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4-20 CHAPTER 4: NETWORK CONFIGURATION TASKS
At this stage, the “LANE Monitor” tracks LES/BUS failure and activates
redundancy if there is a failure of primary LES.
Bridge 0’s LES/BUS is on CoreBuilder 7000 A and its backup is on
CoreBuilder 7000 B.
Bridge 1's LES/BUS is on CoreBuilder 7000 B and its backup on
CoreBuilder 7000 A. Both switches have LECS databases and each LECS
database has the admin ELAN pointing to switch A LES/BUS ELAN_ID.
Following this procedure, check all the above steps once again. Try to
achieve an intuitive understanding of the network.
If you power-off Switch B, (you have taken down bridge 1's LES/BUS), the
NMS realizes that the primary LES for bridge 1 runs on the switch that
failed and reports it. It then moves the pointer in the LECS database
running on switch A to the backup LES/BUS for bridge 1. All the
segments from bridge 1 move the backup ELAN. This takes a few minutes
for adjustment.
You will first notice that the LECs for bridge 1 on both the edge devices
are in a fatal state. They are then are recovered using the backup LES/BUS
on the switch A.
This example effectively demonstrates both LES/BUS and LECS recovery.
LECS Recovery
While selecting the LECS, the primary LECS was set to switch B. When
switch B failed, the LECs were pointed to switch A’s LECS (the second one
in the list) by the CoreBuilder 7000 automatically.
How to Move the “admin” ELAN LES/BUS Pair from One
CoreBuilder 7000 to Another.
If you want to move the “admin” ELAN LES/BUS pair from one
CoreBuilder 7000 to another, perform the following steps:
1 In the Backbone and Services Configuration window, change the
“admin” alias mapping to a new LES/ELAN-ID and select Apply.
This changes the “admin” LES in all of the LECS databases in one step.
2 Reset the CoreBuilder 7000 with the old “admin” LES.
This step releases all the connections (LECs) from the old “admin”
LES/BUS pair.