OmniSwitch OS6860/OS6900/OS10K Troubleshooting Guide Part No.032996-00 Rev.A
AOS Release 7.X and 8.X January 2015
Alcatel-Lucent Page 132 of 148
Guard Timer (centi-sec) : 50,
Virtual Channel : enable,
MEG Level : 1,
Ring State : idle,
Active ERP version : Ver 2,
Ring Node Type : rpl,
RPL Port : 1/1/1,
Last State Change : 00h:36m:35.00s
ERP Versions and Parameters
There are two types of ERP versions supported, as below:
ERPv1 supports a single-ring topology with features of loop prevention and supports standard FDB (Filtering
database) MAC learning, forwarding, flush behavior, and port blocking, and unblocking mechanisms.
ERPv2 supports multi-ring and ladder topologies that contain interconnection nodes, interconnected shared
links, master rings and sub-rings. Multiple ERP instances are supported per physical ring, in addition to
features on ERPv1.
Here is the list of the common terminologies/parameters used:
Automatic Protection Switching (APS) or Ring APS (R-APS), is a protocol used to coordinate protection and
recovery switching mechanisms over the Ethernet ring.
Ring APS (Automatic Protection Switching) Messages are protocol messages defined in Y.1731 and G.8032
that determine the status of the ring.
Ring Protection Link (RPL) is a link blocked to avoid forming a loop in the ring.
Ring Blocked (RB) is a blocked RPL, blocked under normal conditions.
Signal Failure (SF) is a message sent on the ring to inform other ring nodes of the failure condition, when a
link or port failure is detected.
Remote Maintenance End Point identifier (RMEPID) is identifier used to identify the endpoint.
Link Monitoring is the monitoring of links using standard ETH (Ethernet Layer Network) CC OAM
messages. Note that for improved convergence times, this implementation also uses Ethernet link up and link
down events.
Signal Fail (SF) is the status declared when a failed link or node is detected.
No Request (NR) is the status declared when there are no outstanding conditions (for example, SF) on the
node.
ERP Service VLAN is the Ring-wide VLAN used exclusively for transmission of messages, including R-APS
messages for Ethernet Ring Protection.
ERP Protected VLAN is the VLAN that is added to the ERP ring. ERP determines the forwarding state of
protected VLANs.
Filtering Database (FDB) is a database that stores filtered data according to the R-APS messages recieved.
This database also maintains an association table that identifies the master rings for a given sub-ring.
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