Just failed to magrating 7940 ip phones between 2 cluster yesterday
Some information of 2 clusters
Cluster A has just been upgraded from 6.1.2 to 8.6.2-21900 , and Cluster B upgraded from 8.5.1 to 8.6.2- 21900.
Cluster A used for the Shanghai Office , Cluster B used for others cities
We planned to magrate about 40 7940 iphones and 100 6921 iphones registered in Cluster A to Cluster B but finally failed.
following is what we had done .
1 changed "PREPARE CLUSTER FOR ROLLBACK TO PRE 8.0 “ from false to true in CUCM A
2 restarted TVS and TFTP service
3 reset those iphones
4 change the DHCP settings on the remote SWITCH
as the result , all 6921 IP phones successfully magrated between 2 clusters but 7940 failed
Is there any mistakes we made or some other points we should take attention??