binding process, that is, one FEC corresponds to one label.
LSP:
Label exchange channel. An FEC data stream is assigned a deterministic label at a different node, and data forwarding is performed according to these labels. The path taken by the data stream is the LSP.
LSR:
Label Switching Router, the core switch of the MPLS network, provides label switching and label distribution.
LER:
Label Switching Edge Router, at the edge of the MPLS network, the traffic entering the MPLS network is divided into different FECs by the LER, and corresponding labels are requested for these FECs. It provides traffic classification and label mapping, label removal.
With the development of ASIC technology, the speed of route lookup is not a bottleneck that hinders network development. This makes MPLS no longer have obvious advantages in improving forwarding speed.Ccie exam fee
However, MPLS combines the powerful Layer 3 routing function of the IP network with the efficient forwarding mechanism of the traditional Layer 2 network. The forwarding plane adopts a connection-oriented mode, which is very similar to the existing Layer 2 network forwarding mode. These features enable MPLS to easily implement seamless integration of IP and ATM, frame relay and other Layer 2 networks,and also provides better solutions for applications such as Traffic Engineering (TE), Virtual Private Network (VPN), and Quality of Service (QoS).Ccie exam fee
Publisher:IE LAB
publish Website: http://ielab.network
WhatsApp: +8617782638871
Skype:live:ielab.anna
Ccie exam fee A brief look at MPLS
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