C
HAPTER
14
| Basic Administration Protocols
Ethernet Ring Protection Switching
– 494 –
◆ Local FS – Shows if a forced switch command was issued on this
interface.
◆ Local MS – Shows if a manual switch command was issued on this
interface.
◆ MEP – The CFM MEP used to monitor the status on this link.
◆ RPL – Shows if this node is connected to the RPL.
Configure Details
◆ Domain Name – Name of a configured ERPS ring. (Range: 1-12
characters)
Service Instances within each ring are based on a unique maintenance
association for the specific users, distinguished by the ring name,
maintenance level, maintenance association’s name, and assigned
VLAN. Up to 6 ERPS rings can be configured on the switch.
◆ Domain ID – ERPS ring identifier used in R-APS messages.
(Range: 1-255; Default: None)
R-APS information is carried in an R-APS PDUs. The last octet of the
MAC address is designated as the Ring ID (01-19-A7-00-00-[Ring ID]).
If use of the default MAC address is disabled for the R-APS Def MAC
parameter, then the Domain ID will be used in R-APS PDUs.
◆ Admin Status – Activates the current ERPS ring. (Default: Disabled)
Before enabling a ring, the global ERPS function should be enabled see
("ERPS Global Configuration" on page 491), the east and west ring
ports configured on each node, the RPL owner specified, and the control
VLAN configured.
Once enabled, the RPL owner node and non-owner node state machines
will start, and the ring will enter idle state if no signal failures are
detected.
◆ Version – Specifies compatibility with the following ERPS versions:
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1 - ERPS version 1 based on ITU-T G.8032/Y.1344.
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2 - ERPS version 2 based on ITU-T G.8032/Y.1344 Version 2. (This
is the default setting.)
In addition to the basic features provided by version 1, version 2 also
supports:
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Multi-ring/ladder network support
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Revertive/Non-revertive recovery
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Forced Switch (FS) and Manual Switch (MS) commands for
manually blocking a particular ring port
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Flush FDB (forwarding database) logic which reduces amount of
flush FDB operations in the ring
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Support of multiple ERP instances on a single ring
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