Routing protocols are the rules that devices must follow in order to share route information over a network. Everyone needs to share directions so that everything goes where it needs to go. There are two main types of routing protocols: distance-vector and link-state.
The IS-IS routing protocol is a link-state type. It gives every device a full map of the network so they can choose the quickest way to send data. The IS-IS routing protocol is fast, simple, and great for big networks.
Main Types of Intermediate System-to-Intermediate System (IS-IS)
The IS-IS routing protocol comes in two key types: Level 1 and Level 2. Each one has its own role and works in different parts of the network. Here’s what they are:
- Level 1 (L1): This type takes care of routing inside a single area. Devices share info only with others nearby in the same area. They make a map of their local setup and use it to find the best paths. It works well for smaller networks.
- Level 2 (L2): This type connects different areas together. Devices share info across the whole network, not just one area. They help data move between areas, which is perfect for bigger setups with lots of sections.
Some devices can do both Level 1 and Level 2. These Level 1-2 devices tie local areas to the bigger network, keeping everything running smoothly. Each type ensures that data gets where it needs to go without any issue.
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