Forwarding Media Access Control (MAC) Frames over Multiple Access Protocol over Synchronous Optical Network/Synchronous Digital Hierarchy (MAPOS)
RFC 3422
Document | Type |
RFC - Informational
(November 2002; No errata)
Was draft-okamoto-mac-over-mapos (individual in int area)
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Authors | Osamu Okamoto , Takahiro Sajima , Mitsuru Maruyama | ||
Last updated | 2015-10-14 | ||
Stream | IETF | ||
Formats | plain text html pdf htmlized bibtex | ||
Stream | WG state | (None) | |
Document shepherd | No shepherd assigned | ||
IESG | IESG state | RFC 3422 (Informational) | |
Consensus Boilerplate | Unknown | ||
Telechat date | |||
Responsible AD | Thomas Narten | ||
IESG note | Published as RFC 3422 | ||
Send notices to | (None) |
Network Working Group O. Okamoto Request for Comments: 3422 M. Maruyama Category: Informational NTT Laboratories T. Sajima Sun Microsystems November 2002 Forwarding Media Access Control (MAC) Frames over Multiple Access Protocol over Synchronous Optical Network/Synchronous Digital Hierarchy (MAPOS) Status of this Memo This memo provides information for the Internet community. It does not specify an Internet standard of any kind. Distribution of this memo is unlimited. Copyright Notice Copyright (C) The Internet Society (2002). All Rights Reserved. IESG Note This memo documents a way of tunneling Ethernet frames over MAPOS networks. This document is NOT the product of an IETF working group nor is it a standards track document. It has not necessarily benefited from the widespread and in-depth community review that standards track documents receive. Abstract This memo describes a method for forwarding media access control (MAC) frames over Multiple Access Protocol over Synchronous Optical Network/Synchronous Digital Hierarchy (MAPOS), thus providing a way to unify MAPOS network environment and MAC-based Local Area Network (LAN) environment. 1. Network Model In the Network model assumed in this memo, MAC-based LAN traffic is forwarded by a MAPOS switched network. This model allows distant LANs to be interconnected to form a single LAN segment. Transparent LAN Service (TLS) is provided by encapsulating MAC frames in MAPOS frames and by mapping MAC addresses to MAPOS addresses. Okamoto, et. al. Informational [Page 1] RFC 3422 Forwarding MAC Frames over MAPOS November 2002 This network model is shown in figure 1. "MAPOS network" is composed of MAPOS switches, SONET/SDH leased lines and optical fiber cables. A LAN is connected to a MAPOS network by a Network Adapter (NA) which has a MAPOS interface and an ethernet interface. A unique MAPOS address is assigned to each NA by NSP (Node-Switch Protocol) [2]. +-----------+ MAC-based LAN N1 +---+ | MAPOS | +---+ MAC-based LAN N2 ---------------| |----| network |----| |--------------- | +---+ | | +---+ | +-----+ Network | N0 | Network +-----+ | | adapter +-----------+ adapter | | +-----+ B1 B2 +-----+ Host H1 Host H2 Figure 1. VPN network service model with LANs N1 and N2 Host H1 in LAN N1 and host H2 in LAN N2 are connected to distinct MAC-based LANs. Transparent LAN service is provided by MAPOS network N0 exchanging MAC frames between Host H1 and Host H2. Using this mechanism, a single VLAN segment can be setup from multiple LANs that may be geographically located far away from each other. The use of a switched technology is recommended for building a MAC- based LAN. In some cases, however, this becomes a requirement. A likely example is the situation where a MAC-based LAN having two network adapters, both attached to the same MAPOS network (for redundancy). If the LAN is built using shared (non-switched) technology, then this loop configuration is bound to be stormed by incessant broadcast traffic. This can only be circumvented by using switched technology with support for broadcast spanning tree [7]. 2. Forwarding a MAC Frame This section describes the MAC frame forwarding mechanism in the MAPOS network. 2.1. Outline In figure 2, LANs N1 and N2 communicates via MAPOS network N0. NAs B1 and B2 are gateways into Network N0, and they each have a MAPOS interface and an ethernet interface. Okamoto, et. al. Informational [Page 2] RFC 3422 Forwarding MAC Frames over MAPOS November 2002 +------------+ |MAPOS header| +-----------+ +------------+ +-----------+ | MAC header| encapsulate | MAC header| decapsulate | MAC header| +-----------+ ----------> +------------+ ----------> +-----------+ |information| | information| |information| +-----------+ +------------+ +-----------+ MAC frame Bridged MAPOS frame MAC frame +------------+ LAN N1 +---+ | MAPOS | +---+ LAN N2Show full document text