MPLS D. Frost
Internet-Draft S. Bryant
Intended status: Standards Track Cisco Systems
Expires: January 25, 2014 M. Bocci
July 24, 2013
MPLS-TP Next-Hop Ethernet Addressing
The Multiprotocol Label Switching (MPLS) Transport Profile (MPLS-TP)
is the set of MPLS protocol functions applicable to the construction
and operation of packet-switched transport networks. This document
presents considerations for link-layer addressing of Ethernet frames
carrying MPLS-TP packets.
Status of This Memo
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Frost, et al. Expires January 25, 2014 [Page 1]Internet-Draft MPLS-TP Ethernet Addressing July 2013
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described in the Simplified BSD License.
The MPLS Transport Profile (MPLS-TP) [RFC5921] is the set of protocol
functions that meet the requirements [RFC5654] for the application of
MPLS to the construction and operation of packet-switched transport
networks. The MPLS-TP data plane consists of those MPLS-TP functions
concerned with the encapsulation and forwarding of MPLS-TP packets
and is described in [RFC5960].
This document presents considerations for link-layer addressing of
Ethernet frames carrying MPLS-TP packets. Since MPLS-TP packets are
MPLS packets, existing procedures ([RFC3032], [RFC5332]) for the
encapsulation of MPLS packets over Ethernet apply. Because IP
functionality is only optional in an MPLS-TP network, IP-based
protocols for Media Access Control (MAC) address learning, such as
the Address Resolution Protocol (ARP) [RFC0826] and IP version 6
Neighbor Discovery [RFC4861], may not be available. This document
specifies the options for the determination and selection of the
next-hop Ethernet MAC address when MPLS-TP is used between nodes that
do not have an IP dataplane.
ARP Address Resolution Protocol
G-ACh Generic Associated Channel
LSP Label Switched Path
LSR Label Switching Router
MAC Media Access Control
MPLS-TP MPLS Transport Profile
Additional definitions and terminology can be found in [RFC5960] and
1.2. Requirements Language
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in [RFC2119].
2. Point-to-Point Link AddressingFrost, et al. Expires January 25, 2014 [Page 2]Internet-Draft MPLS-TP Ethernet Addressing July 2013
When two MPLS-TP nodes are connected by a point-to-point Ethernet
link, the question arises as to what destination Ethernet Media
Access Control (MAC) address should be specified in Ethernet frames
transmitted to the peer node over the link. The problem of