Chapter 20
| 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to prevent ring nodes from receiving outdated R-APS messages, the holdoff-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.
5.
Configure the ERPS Control VLAN (CVLAN): Use the control-vlan command to
create the VLAN used to pass R-APS ring maintenance commands. The CVLAN
must NOT be configured with an IP address. In addition, only ring ports may be
added to the CVLAN (prior to configuring the VLAN as a CVLAN). No other ports
can be members of this VLAN (once set as a CVLAN). Also, the ring ports of the
CVLAN must be tagged. Failure to observe these restrictions can result in a loop
in the network.
clear erps
statistics
Clears statistics, including SF, NR, NR-RB, FS, MS, Event, and Health
protocol messages
PE
erps clear Manually clears protection state which has been invoked by a Forced
Switch or Manual Switch command, and the node is operating under
non-revertive mode; or before the WTR or WTB timer expires when
the node is operating in revertive mode
PE
erps
forced-switch
Blocks the specified ring port PE
erps
manual-switch
Blocks the specified ring port, in the absence of a failure or an erps
forced-switch command
PE
show erps Displays status information for all configured rings, or for a specified
ring
PE
Table 101: ERPS Commands (Continued)
Command Function Mode
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