give me configuration command line in ciena 5142 for vlan and virtual switch

Configuring VLANs and virtual switches on a Ciena 5142 involves using the command line interface (CLI). The exact commands can vary based on the software version and specific network configuration. Below is a general example of how to configure a VLAN and a virtual switch on a Ciena 5142 device:

### Step-by-Step Configuration

1. **Access the Device:**
   Connect to the Ciena 5142 via console or SSH.

2. **Enter Global Configuration Mode:**
   ```plaintext
   enable
   configure terminal
   ```

3. **Create a VLAN:**
   For example, to create VLAN 100:
   ```plaintext
   vlan 100
   ```

4. **Assign Ports to the VLAN:**
   Assuming you want to add ports 1/1 and 1/2 to VLAN 100:
   ```plaintext
   interface ethernet-1/1
   switchport mode access
   switchport access vlan 100
   exit
   interface ethernet-1/2
   switchport mode access
   switchport access vlan 100
   exit
   ```

5. **Configure a Virtual Switch:**
   To create a virtual switch (assuming you want to name it `VSW1`):
   ```plaintext
   interface virtual-switch VSW1
   bridge-group 1
   exit
   ```

6. **Attach VLAN to Virtual Switch:**
   Assign VLAN 100 to your virtual switch:
   ```plaintext
   interface virtual-switch VSW1
   vlan 100
   exit
   ```

7. **Save Configuration:**
   Make sure to save your changes:
   ```plaintext
   write memory
   ```

### Example Full Configuration
Here’s how the complete set of commands might look:
```plaintext
enable
configure terminal

vlan 100
exit

interface ethernet-1/1
switchport mode access
switchport access vlan 100
exit

interface ethernet-1/2
switchport mode access
switchport access vlan 100
exit

interface virtual-switch VSW1
bridge-group 1
vlan 100
exit

write memory
```

### Notes:
- Always ensure you're aware of your network topology and requirements before applying configurations.
- The commands can vary between software versions, so check the Ciena 5142 documentation for any version-specific details.
- Consider testing changes in a lab environment before deploying them in production.