--> IS-IS stands for Intermediate System - Intermediate System.
--> IS-IS protocol is used to provide the communication between the routers.
--> IS-IS protocol works on layer2 whereas all the other routing protocols works on layer 3.
--> IS-IS protocol is most commonly used in Service Provider Networks.
--> IS-IS is a link state Protocol.
--> IS-IS protocol provides very fast convergence and large scalability which allows to be used in MPLS traffic engineering.
--> In ISIS a router can belong to only one area.
--> In ISIS there is no concept of backbone area.
--> ISIS uses NET address similar to Router- ID in OSPF.
--> IS-IS protocol is used to provide the communication between the routers.
--> IS-IS protocol works on layer2 whereas all the other routing protocols works on layer 3.
--> IS-IS protocol is most commonly used in Service Provider Networks.
--> IS-IS is a link state Protocol.
--> IS-IS protocol provides very fast convergence and large scalability which allows to be used in MPLS traffic engineering.
--> In ISIS a router can belong to only one area.
--> In ISIS there is no concept of backbone area.
--> ISIS uses NET address similar to Router- ID in OSPF.
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