Chapter 13 LANE Services
Avaya M770 ATM Switch User’s Guide 187
Round-robin.
This is the default method set when creating a new ELAN. No user configuration is
required.
The LEC is assigned to the next distributed LES address in sequence (each
distributed LES is used in turn). LECs assignment to the most suitable LES is left to
chance.
Group address
User configuration is required.
Every distributed LES on the ELAN is assigned a group address. Note, the same
group address is used by all the distributed LESes. It is this address that is returned
to every LEC by the LECS, when requesting to join the ELAN. The LEC will then
connect with the “nearest” distributed LES if PNNI routing is enabled (the switch
that offers the least number of hops will be selected).
Longest Match with LEC address.
No user configuration is required.
The LES address supplied by the LECS is the one which best matches the ATM
address of the LEC. This in practice should also provide the nearest distributed LES
to the requesting LEC.
Note this may not necessarily be true, should you be using manual configured
addresses or non-standard ATM addresses for M770 ATM switches that are hosting
the LEC.
The Management LEC in an Avaya M770 ATM Switch• The M770 ATM Switch has one management LEC for managing the M770 ATM
Switch. It is located on the Master agent module in the switch and supports
several high-level protocols such as:
— Telnet for a command-line interface.
— UDP for SNMP management and TFTP software upgrades.
— BOOTP for obtaining M770 ATM Switch’s IP address from a server.
— ICMP for PING inward and outward for IP network configuration
diagnosis.
• By default, the M770 ATM Switch management LEC uses the Burnt-In Address
(BIA) as its MAC address. This address can be overridden and a Locally
Administered Address (LAA) can be assigned. The management LEC will
register this address with the LES that is hosting the ELAN that the LEC wishes
to join.
• The M770 ATM Switch management LEC, by default, requests to join an
Ethernet ELAN.