Cabletron Systems 04-0053-01 Manual De Usuario

SmartSwitch ATM User Guide   2-11

IP Over ATM and LANE

Creating an Emulated LAN  

Use the 

 command on SW1 to see that the client has reached all the distributed LANE 

services and has successfully joined ELAN 

.

SW1 # show client

ClientNumber(ALL)                         :

Client Type    IP Address      Server Type  Server Conn  Status

==============================================================================

    1  LANE    90.1.1.22       LECS         Established  Operational

SW1 #

Notice in the example above that creating an ELAN with distributed services is a process of building from the bottom 
up: First, the BUS is created so that its address can be specified to the LES. Next, the LES is created so that its address 
can be specified to the LECS. Finally, the LECS is created. 

If needed, all three ELAN services can exist on separate switches. For example, the BUS can exist on one switch (use 
the 

 command), the LES can exist on another switch (use the 

 command), and the LECS can 

exist on another switch (use the 

 command).

If LNNI is enabled, each associated LES and BUS must reside on the same switch. 
See Section 2.2.7, “Using LNNI” for details.

2.2.5

ELAN Join Policies

ATM SmartSwitches provide control over the assigning of clients to ELANs. Control is accomplished by ELAN join 
policies. By default, ATM SmartSwitches have a single ELAN join policy defined — 

. When a client 

attempts to join LANE services, the ATM SmartSwitch uses information provided by the client to performs the 

 ELAN join test.

Additional security can be achieved through the use of ATM address filtering. See 
Section 8.1 for information regarding ATM address filtering.

Best Effort Elan Join Test

The following describe the 

 test.

Does the client specify the name of the ELAN it wants to join?

If yes, check whether an ELAN exists by that name. If an ELAN exists by that name, assign the 
client to the ELAN. If no ELAN exists by that name, assign the client to the default ELAN 
(ELAN 0).

If no, check the client against the configuration information stored by the 

 

command (see The LECSELANLEC Table, on page -13). If an entry exists that corresponds to 
the client, assign the client to the ELAN indicated. If the client does not correspond to an entry, 
assign it to the default ELAN (ELAN 0).