Service Manual
MA Name: test0
Level: 7
VLAN: 10
MP ID: 900
Sender Chassis ID: Force10
MEP Interface status: Up
MEP Port status: Forwarding
Receive RDI: FALSE
MP Status: Active
Setting the MP Database Persistence
To set the database persistence, use the following command.
• Set the amount of time that data from a missing MEP is kept in the continuity check database.
ECFM DOMAIN
database hold-time minutes
The default is 100 minutes.
The range is from 100 to 65535 minutes.
Continuity Check Messages
Continuity check messages (CCM) are periodic hellos.
Continuity check messages:
• discover MEPs and MIPs within a maintenance domain
• detect loss of connectivity between MEPs
• detect misconguration, such as VLAN ID mismatch between MEPs
• to detect unauthorized MEPs in a maintenance domain
CCMs are multicast Ethernet frames sent at regular intervals from each MEP. They have a destination address based on the MD
level (01:80:C2:00:00:3X where X is the MD level of the transmitting MEP from 0 to 7). All 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 lter CCMs from higher and lower domain levels as described in the following table.
Table 6. Continuity Check Message Processing
Frames at Frames from UP-MEP Action Down-MEP Action MIP Action
Less than my level Bridge-relay side or Wire
side
Drop Drop Drop
My level Bridge-relay side Consume Drop Add to MIP-DB and
forward
My level Wire side Drop Consume add to MIP-DB and
forward
Greater than my level Bridge-relay side or Wire
side
Forward Forward Forward
All the remote MEPs in the maintenance domain are dened on each MEP. Each MEP then expects a periodic CCM from the
congured list of MEPs. A connectivity failure is then dened as:
• Loss of three consecutive CCMs from any of the remote MEP, which indicates a network failure.
802.1ag
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