Ethernet ring commands

config
    - eth-ring ring-id
    - no eth-ring
        - [no] ccm-hold-time {down down-timeout | up up-timeout}
        - [no] compatible-version version
        - description description-string
        - no description
        - [no] guard-time time
        - [no] revert-time time
        - [no] rpl-node {owner | nbr}
        - [no] node-id mac
        - [no] sub-ring {virtual-link | non-virtual-link}
            - [no] interconnect {ring-id ring-id | vpls}
                - [no] propagate-topology-change
        - [no] path {a | b} [{port-id} raps-tag qtag[.qtag]]
            - description description-string
            - [no] rpl-end
            - eth-cfm
                - [no] mep mep-id domain md-index association ma-index
                    - [no] ccm-enable
                    - [no] ccm-ltm-priority priority
                    - [no] control-mep
                    - [no] control-sap-tag tag-range
                    - [no] description description-string
                    - [no] eth-test-enable
                        - [no] test-pattern {all-zeros | all-ones} [crc-enable]
                        - bit-error-threshold bit-errors
                    - low-priority-defect {allDef | macRemErrXcon | remErrXcon | errXcon | xcon | noXcon}
                    - mac-address mac-address
                    - one-way-delay-threshold seconds
                    - [no] shutdown
            - [no] shutdown