Defines the prefix used by this border relay for the 6rd domain, e.g. 2001:db8:/32. This prefix must also be configured on all associated 6rd clients.
- SNMP ID:
 - 2.70.1.2.4
 - Console path:
 - Setup > IPv6 > Tunnel > 6rd-Border-Relay
 - Possible values:
 Max. 16 characters from A-Z][a-z][0-9]:/
- Default:
 - empty