Clearing the DHCPv6 delegated prefixes and packet counters

Use the clear commands to clear the DHCPv6 delegated prefixes and packet counters.

Clear the DHCPv6 delegated prefixes using the clear command at the privileged EXEC level.
```
device# clear ipv6 dhcp-relay delegated-prefixes vrf VRF1
```
This command clears the DHCPv6 delegated prefixes for VRF1. If you do not provide the VRF name, the information for the default VRF is cleared. You can also use the all or interface keywords. Optionally, you can also clear a specific DHCPv6 delegated prefix.

Clear all the DHCPv6 packet counters using the clear command at the privileged EXEC level.
```
device# clear ipv6 dhcp-relay statistics
```