Avaya M-ACCF/SF Manual Do Utilizador
Chapter 1
Overview
Avaya M770 M-ACCF/SF ATM Access Modules User’s Guide
5
Emulated LAN Connections
LECs and LESs communicate with each other by means of ATM virtual channel
connections (VCCs). Control signals and data transmissions are handled by separate
VCCs: Control VCCs and Data VCCs.
connections (VCCs). Control signals and data transmissions are handled by separate
VCCs: Control VCCs and Data VCCs.
Figure 1.1
Basic LAN Emulation Client Connections
Control VCCs
The control VCCs carry control traffic such as LE_ARP requests and responses. On
initialization, control VCCs are established between LEC and LES (bi-directional
control-direct VCC and control-distribute VCC) as well as a bi-directional configuration
VCC between LEC and LECS. Characteristics of the control VCCs are summarized
in Table 1.1.
initialization, control VCCs are established between LEC and LES (bi-directional
control-direct VCC and control-distribute VCC) as well as a bi-directional configuration
VCC between LEC and LECS. Characteristics of the control VCCs are summarized
in Table 1.1.
Table 1.1
Control VCCs
VCC Name
From/To
Information carried
Initialized
by
by
Duration
Configuration LEC<==>LECS LEC requests and
receives
configuration
information from
LECS, including LES
address
configuration
information from
LECS, including LES
address
LEC
While
needed
needed
Control-direct LEC<==>LES
LEC sends and
receives controls
from LES, including
LE_ARP information
receives controls
from LES, including
LE_ARP information
LEC
Membership
of LEC in
ELAN
of LEC in
ELAN