In Metro Ethernet links, the traffic rates are not stable always. Sometimes the traffic rates increase, sometimes they decrease. To overcome and manage this issue, some key parameters are used. 
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IS-IS Protocol uses L2 encapsulation Ethernet 802.3/802.2. It do not use Ethernet II. Ethernet II is used for IP traffic. IS-IS Protocol exchanges protocol information by using Link-State PDUs (Protocol 
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IS-IS (Intermediate System to Intermediate System) Protocol was developed as a OSI network protocol, not TCP/IP. So, normally IS-IS Protocol not uses IP address, but it uses NET (Network Entity 
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IS-IS (Intermediate System to Intermediate System Protocol) is a Link-State routing protocol that is developed by ANSI ISO. It is an open standard and classless Interior Gateway Protocol (IGP). IS-IS 
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