# Adding Routers and Components - Step by Step Guide

Adding new routers and components to a Node must be done in the correct order. The following constraints apply:

1. A Node Owner cannot add a Router that is not whitelisted at the protocol level
2. A Node Owner cannot add a component unless both:
   1. The component is whitelisted on a Router by the RegistryOwner
   2. This specific Router has already been added to the Node by the owner

#### 1. Protocol Owner Actions

```solidity
// Must happen first - whitelist router at protocol level
registry.setRegistryType(routerAddress, RegistryType.ROUTER, true);
```

#### 2. Registry Owner Actions

```solidity
// Whitelist component on specific router
router.setWhitelistStatus(componentAddress, true);
```

#### 3. Node Owner Actions

```solidity
// First add router to node
node.addRouter(routerAddress);

// Then add component that uses that router
node.addComponent(
    componentAddress,    // component address
    targetWeight,       // e.g., 0.7 ether for 70%
    maxDelta,          // acceptable deviation
    routerAddress      // must match router added above
);
```

If steps are performed out of order:

* Adding component before router: Reverts with `RouterNotApproved`
* Adding component before router whitelist: Reverts with `NotWhitelisted`
* Adding router before protocol whitelist: Reverts with `NotWhitelisted`
* Adding component before component whitelist: Reverts with `NotWhitelisted`


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