Avaya Configuring Line Services Manual de usuario descargar pdf (Pagina 35)

Overview of Line Protocols

1-11

SMT contains three components:

• Connection Management (CMT)

• Ring Management (RMT)

• SMT frame services

CMT

CMT performs these functions:

• Inserts and removes stations at the PHY level

• Connects PHYs and MACs with a node

• Uses trace diagnostics to identify and isolate a faulty component

• Manages the physical connection between adjacent nodes, including

— Testing the quality of the link before establishing a connection

— Establishing a connection

— Monitoring link errors continuously when the ring is operational

RMT

RMT receives status information from the MAC and CMT, reporting this

information to SMT and higher-level processes (for example, SNMP). It detects

stuck-beacon conditions and duplicate addresses, and determines when the MAC

is available for transmitting frames. Duplicate addresses prevent the proper

operation of the ring.

SMT Frame Services

SMT frame services manage and control the FDDI network and the nodes on the

network. Different SMT frame classes and types implement these services. Frame

class identiﬁes the function that the frame performs. Frame type speciﬁes whether

the frame is an announcement, a request, or a response to a request. FDDI SMT

frames are limited to a single FDDI ring. The frames cannot move across wide

area networks or across multiple FDDI rings. The frames do not manage functions

outside FDDI.

able 1-1 lists the SMT frames that Bay Networks routers support.

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Avaya Configuring Line Services Manual de usuario Pagina 35