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Cisco ASR 901 Series Aggregation Services Router Software Configuration Guide
OL-23826-09
Chapter 22 Configuring Clocking
Configuring Network Clock for Cisco ASR 901 Router
Configuring Network Clock in Global Configuration Mode
Complete the following steps to configure the network clock in global configuration mode:
SUMMARY STEPS
1. enable
2. configure terminal
3. network-clock synchronization automatic
4. network-clock eec {1 | 2}
5. network-clock synchronization ssm option {1 | 2 {GEN1 | GEN2}}
6. network-clock hold-off {0 | 50-10000} global
7. network-clock external slot/card/port hold-off {0 | 50-10000}
8. network-clock wait-to-restore 0-86400 global
9. network-clock input-source priority {interface interface-name slot/port | top slot/port | {external
slot/card/port [t1 {sf | efs | d4} | e1 [crc4| fas| cas [crc4] | 2048k | 10m]}}
10. network-clock input-source priority controller [t1/e1] slot/port
11. network-clock revertive
12. network-clock output-source system priority {external slot/card/port [t1 {sf | efs | d4} | e1 [crc4|
fas| cas [crc4] | 2048k | 10m]}
DETAILED STEPS
Command or Action Purpose
Step 1
enable
Example:
Router> enable
Enables privileged EXEC mode.
• Enter your password if prompted.
Step 2
configure terminal
Example:
Router# configure terminal
Enters global configuration mode.
Step 3
network-clock synchronization
automatic
Example:
Router(config)# network-clock
synchronization automatic
Enables G.781-based automatic clock selection process.
G.781 is the ITU-T Recommendation that specifies the
synchronization layer functions.
Step 4
network-clock eec {1 | 2}
Example:
Router(config)# network-clock eec 1
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).