Networking : Multiprotocol Label Switching [MPLS] Overviews
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Networking : Multiprotocol Label Switching
Networking : Multiprotocol Label Switching [MPLS] Overviews
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Multiprotocol Label Switching (MPLS) is a type of data-carrying technique for high-performance telecommunications networks. MPLS directs data from one network node to the next based on short path labels rather than long network addresses, avoiding complex lookups in a routing table. The labels identify virtual links (paths) between distant nodes rather than endpoints. MPLS can encapsulate packets of various network protocols, hence its name "multiprotocol". MPLS supports a range of access technologies, including T1/E1, ATM, Frame Relay, and DSL.
MPLS allows most data packets to be forwarded at Layer 2 -- the switching level -- rather than having to be passed up to Layer 3 -- the routing level. For this reason, it is often informally described as operating at Layer 2.5.
MPLS was created in the late 1990s as a more efficient alternative to traditional IP routing, which requires each router to independently determine a packet's next hop by inspecting the packet's destination IP address before consulting its own routing table. This process consumes time and hardware resources, potentially resulting in degraded performance for real-time applications such as voice and video.
Components of MPLS
One of the defining features of MPLS is its use of labels -- the L in MPLS. Sandwiched between Layers 2 and 3, a label is a four-byte -- 32-bit -- identifier that conveys the packet's predetermined forwarding path in an MPLS network. Labels can also contain information related to quality of service (QoS), indicating a packet's priority level.
MPLS labels consist of four parts:
Label value: 20 bits
Experimental: 3 bits
Bottom of stack: 1 bit
Time to live: 8 bits
For More Details
https://searchnetworking.techtarget.c...
https://en.wikipedia.org/wiki/Multipr...
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Multiprotocol Label Switching (MPLS) is a type of data-carrying technique for high-performance telecommunications networks. MPLS directs data from one network node to the next based on short path labels rather than long network addresses, avoiding complex lookups in a routing table. The labels identify virtual links (paths) between distant nodes rather than endpoints. MPLS can encapsulate packets of various network protocols, hence its name "multiprotocol". MPLS supports a range of access technologies, including T1/E1, ATM, Frame Relay, and DSL.
MPLS allows most data packets to be forwarded at Layer 2 -- the switching level -- rather than having to be passed up to Layer 3 -- the routing level. For this reason, it is often informally described as operating at Layer 2.5.
MPLS was created in the late 1990s as a more efficient alternative to traditional IP routing, which requires each router to independently determine a packet's next hop by inspecting the packet's destination IP address before consulting its own routing table. This process consumes time and hardware resources, potentially resulting in degraded performance for real-time applications such as voice and video.
Components of MPLS
One of the defining features of MPLS is its use of labels -- the L in MPLS. Sandwiched between Layers 2 and 3, a label is a four-byte -- 32-bit -- identifier that conveys the packet's predetermined forwarding path in an MPLS network. Labels can also contain information related to quality of service (QoS), indicating a packet's priority level.
MPLS labels consist of four parts:
Label value: 20 bits
Experimental: 3 bits
Bottom of stack: 1 bit
Time to live: 8 bits
For More Details
https://searchnetworking.techtarget.c...
https://en.wikipedia.org/wiki/Multipr...
6 سال پیش
در تاریخ 1397/06/09 منتشر شده
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