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HiSpeed Switch Troubleshooting Guide
11-2
US7070447-001, Rev 01
Draft Level—Hitachi Confidential
Permanent Virtual Circuits vs.
Switched Virtual Circuits
ATM connections can be established manually (Permanent Virtual Circuits) or
dynamically (Switches Virtual Circuits). Permanent Virtual Circuits (PVCs) are
usually defined for long-term connections and automatically re-established after a
network failure. Switched Virtual Circuits (SVCs) uses Q.2931 signaling to
define and release connections as needed. Unlike PVCs, SVC connections are not
automatically re-established after a network failure.
The HiSpeed switch implements the following ATM services:
❒ LAN Emulation (LANE)
❒ Classical IP over ATM (CIP)
❒ Point-to-Point Bridging (PTOP)
❒ Trunking
LAN Emulation (LANE)
LANE emulates a traditional LAN (ie. Ethernet or Token Ring) over ATM by
mapping MAC addresses to ATM addresses, connectionless technologies to
connection-oriented technologies, and emulating the broadcast nature of LANs.
Figure 11-2. ATM LANE
OC-3
LEC
vci 32
vci 45
vci 67 vci 32
OC-3
vci 39
LES/BUS
LES/BUS
LEC
VLAN = ELAN VLAN = ELAN
* Ever
y
ELAN must have (1) uni
q
ue LES/BUS
p
air.
** Valid LEC values ran
g
e
f
rom 0 throu
g
h 31.
Workstation
LECS
Native ATM device