Enabling Ccm - Dell S4048T Configuration Manual

MEPs must listen to these multicast MAC addresses and process these messages. MIPs may optionally process
the CCM messages the MEPs originate and construct a MIP CCM database.
MEPs and MIPs filter CCMs from higher and lower domain levels as described in the following table.
Table 7. Continuity Check Message Processing
Frames at Frames from
Less than my level Bridge-relay side or
Wire side
My level Bridge-relay side
My level Wire side
Greater than my Bridge-relay side or
level Wire side
All the remote MEPs in the maintenance domain are defined on each MEP. Each MEP then expects a periodic
CCM from the configured list of MEPs. A connectivity failure is then defined as:
• Loss of three consecutive CCMs from any of the remote MEP, which indicates a network failure.
• Reception of a CCM with an incorrect CCM transmission interval, which indicates a configuration error.
• Reception of a CCM with an incorrect MEP ID or MAID, which indicates a configuration or cross-
connect error. This error could happen when different VLANs are cross-connected due to a
configuration error.
• Reception of a CCM with an MD level lower than the receiving MEP, which indicates a configuration or
cross-connect error.
• Reception of a CCM containing a port status/interface status TLV, which indicates a failed bridge or
aggregated port.
The continuity check protocol sends fault notifications (Syslogs, and SNMP traps, if enabled) whenever you
encounter any of the these errors.

Enabling CCM

To enable CCM, use the following commands.
1 Enable CCM.
ECFM DOMAIN mode
no ccm disable
The default is Disabled.
2 Configure the transmit interval (mandatory). The interval specified applies to all MEPs in the domain.
ECFM DOMAIN mode
ccm transmit-interval seconds
UP-MEP Action Down-MEP Action
Drop Drop
Consume Drop
Drop Consume
Forward Forward
MIP Action
Drop
Add to MIP-DB and
forward
add to MIP-DB and
forward
Forward
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