Emulated Lan Connections; Control Vccs - 3Com CoreBuilder 9000 User Manual

378 C 15: LAN E
HAPTER
Emulated LAN
Connections

Control VCCs

Table 52 Control VCCs
VCC Name
Configuration
Control-direct
Control-distribute
MULATION
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.
Figure 21 Basic LAN Emulation Client Connections
The control VCCs carry control traffic such as LE_ARP requests and
responses. On initialization, control VCCs are established between LEC
and LES (bidirectional control-direct VCC and control-distribute VCC) as
well as a bidirectional configuration VCC between LEC and LECS.
Characteristics of the control VCCs are summarized in Table 52.
From/To Information carried
LEC<==>LECS LEC requests and receives
configuration information
from LECS, including LES
address
LEC<==>LES LEC sends and receives
controls from LES, including
LE_ARP information
LES==>LEC LES distributes control traffic
to LECs, including LE_ARP
information
Initialized by Duration
LEC While needed
LEC Membership of
LEC in ELAN
LES Membership of
LEC in ELAN