Control Block; Multiplexer; Parser; Figure 32: Oam Sublayer Entities - Juniper JUNOSE SOFTWARE FOR E SERIES 11.3.X - LINK LAYER CONFIGURATION GUIDE 2010-10-13 Configuration Manual

Control Block

Multiplexer

Parser

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Copyright © 2010, Juniper Networks, Inc.
the entities of the OAM sublayer and the traversal of OAM PDUs among the different
entities.

Figure 32: OAM Sublayer Entities

OAM_CTL.req OAMPDU.req
OAM_CTL.ind OAMPDU.ind
Control
OAM Sublayer
The control block functions as the interface between the OAM client and other blocks
internal to the OAM sublayer. The control block implements the discovery process, which
detects the existence and capabilities of remote OAM peers. It also includes the transmit
process that administers the transmission of OAM PDUs to the multiplexer and a set of
rules that manage the receipt of OAM PDUs from the packet parser.
The multiplexer manages frames generated or forwarded from the MAC client, control
block, and packet parser. The multiplexer passes through frames generated by the MAC
client untouched. It sends OAM PDUs generated by the control block to the subordinate
sublayer; for example, the MAC sublayer. The multiplexer also forwards loopback frames
from the packet parser to the same subordinate sublayer when the interface is in OAM
remote loopback mode.
The parser categorizes frames as OAM PDUs, MAC client frames, or loopback frames
and then transfers each class to the appropriate entity. OAM PDUs are delivered to the
control block. MAC client frames are transmitted to the superior sublayer. Loopback
frames are distributed to the multiplexer.
OAM Client on page 228
OAM Elements Overview on page 227
Chapter 7: Configuring IEEE 802.3ah OAM Link-Fault Management
MCF:MA_DATA.req MCF:MA_DATA.ind
Mux Parser
MAC:MA_DATA.req MAC:MA_DATA.ind
802.3 MAC data service interface
802.3 MAC data service interface
229