Cabletron Systems 04-0053-01 manual By MAC Address, By Route Descriptor

Creating an Emulated LAN IP Over ATM and LANE

Note If the default ELAN (ELAN 0) has been deleted, the client is dropped.

By using ELAN join policies, clients attempting to join LANE services can be assigned to specific ELANs. Table 2-1lists the ELAN join policies that can be configured on an ATM SmartSwitch.

Table 2-1 ELAN Join Policies

Policy No.	ELAN Join Policy	Information Source Checked
1	Best Effort	Default ELAN policy. Checks configuration information stored by the add
		lecselanlec command and during ELAN creation (add elan command).
2	By ATM Address	Checks configuration information stored by the add lecselanlec command.
3	By MAC Address	Checks configuration information stored by the add lecselanlec command.
4	By Route Descriptor	Checks configuration information stored by the add lecselanlec command.
5	By LAN Type	Checks configuration information stored during ELAN creation (add elan
		command).
6	By Packet Size	Checks configuration information from the add lecspacketsize command.
7	By ELAN Name	Checks configuration information stored by the add lecselannametable
		command.

Note For detailed information on each of the commands that ELAN join policies interacts with, see the command descriptions in the SmartSwitch ATM Reference Manual.

You can give each ELAN join policy a priority value to determine its hierarchy among other ELAN join policies. If you define several ELAN join policies, the policy with the greatest priority value is tried first. If that policy fails, the policy with the next greatest priority value is attempted, and so on. ELAN join policies with the same priority value are ANDed together. For example, if three join policies are create, each with the same priority value, a client requesting LANE services must meet the criteria of all three policies to be assigned an ELAN. If the client fails to meet the requirements of all three policies, the policy with the next lowest priority value will attempt to assign the client to an ELAN.

2-12 SmartSwitch ATM User Guide