It should be straightforward for the DRB to send, within one Hello,
   the appointments for several dozen VLAN IDs or several dozen blocks
   of contiguous VLAN IDs.  Should the VLANs that the DRB wishes to
   appoint be inconveniently distributed (for example the proverbial
   case where the DRB RB1 wishes to appoint RB2 forwarder for all even-
   numbered VLANs and appoint RB3 forwarder for all odd-numbered VLANs)
   the following method may be used:
      The network manager normally controls what VLANs are enabled on an
      RBridge port.  Thus, the network manager can appoint an RBridge
      forwarder for an arbitrary set of scattered VLANs by enabling only
      those VLANs on the relevant port (or ports) and then having the
      DRB send an appointment that appears to appoint the target RBridge
      forwarder for all VLANs.  However, for proper operation and inter-
      RBridge communication, the Designated VLAN for a link SHOULD be
      enabled on all RBridge ports on that link, and it may not be
      desired to appoint the RBridge forwarder for the Designated VLAN.
      Thus, in the general case, it would require two appointments,
      although it would still only require one appointment if the
      Designated VLAN were an extreme low or high value such as VLAN
      0xFFE or the default VLAN 1.