Allied-telesis AT-S60 Manual do Utilizador descarregar pdf (Página 291)

100

101

Chapter 15: GARP VLAN Registration Protocol

Section II: Local and Telnet Management 290

An instance of GID consists of the set of state machines that define the

current registration and declaration state of all attribute values

associated with the GARP Participant. Separate state machines exist for

the Applicant and Registrar. This is shown in Figure 100.

Figure 100 GID Architecture

GARP registers and de-registers attribute values through GARP messages

sent at the GID level. A GARP Participant that wishes to make a

declaration (an Applicant registering an attribute value) sends a JoinIn or

JoinEmpty message. An Applicant that wishes to withdraw a declaration

(de-registering an attribute value) sends a LeaveEmpty or LeaveIn

message. Following the de-registration of an attribute value, the

Applicant sends a number of Empty messages. The purpose of the

Empty message is to prompt other Applicants to send JoinIn/JoinEmpty

messages. For the GARP protocol to be resilient against multiple lost

messages, a LeaveAll message is available. Timers are used in the state

machines to generate events and control state transitions.

The job of the Applicant is twofold:

❑ To ensure that this Participant’s declarations are registered by

other Participants’ Registrars

❑ To ensure that other Participants have a chance to re-declare

(rejoin) after anyone withdraws a declaration (leaves).

Attribute ... state:

Attribute C state:

Attribute A state:

Applicant

State

Registrar

State

Attribute B state:

GID

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