Registry: BGP: MCAST-VPN Route Types

Values may be assigned from one of several ranges:

- Range 0x01-0x3f: Generic/PIM Range. Values are assigned from
this range when the NLRI format associated with the route type
presupposes that PIM or IGMP is the C-multicast control protocol,
or when the NLRI format associated with the route type is
independent of the C-multicast control protocol.

- Range 0x43-0x7f: mLDP Range. Values are assigned from this range
when the NLRI format associated with the route type presupposes
that mLDP is the C-multicast control protocol.

- Range 0x80-0xff: This range is reserved; values should not be
assigned from this range.

In general, whenever an assignment is requested from this registry,
two codepoints should be requested at the same time: one from the
Generic/PIM range (0x01-0x3f) and one from the mLDP range (0x43-0x7f).
The two codepoints should have the same low-order 6 bits. If one of
the two codepoints is not actually needed, it should be registered
anyway, and marked as "Reserved."

References: RFC 6514, RFC 7441