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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
DETAILED STEPS
Note By disabling Rx on an interface, any ESMC packet received on the interface shall be discarded. By
disabling Tx on an interface, ESMC packets will not be sent on the interface; any pending Switching
Message Delay timers (TSM) are also stopped.
Verifying ESMC Configuration
Use the following commands to verify ESMC configuration:
• show esmc
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
interface
Example:
Router(config)# interface
Enters interface configuration mode.
Step 4
esmc mode {tx | rx}
Example:
Router(config-if)# esmc mode tx
Enables the ESMC process at the interface level. The no
form of the command disables the ESMC process.
Step 5
network-clock source quality-level
value
{tx | rx}
Example:
Router(config-if)# network-clock
source quality-level <value> tx
Configures the QL value for ESMC on a gigabitethernet
port. The value is based on global interworking options:
• If Option 1 is configured, the available values are
QL-PRC, QL-SSU-A, QL-SSU-B, QL-SEC, and
QL-DNU.
• If Option 2 is configured with GEN 2, the available
values are QL-PRS, QL-STU, QL-ST2, QL-TNC,
QL-ST3, QL-SMC, QL-ST4, and QL-DUS.
• If Option 2 is configured with GEN1, the available
values are QL-PRS, QL-STU, QL-ST2, QL-SMC,
QL-ST4, and QL-DUS
Step 6
esmc mode ql-disabled
Example:
Router(config-if)# esmc mode
ql-disabled
Enables the QL-disabled mode.