Continuity Check (Cc) - Nokia 7302 Basics, Management And Oam Manual

Ethernet Connection Fault Management
A traced MAC address is carried in the payload of the linktrace message. Each MIP
and MEP receiving the linktrace message checks whether it has learned the target
MAC address. In order to use linktrace the target MAC address must have been
learned by the nodes in the network. If so, a linktrace message is sent back to the
originating MEP. Also, a MIP forwards the linktrace message out of the port where
the target MAC address was learned.
The linktrace message itself has a multicast destination address. On a broadcast
LAN, it can be received by multiple nodes connected to that LAN. But, at most, one
node will send a reply.
Figure 6
The following linktrace-related functions are supported:
•
•
•
•

8.5 Continuity Check (CC)

A Continuity Check Message (CCM) is a multicast frame that is generated by a MEP
and multicast to all other MEPs in the same MA. The CCM does not require a reply
message. To identify faults, the receiving MEP maintains an internal list of remote
MEPs it should be receiving CCM messages from.
This list is based off of the remote-mepid configuration on the association that the
MEP is created on. When the local MEP does not receive a CCM from one of the
configured remote MEPs within a pre-configured period, the local MEP raises an
alarm.
174
CFM Linktrace
Enable or disables linktrace functions on an MEP.
MEP - Supports generating linktrace messages and responding with linktrace
reply messages.
MIP - Supports responding to linktrace messages with linktrace reply messages
when encoded TTL is greater than 1, and forward the linktrace messages
accordingly if a lookup of the target MAC address in the Layer 2 FIB is successful.
Displays linktrace test results on the originating MEP.
3HH-11982-AAAA-TQZZA
"FD 100/320Gbps NT and FX NT IHub System
Basics, Management and OAM Guide"
Issue: 10