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15-4
Cisco Prime Network 4.0 User Guide
OL-29343-01
Chapter 15 Monitoring Ethernet Operations, Administration, and Maintenance Tool Properties
Viewing Connectivity Fault Management Properties
• Continuity check—Multicast heartbeat messages exchanged periodically among MEPs. They allow
MEPs to discover other MEPs within a domain and allow maintenance intermediate points (MIPs)
to discover MEPs. Continuity check messages (CCMs) are confined to a domain and S-VLAN.
• Loopback—Unicast frames that a MEP transmits, at the request of an administrator, to verify
connectivity to a particular maintenance point. A reply to a loopback message indicates whether a
destination is reachable but does not allow hop-by-hop discovery of the path. A loopback message
is similar in concept to an Internet Control Message Protocol (ICMP) Echo (ping) message.
• Traceroute—Multicast frames that a MEP transmits, at the request of an administrator, to track the
path (hop-by-hop) to a destination MEP. They allow the transmitting node to discover vital
connectivity data about the path, and allow the discovery of all MIPs along the path that belong to
the same maintenance domain. For each visible MIP, traceroute messages indicate ingress action,
relay action, and egress action. Traceroute messages are similar in concept to User Datagram
Protocol (UDP) traceroute messages.
From the Logical Inventory tree, you can troubleshoot MEPs using CFM ping, traceroute, MEP status,
and MEP cross-check status. These commands, and all CFM commands, are described in Configuring
CFM, page 15-18.
Prime Network associates alarms with the corresponding MEP or global CFM logical inventory objects.
Prime Network correlates MEP down, MEP up, MEP missing, ETH-AIS, and ETH-RDI events with root
cause alarms and corresponding tickets that exist along the path between the MEP on the reporting
network element and the network element hosting the remote MEP.
To view CFM properties:
Step 1 In Prime Network Vision, double-click the required device for CFM.
Step 2 In the inventory window, choose Logical Inventory > CFM.
Figure 15-1 shows an example of CFM in logical inventory.