Symptom
T1/E1 configured for voice PRI comes up on L1 but L2 cycles between "Awaiting_Establishment" and "TEI_Assigned".
Conditions
Issue happens if T1/E1 is configured to NOT participate on Clock Synchronization.
-The following command is added to the configuration:
no network-clock synchronization participate 0/1
-Once the command is added we can see that the module no longer participates on the Clock Synchronization:
sh platform hardware subslot 0/1 module device networkclock
primary clock 1, secondary clock 255, ntwk_clk_selected No, ntwk_clk_participate No, current clock = 1
PLL status= 1, and cntl = 6
-After a reboot the command is still on the configuration but we can see the module participating again:
sh platform hardware subslot 0/1 module device networkclock
primary clock 1, secondary clock 255, ntwk_clk_selected No, ntwk_clk_participate Yes, current clock = 1
PLL status= 2, and cntl = 7
Workaround
Remove the command and re-add:
router(config)#network-clock synchronization participate x/y
router(config)#no network-clock synchronization participate x/y
