Multipoint Label Distribution Protocol In-Band Signaling in a Virtual Routing and Forwarding (VRF) Table Context
draft-ietf-l3vpn-mldp-vrf-in-band-signaling-03
Technical Summary
An IP Multicast Distribution Tree (MDT) may traverse both label
switching (i.e. - Multi-Protocol Label Switching, or MPLS) and non-
label switching regions of a network. Typically the MDT begins and
ends in non-MPLS regions, but travels through an MPLS region. In
such cases, it can be useful to begin building the MDT as a pure IP
MDT, then convert it to an MPLS Multipoint Label Switched Path (MP-
LSP) when it enters an MPLS-enabled region, and then convert it back
to a pure IP MDT when it enters a non-MPLS-enabled region. Other
documents specify the procedures for building such a hybrid MDT,
using Protocol Independent Multicast (PIM) in the non-MPLS region of
the network, and using Multipoint Extensions to Label Distribution
Protocol (mLDP) in the MPLS region. This document extends those
procedures to handle the case where the link connecting the two
regions is a "Virtual Routing and Forwarding Table" (VRF) link, as
defined in the "BGP IP/MPLS VPN" specifications. However, this
document is primarily aimed at particular use cases where VRFs are
used to support multicast applications other than Multicast VPN.
Working Group Summary
The WG supports this Document and its progress.
Document Quality
Two implementations of this protocol specification are known.
The Document has been reviewed by experts and these experts are acknowledged
in the appropriate section of the Document.
Personnel
Martin Vigoureux (L3VPN co-chair) is the Document Shepherd
Stewart Bryant is the Responsible Area Director
RFC Editor Note
At the end of the Security section, new para:
Operators MUST configure packet filters to ensure that
the mechanism described in this memo does not cause
non-global-scoped IPv6 multicast packets to be tunneled
outside their intended scope.
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The last but on paragraph of Section 1
OLD
encoded into the mLDP FEC element.
NEW
encoded into the mLDP FEC element in what this document terms "mLDP
in-band signaling."
END
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- 1 page 5: too many 'o' in 'co-oordination'
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Please add the following terms to Terminology
UMH: Upstream Multicast Hop, the upstream router in that is in the path to reach the source of the multicast flow.
RPA: Rendezvous Point Address, the address that is used as the root of the distribution tree for a range of multicast groups.
RD: Route Distinguisher, an identifier that makes a route unique in the context of a VRF.