with devices that do not support synchronization, synchronization features can be disabled or partially enabled
to maintain backward compatibility.
Support On Cisco ASR 1000 Series Aggregation Services Routers
Cisco ASR 1000 Series Software
Configuration Guide .
Note
The network clock can be configured in global configuration mode and interface configuration mode:
Configuring the Network Clock in Global Configuration Mode
Use the following commands to configure the network clock in global configuration mode on the Cisco SIP-40:
Purpose
Command
Enables G.781 based automatic clock selection
process. G.781 is the ITU-T Recommendation that
specifies the synchronization layer functions.
Router(config)# [no] network-clock
synchronization automatic
Example:
Router(config)#
network-clock synchronization
automatic
Configures the clocking system hardware with the
desired parameters. These are the options:
•
For option 1, the default value is EEC-Option
1 (2048).
•
For option 2, the default value is EEC-Option
2 (1544).
Router(config)# [no] network-clock eec {1 | 2}
Example:
Router(config)# network-clock eec 1
Configures the router to work in a synchronized
network mode, as described in G.781. The following
are the options:
•
Option 1: Refers to synchronization networks
designed for Europe (SDH/ E1 framings are
compatible with this option).
•
Option 2: Refers to synchronization networks
designed for the US (SONET/T1 framings are
compatible with this option).
The default option is 1. While choosing option 2, you
must specify whether it is second-generation message
(GEN2) or first-generation message (GEN1).
Network clock configurations that are not
common between options should be
configured again.
Note
Router(config)# [no] network-clock
synchronization ssm option {1| 2 {GEN1 | GEN2}}
Example:
Router(config)# network-clock synchronization
ssm option 2 GEN1
Cisco ASR 1000 Series Aggregation Services Routers SIP and SPA Software Configuration Guide, Cisco IOS XE
Everest 16.5
OL-14127-17
135
Configuring the Ethernet SPAs
Configuring the Network Clock for the 2-Port Gigabit Synchronous Ethernet SPA on a Cisco ASR 1000 Series Router