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Chapter 6: Ethernet Services and Interfaces Configuring Automatic State Propagation and Link Loss
Forwarding
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Page 6-27
Configuring Automatic State Propagation and Link
Loss Forwarding
Automatic state propagation enables propagation of radio failures back to the Ethernet port. You can also
configure Automatic State Propagation to close the Ethernet port based on a radio failure at the remote carrier.
Automatic state propagation is configured as pairs of interfaces. Each interface pair includes one Monitored
Interface and one Controlled Interface. You can create multiple pairs using the same Monitored Interface and
multiple Controlled Interfaces.
The Monitored Interface is a radio interface, a radio protection group, or a Multi-Carrier ABC group. The Controlled
Interface is an Ethernet interface or LAG. An Ethernet interface can only be assigned to one Monitored interface.
Each Controlled Interface is assigned an LLF ID. If ASP trigger by remote fault is enabled on the remote side of the
link, the ASP state of the Controlled Interface is propagated to the Controlled Interface with the same LLF ID at the
remote side of the link. This means if ASP is triggered locally, it is propagated to the remote side of the link, but
only to Controlled Interfaces with LLF IDs that match the LLF IDs of the affected Controlled Interfaces on the local
side of the link.
Note
It is recommended to configure both ends of the link to the same Automatic State Propagation
configuration.
LLF requires an activation key (PTP 820-SL-LLF). Without this activation key, only LLF ID 1 is available.
See
Configuring the Activation Key (CLI).
The following events in the Monitored Interface trigger ASP:
•
Radio LOF
•
Radio Excessive BER
•
Remote Radio LOF
•
Remote Excessive BER
•
Remove LOC
The user can also configure the ASP pair so that Radio LOF, Radio Excessive BER, or loss of the Ethernet connection
at the remote side of the link will also trigger ASP.
In addition, ASP is triggered if the Controlled Interface is a LAG, and the physical interfaces that belong to the LAG
are set to
Admin = Down in the Interface Manager.
When a triggering event takes place:
•
If the Controlled Interface is an electrical GbE port, the port is closed.
•
If the Controlled Interface is an optical GbE port, the port is muted.
Each Controlled Interface remains closed or muted until all triggering events are cleared.