draft-ietf-mpls-multicast-encaps-01.txt   draft-ietf-mpls-multicast-encaps-02.txt 
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Expiration Date: March 2007 Cisco Systems, Inc. Expiration Date: March 2007 Cisco Systems, Inc.
Updates RFCs 3032 and 4023 Updates RFCs 3032 and 4023
Rahul Aggarwal Rahul Aggarwal
Yakov Rekhter Yakov Rekhter
Juniper Networks, Inc. Juniper Networks, Inc.
September 2006 September 2006
MPLS Multicast Encapsulations MPLS Multicast Encapsulations
draft-ietf-mpls-multicast-encaps-01.txt draft-ietf-mpls-multicast-encaps-02.txt
Status of this Memo Status of this Memo
By submitting this Internet-Draft, each author represents that any By submitting this Internet-Draft, each author represents that any
applicable patent or other IPR claims of which he or she is aware applicable patent or other IPR claims of which he or she is aware
have been or will be disclosed, and any of which he or she becomes have been or will be disclosed, and any of which he or she becomes
aware will be disclosed, in accordance with Section 6 of BCP 79. aware will be disclosed, in accordance with Section 6 of BCP 79.
Internet-Drafts are working documents of the Internet Engineering Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF), its areas, and its working groups. Note that other Task Force (IETF), its areas, and its working groups. Note that other
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RFC 4023 is modified as described below. RFC 4023 is modified as described below.
If the IP destination address of the GRE encapsulation is a unicast If the IP destination address of the GRE encapsulation is a unicast
IP address, then the ethertype value 0x8847 MUST be used in all cases IP address, then the ethertype value 0x8847 MUST be used in all cases
for the MPLS-in-GRE encapsulation. for the MPLS-in-GRE encapsulation.
If the IP destination address of the GRE encapsulation is a multicast If the IP destination address of the GRE encapsulation is a multicast
IP address, then: IP address, then:
- if both upstream-assigned and downstream-assigned labels may - the ethertype value 0x8847 MUST be used when the top label of the
appear as the top label of the encapsulated MPLS packets, then encapsulated MPLS packet is downstream-assigned,
the ethertype value 0x8847 MUST be used when the aforesaid label
is downstream-assigned, and the ethertype value 0x8848 MUST be
used when the aforesaid label is upstream-assigned.
- if all the encapsulated MPLS packets have an upstream-assigned - the ethertype value 0x8848 MUST be used when the top label of the
top label, or if all the encapsulated MPLS packets have a encapsulated MPLS packet is upstream-assigned.
downstream-assigned top label, then the ethertype value 0x8847
MUST be used.
Which of these two situations applies is determined by means outside Through procedures which are outside the scope of this specification,
the scope of this specification. it may be known that if the destination address of a GRE packet is a
multicast IP address, then the top label of the GRE payload is
upstream-assigned. In such a case, the occurrence of the 8847
codepoint in a GRE packet with a multicast destination IP address
MUST be considered an error, and the packet MUST be discarded.
6. IP Protocol Number 6. IP Protocol Number
RFC 4023 is modified as follows: the IPv4 Protocol Number field or RFC 4023 is modified as follows: the IPv4 Protocol Number field or
the IPv6 Next Header field is always set to 137, whether or not the the IPv6 Next Header field is always set to 137, whether or not the
encapsulated MPLS packet is an MPLS multicast packet. encapsulated MPLS packet is an MPLS multicast packet.
If the IP destination address of the IP encapsulation is an IP If the IP destination address of the IP encapsulation is an IP
multicast address, the IP tunnel may be considered to be a point-to- multicast address, the IP tunnel may be considered to be a point-to-
multipoint tunnel or a multipoint-to-multipoint tunnel. In either multipoint tunnel or a multipoint-to-multipoint tunnel. In either
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