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| ERPS Commands
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Configuration Guidelines for ERPS
1. Create an ERPS ring: Create a ring using the erps domain command.
The ring name is used as an index in the G.8032 database.
2. Configure the east and west interfaces: Each node on the ring connects
to it through two ring ports. Use the ring-port command to configure
one port connected to the next node in the ring to the east (or
clockwise direction); and then use the ring-port command again to
configure another port facing west in the ring.
3. Configure the RPL owner: Configure one node in the ring as the Ring
Protection Link (RPL) owner using the rpl owner command. When this
switch is configured as the RPL owner, the west ring port is set as being
connected to the RPL. Under normal operations (Idle state), the RPL is
blocked to ensure that a loop cannot form in the ring. If a signal failure
brings down any other link in the ring, the RPL will be unblocked
(Protection state) to ensure proper connectivity among all ring nodes
until the failure is recovered.
4. Configure ERPS timers: Use the guard-timer command to set the timer
is used to prevent ring nodes from receiving outdated R-APS messages,
the holdoff-timer command to filter out intermittent link faults, and the
wtr-timer command to verify that the ring has stabilized before
blocking the RPL after recovery from a signal failure.
Table 106: ERPS Commands
Command Function Mode
erps Enables ERPS globally on the switch GC
erps domain Creates an ERPS ring and enters ERPS configuration mode GC
control-vlan Adds a Control VLAN to an ERPS ring ERPS
enable Activates the current ERPS ring ERPS
guard-timer Sets the timer to prevent ring nodes from receiving outdated
R-APS messages
ERPS
holdoff-timer Sets the timer to filter out intermittent link faults ERPS
major-domain Specifies the ERPS ring used for sending control packets ERPS
meg-level Sets the Maintenance Entity Group level for a ring ERPS
node-id Sets the MAC address for a ring node ERPS
propagate-tc Enables propagation of topology change messages from a
secondary ring to the primary ring
ERPS
ring-port Configures a node’s connection to the ring through the east or
west interface
ERPS
rpl owner Configures a ring node to be the RPL owner or a non-owner ERPS
wtr-timer Sets timer to verify that the ring has stabilized before blocking
the RPL after recovery from a signal failure
ERPS
show erps Displays status information for all configured rings, or for a
specified ring
PE
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