Cabletron Systems Smart 04-0053-01 - Manual (Page 32)

2-14 SmartSwitch ATM User Guide
Creating an Emulated LAN IP Over ATM and LANE
In the following example, a client is identified by its ATM address and IP address, and associates it with ELAN number
1.
SmartSwitch # add lecselanlec
AtmAddress() : 39:00:00:00:00:00:00:00:00:00:44:55:66:11:22:33:44:55:66:00
MACAddress/RouteDesc() : — No MAC address is specified
Layer3Address[IP]() : 204.123.91.7
ELANNumber(0) : 1 — ELAN is specified by ELAN number
TLVSet() : — No TLV set is specified
SmartSwitch #
If the currently defined ELAN policies use either Best Effort or By ATM Address and/or By IP Address, the client with
the ATM address and IP address specified above will be assigned to ELAN 1.
Note To specify a TLV set with the add lecselanlec command, the TLV set must
currently exist. Use the add lecstlvset command to create a TLV set. For
detailed information on the add lecstlvset command, see the SmartSwitch ATM
Reference Manual.
2.2.6 LANE Over WAN Circuits
SmartSwitch ATM switches allows LANE server support across WAN ATM connections. In this type of configuration,
a SmartSwitch running LANE services (LECS, LES and BUS) resides on one side of an ATM WAN, while
SmartSwitch ATM switches on the other side of the WAN provide connectivity for LANE clients across the WAN to
the LANE server. In effect, the connections created between the LANE server and its clients “tunnel” across the ATM
WAN’s PVP connections.
Note See Chapter 5, "Virtual Ports and Static Connections." for information about PVP
connections and virtual ports.
Physical Versus Logical BUS Multicasting
When connecting to LANE services across an ATM WAN, it’s important to consider the WAN-to-LAN connectivity.
Typically, PVPs (assigned by services provides) are terminated on the end switches using virtual ports. In a simple
configuration, with a single PVP terminated by a single virtual port at each end, clients submitting ELAN join requests
can traverse the WAN and reach LANE services. Likewise, the LANE servers (especially the BUS) can reply back
across this single connection. In effect, all traffic between the end switches is “tunneled” across the PVP WAN
connection. In this case, the BUS creates its point-to-multipoint client connections using physical multicasting across
the WAN (see Figure 2-1).