ERPS commands clear erps ring instance clear erps statistics erp环 erp环 interface erp环 description erp环 guard-interval erp环 hold-off-interval erp环 instance erp环 instance control-vlan erp环 instance description erp环 instance enable erp环 instance protected-vlans erp环 instance protection-switch {{manual|force} |} erp环 instance revertive erp环 instance role erp环 instance rpl erp环 meg-level erp环 parent-ring erp环 sub-ring erp环 tcn-propogation erp环< ringid > transmission-interval erp环 wtr-interval show erps statistics show erps status show erps summary