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Multilayer Switch Configuration

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# Multilayer Switch Configuration
This playbook describes the essential steps for configuring multilayer switches. It includes the setting up of layer 3 switching functionalities, configuring inter-VLAN routing, and establishing various IP services.

### Step 1: Preparation
Gather all necessary information such as IP addresses, subnet masks, VLAN IDs, and any relevant routing protocols that will be used.

### Step 2: Access Switch
Connect to the switch using SSH, Telnet, or a console connection to access the switch&#x27;s command-line interface (CLI).

### Step 3: Enter Privileged Mode
Enter privileged EXEC mode by typing `enable` in the CLI and providing the required password.

### Step 4: Configuration Mode
Access the global configuration mode by typing `configure terminal` or `conf t` from the privileged EXEC mode.

### Step 5: Configure VLANs
Create VLANs as needed by using the `vlan &lt;VLAN_ID&gt;` command and provide a name using the `name &lt;VLAN_NAME&gt;` command within the VLAN configuration mode.

### Step 6: Assign Switchports
Assign switch ports to VLANs using the `interface &lt;INTERFACE_ID&gt;` command followed by the `switchport access vlan &lt;VLAN_ID&gt;` command in their respective interface configuration modes.

### Step 7: Configure SVIs
Set up Switched Virtual Interfaces (SVIs) for inter-VLAN routing using the `interface vlan &lt;VLAN_ID&gt;` command, assigning IP addresses with `ip address &lt;IP_ADDRESS&gt; &lt;SUBNET_MASK&gt;` and enabling them with `no shutdown`.

### Step 8: Enable Routing
Enable layer 3 routing capabilities by typing the `ip routing` command in the global configuration mode.

### Step 9: IP Routing Protocol
Configure an IP routing protocol such as OSPF or EIGRP if required, using the router protocol commands and specifying networks with network statements.

### Step 10: Verify Configuration
Verify the configuration is correct and operational using verification commands such as `show ip route`, `show ip interface brief`, and `show vlan`.

### Step 11: Save Configuration
Save the running configuration to the startup configuration file to ensure changes are persistent after a reboot by using the `write memory` or `copy running-config startup-config` commands.

## General Notes

### Backups
Always backup the current switch configuration before making changes to avoid loss of service in case of misconfiguration.

### ACLs
Consider implementing Access Control Lists (ACLs) for security purposes to control traffic flow between VLANs.

### Testing
After configuration, thoroughly test connectivity and routing between VLANs to ensure the network operates as intended.