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Cisco ME 3800X and ME 3600X Switch Command Reference
OL-28238-01
Chapter 2 Cisco ME 3800X and ME 3600X Switch Cisco IOS Commands
ql-enabled rep-segment
ql-enabled rep-segment
To configure a Synchronous Ethernet (SyncE) Resilient Ethernet Protocol (REP) workaround for
network resiliency and to avoid timing loops when there are any network failures within the REP
segment, use the
ql-enabled rep-segment
command in global configuration mode. To disable the
workaround, use the
no
form of this command.
ql-enabled rep-segment
segment-id
no ql-enabled rep-segment
Syntax Description
Command Modes
Global configuration
Command History
Usage Guidelines
Some SyncE networks use Ethernet Synchronous Messaging Channel (ESMC) with source-specific
multicast (SSM) to ensure that the highest quality level clock available is selected and to prevent timing
loops in the network. Because ESMC SSM is not supported on the switch, we recommend configuring
the SyncE network as a REP segment to provide a REP workaround.
If you do not configure a REP workaround, an intermittent failure or change in network topology can
cause timing loops in the SyncE network. Configuring REP allows the segment to automatically respond
to a failure in the ring and avoid timing loops by changing the direction of the reference clock path.
SyncE uses REP only for failure detection, and not for timing topology discovery or timing loop
prevention. Timing loops can still occur if port priority is not correctly configured.
You can see if a REP segment is enabled by entering the
show network-clocks
privileged EXEC
command.
See the software configuration guide for more information about configuring REP segments and
configuring the REP workaround.
Examples
This example shows how to configure the REP segment 3 as the quality-level workrooms.
Switch(config)#
dl-enabled segment 3
Related Commands
segment-id
Specifies the SyncE REP segment to be used for the ESMC SSM workaround. The
segment ID range is 1 to 1024.
Release
Modification
12.2(52)EY
This command was introduced.
Command
Description
network-clock-select
Configures the network clock for the switch.
show network-clocks
Displays SyncE configuration on the switch.
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