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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|
|---|---|---|---|
| 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 N2
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