Chapter 13
LANE Services
154
Cajun M770 ATM Switch User’s Guide
Changing the priority of a resilient LECS
You can force the election of a resilient LECS, by placing it on a higher priority level
than other resilient LECSes on the network. The higher the priority assigned to a
resilient LECS, the better the chances of it winning the election. By default all
resilient LECSes when created are assigned a priority of 128.
You can stop a resilient LECS being elected by assigning it a priority of zero. This
enables you to configure the LANE services on a switch that is hosting a resilient
LECS, without the possibility of the LECS becoming active.
Changing the priority of a LECS will trigger a new election process and the LECS
with the highest priority will be elected. If two or more LECSes have the same
priority level then the LECS with the higher ATM address will be elected.
Note:
If the network is recovering from a failure, the election process is different.
The resilient LECS with the highest up-time will remain the active LECS.
This is to minimize network disruption.
Note:
If you configure the priority of a resilient LECS to the highest priority (255),
this will force the LECS to be elected after a network failure regardless of the LECS
up-time.
For information on the commands used to change the priority of a resilient LECS,
see Setting priority level for a resilient LECS in Chapter 14 Managing the LECS.
The LES and BUS in a Cajun M770 ATM Switch
Each module can provide up to 16 combined LES/BUS pairs. By default, all
modules have one Ethernet LES/BUS named “default,” that will try to register with
the LECS. The M770 ATM Switch LESes support a proprietary automatic LES
address determination method. Therefore, all the M770 ATM Switch LESes can
automatically register with an M770 ATM Switch LECS. The benefit of this is that a
LES can be re-located without reconfiguring the LECS or the LECs on the ELAN
hosted by the re-located LES.
The M770 ATM Switch LESes support two proprietary mechanisms for Resilient
and Distributed LES/BUS services as described below. These features require that
the LECS, LES and BUS will be hosted on M770 ATM Switch modules.
Summary of Contents for CAJUN M770
Page 2: ...2 Cajun M770 ATM Switch User s Guide...
Page 14: ...xii Cajun M770 ATM Switch User s Guide...
Page 54: ...Chapter 4 Managing Miscellaneous Commands 36 Cajun M770 ATM Switch User s Guide...
Page 64: ...Chapter 5 Managing Physical Ports 46 Cajun M770 ATM Switch User s Guide...
Page 106: ...Chapter 6 Managing Virtual Ports 88 Cajun M770 ATM Switch User s Guide...
Page 112: ...Chapter 7 Managing Module Hardware 94 Cajun M770 ATM Switch User s Guide...
Page 122: ...Chapter 8 Managing PVC Connections 104 Cajun M770 ATM Switch User s Guide...
Page 158: ...Chapter 11 Managing the Management LEC 140 Cajun M770 ATM Switch User s Guide...
Page 176: ...Chapter 13 LANE Services 158 Cajun M770 ATM Switch User s Guide...
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