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MpLS is a protocol used for traffic forwarding.
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Work in layer 2.5 , between Ethernet and routing layers.
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Use labels to forward traffic.
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LER is a router receive traffic from client devices and classify the traffic based on different attributes.
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LSR switch the traffic using labels and forward it to next hop.
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LER works with IPs and labels.
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LSR use only labels to forward the traffic.
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GMPLS works similar to MpLS and add OAM control to help in network troubleshooting and operation.
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GMPLS used to transport all types of traffic like TDM , WDM and IP traffic.
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MpLS label inserted between IP header and. Ethernet header.
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MpLS header contain label + TTL + Cos + BOS.
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TTL is 8 bits , time to live , used to prevent loops.
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Label is 20 bits , used to forward traffic.
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COS is class of service and used to identify type of traffic and class and priority.
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BOS is bottom of stack , used to indicate whether there’s multiple labels (for VPN applications and traffic engineering).
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