Cisco Catalyst 5000 Series Manual page 23

Configuring Redundant LANE Services
database. LANE LES/BUS and LECS redundancy is always enabled. You can use this redundancy feature
by configuring multiple servers.
LES/BUS and LECS redundancy works only with Cisco LECS and LES combinations. Third-party LANE
server components continue to interoperate with the LECS and LES/BUS function of Cisco routers and
switches, but cannot take advantage of the redundancy features.
The following servers are single points of failure in the ATM LANE system:
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LES/BUS and LECS redundancy eliminates these single points of failure.
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Enabling Redundant LECSs
To enable redundant LECSs, enter the multiple LECS addresses to the end ATM switches, which are used
as central locations for the list of LECS addresses. After entering the LECS addresses, LANE components
connected to the switches can obtain the global list of LECS addresses.
Note
To configure LES/BUS and LECS redundancy, you must enable multiple, redundant, and standby LECSs
and multiple, redundant, and standby LES/BUSs. The LES/BUS and LEC redundancy configuration
procedure guards against failure on hardware on which LANE components are running, including all
Catalyst 5000 series switches. The configuration procedure is not effective for ATM network switch
failures.
To enable LES/BUS and LEC redundancy, use the following commands beginning in global configuration
mode:
SUMMARY STEPS
1. Switch(config)# atm lecs-addressaddress
2. ATM(config)# name elan-name server-atm-address les-address[index n ]
DETAILED STEPS
Command or Action
Step 1 Switch(config)# atm lecs-addressaddress
Step 2 ATM(config)# name elan-name server-
atm-address les-address[index n ]
LECS (configuration server)
LES (ELAN server)
BUS
Enabling Redundant LECSs, page 23
Enabling ILMI Keepalive Timeout, page 24
Using UNI 3.1 Signalling Support, page 24
Configuring Fast SSRP for Redundant LANE Services, page 24
Configuring Fast SSRP for Redundant LANE Services, page 25
Purpose
Allows you to enter the multiple LECS addresses on the ATM switch.
Specifies redundant LES/BUSs on the ATM module. Enter the command
for each LES address on the ELAN. The index determines the priority; 0 is
the highest priority.
Enabling Redundant LECSs
23