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Chapter 9 CFM Commands
Ethernet Switch CLI Reference Guide
51
9.3 User Input Values
This section lists the common term definition appears in this chapter. Refer to User’s Guide
for more detailed information about CFM.
MEP An MEP (Maintenance End Point) port has the ability to send and reply to the
CCMs, LBMs and LTMs. It also gets other MEP port information from neighbor
switches’ CCMs in an MA.
MIP An MIP (Maintenance Intermediate Point) port forwards the CCMs, LBMs, and
LTMs and replies the LBMs and LTMs by sending Loop Back Responses (LBRs)
and Link Trace Responses (LTRs).
Connectivity
Check
Connectivity Check (CC) enables an MEP port sending Connectivity Check
Messages (CCMs) periodically to other MEP ports. An MEP port collects CCMs to
get other MEP information within an MA.
Loop Back Test Loop Back Test (LBT) checks if an MEP port receives its LBR (Loop Back
Response) from its target after it sends the LBM (Loop Back Message). If no
response is received, there might be a connectivity fault between them.
Link Trace Test Link Trace Test (LTT) provides additional connectivity fault analysis to get more
information on where the fault is. In the link trace test, MIP ports also send LTR
(Link Trace Response) to response the source MEP port’s LTM (Link Trace
Message). If an MIP or MEP port does not respond to the source MEP, this may
indicate a fault. Administrators can take further action to check and resume
services from the fault according to the line connectivity status report.
Table 26 CFM Term Definitions
TERM DESCRIPTION
Table 27 CFM command user input values
USER INPUT DESCRIPTION
mep-id This is the maintenance endpoint identifier (1~8191).
ma-index This is the maintenance association (MA) index number
(1~4294967295).
md-index This is the maintenance domain (MD) index number
(1~4294967295).
mac-address This is the remote maintenance endpoint’s MAC address or a
virtual MAC address assigned to a port.
A switch has one or two MAC addresses only. If you do not use
virtual MAC addresses with CFM, all CFM ports will use the
Switch’s MAC address and appear as one port. If you want
unique CFM ports, you need to assign virtual MAC addresses. If
you use virtual MAC addresses, make sure that all virtual MAC
addresses are unique in both the switch and the network to which
it belongs.