The show frequency synchronization interfaces and clear frequency synchronization esmc statistics
commands on the host are extended to include satellite access ports.
Restrictions of SyncE in Satellite nV System
The following are some of the restrictions of Synchronous Ethernet within an nV satellite system:
•
Only limited SyncE support is provided to customers in release 5.2.0.
•
ASR9000v is the only supported satellite.
•
Hub-and-spoke (Dual-home) is the only supported topology.
•
Physical and Bundle ICLs are supported.
•
Host cannot synchronize to the satellite.
•
Minimal configuration support.
•
Minimum show command support.
•
Only supported for directly connected satellites in hub-and-spoke topologies.
•
Commands to configure the host's fabric interfaces as SyncE inputs are not permitted, as synchronizing
the host to one of its sites is not supported.
•
Application of Frequency Synchronization configuration commands on the satellite access ports is not
permitted.
Hub-and-Spoke Topology for Frequency Synchronization
A hub-and-spoke topology is the simplest topology where a centralized hub is connected to the peripherals
called "spokes". The hub-and-spoke is the simplest topology used in Frequency Synchronization in an nV
satellite system. In this topology, the satellites are directly connected to the host by using several links or a
single link bundle. The methods are as follows:
• Satellite connected with several devices—The satellites are connected to the host through several links.
• Satellites connected with a link bundle— The satellites are connected to the host through a single link
bundle.
The connection between host and satellite can be established and routed over an L2 access network.Note
The Inter-Chassis Links (ICLs) appear as point-to-point links for the host and the satellite. When you set up
a dual-host satellite, ensure that you apply identical configuration on each host to avoid synchronizing the
configuration between the two hosts.
Configuring SyncE on ASR 9000 Hosts
To implement satellite synchronization using SyncE:
Cisco ASR 9000 Series Aggregation Services Router nV System Configuration Guide, Release 5.3.x
48
Configuring the Satellite Network Virtualization (nV) System
Restrictions of SyncE in Satellite nV System
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