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Cisco ME 3800X and 3600X Switch Software Configuration Guide
OL-23400-01
Chapter 6 Configuring Synchronous Ethernet
Configuring SyncE
Enter the no network-clock-select mode option option 1 or the no network-clock-select mode option
option 2 to select the other option. mode with the default E1 or T1 values.
Use the no form of each command to remove the configuration or return to the default.
This example configures EEC as T1 with ESF framing, B8ZS line coding, and 1 to 133 foot.line buildout.
Switch (config)#
network-clock-select option option2
Switch (config)#
controller BITS input applique T1 framing esf linecode b8zs
Switch (config)#
controller BITS output applique T1 framing esf linecode b8zs
line-build0-out 0-133ft
Switch (config)#
end
Switch#
show controllers BITS
Applique type is T1
Line Coding is B8ZS(Rx), B8ZS(Tx)
Framing is ESF(Rx), ESF(Tx)
Line Build Out is 0-133ft
No alarms detected.
Selecting the Network Clock
You can force selection of a particular network clock or select automatic clock selection where the
switch uses the selection algorithm based on the priority and the validity of the input.
Beginning in privileged EXEC mode, use this step to set the SyncE network clock.
Step 7
show controller BITS
Verify the configuration.
Step 8
copy running-config startup config
(Optional) Save your entries in the switch startup
configuration file.
Command
Purpose
Command
Purpose
Step 9
set network-clocks {automatic | force-reselect |
next-select}
Select one of these options:
•
automatic—Use the clock selection algorithm to
select the clock.
•
force-reselect—Force the system to select the valid
input clock with the highest priority and to always
keep this clock as the reference clock.
•
next-select—Force selection of the next valid input
clock with the highest priority.
If the switch is in nonrevertive mode, the clock input does
not change unless the current clock becomes invalid.
Step 10
show network-clocks
Verify the configuration.
Step 11
copy running-config startup config
(Optional) Save your entries in the switch startup
configuration file.
