Fault verification and isolation – Loopback:
Verify connectivity to a specific point in the message. Equivalent to ping test.
Continuity Check Messages (CCM)
CCM Messages are multicast messages sent from MEP to MEP at configurable intervals. Loss of continuity is detected after no CCM is
received for 3.5 times the CCM interval.
Note
: There can be 4,094 VLANs per port and up to eight maintenance levels. This yields a worst case CCM transmission rate of 9.8
million CCMs per second if 3.3ms interval is used.
Continuity Check Message (CCM)
RDI Flags added in CCM Messages indicates loss of continuity in the remote direction.
CCM Message Format
CCM Configuration Parameters
CCM:
Enable/Disable sending Continuity Check messages.
Type:
Unicast/Multicast. If CCM is set to Enable, this field is ignored. In unicast mode you must enter the MAC address of the
destination unit.
Priority:
802.1p priority in the CCM VLAN Tag.
Tx Interval:
Choose from the supported CCM intervals: 1 s, 10 s, 1 min, 10 min.
The
CCM Result
button is a shortcut that brings the user directly to the CCM Results tab.
MPLS-TP, CCM Settings - Service Level OAM (Page 2)
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