Alcatel-Lucent 7750 SR - Loopback; Figure 27: CFM Loopback

Ethernet Connectivity Fault Management (ETH-CFM)
Page 104 7750 SR OS Services Guide
Loopback
A loopback message is generated by an MEP to its peer MEP or an MIP. The functions are similar
to an IP ping to verify Ethernet connectivity between the nodes.
Figure 27: CFM Loopback
The following loopback-related functions are supported:
• Loopback message functionality on an MEP or MIP can be enabled or disabled.
• MEP — Supports generating loopback messages and responding to loopback messages
with loopback reply messages.
• MIP — Supports responding to loopback messages with loopback reply messages when
loopback messages are targeted to self.
• Displays the loopback test results on the originating MEP.
Fig_14
MEP1
MEP1 MEP3MEP2 MEP5
MEP11
Loopback
Messages
Loopback
Reply Messages
MEP4 MEP7
Bridge
Port
MIP
MEP
MEP6 MEP8
MEP10 MEP3
MEP2 MEP12
MEP4