Purpose
Command or Action
•
A port with a MIP at a lower level cannot have maintenance points at a higher level.
A port with a MEP at a lower level should have either a MIP or MEP at a higher level.
Follow these steps:
Determine service provider
MIPs.
Step 3
•
Starting at the lowest service provider level domain, assign service provider MIPs at
the NNI between operators (if more than one).
•
Proceed to next higher service provider level and assign MIPs.
•
A port with a MIP at a lower level cannot have maintenance points at a higher level.
A port with a MEP at a lower level should not have either a MIP or a MEP at a higher
level.
Follow these steps:
Determine service provider
MEPs.
Step 4
•
Starting at the lowest service provider level domain, assign a MEP at every UNI that
is part of a service instance.
•
Proceed to next higher service provider level and assign MEPs.
•
A port with a MIP at a lower level cannot have maintenance points at a higher level.
A port with a MEP at a lower level should have either a MIP or a MEP at a higher
level.
Customer MIPs are allowed only on the UNIs at the uPEs if the service provider allows the
customer to run CFM. Otherwise, the service provider can configure Cisco devices to block
CFM frames.
Determine customer MIPs.
Step 5
•
Configure a MIP on every uPE, at the UNI port, in the customer maintenance domain.
•
Ensure the MIPs are at a maintenance level that is at least one higher than the highest
level service provider domain.
Customer MEPs are on customer equipment. Assign an outward facing MEP within an
outward domain at the appropriate customer level at the handoff between the service provider
and the customer.
Determine customer MEPs.
Step 6
Examples
The figure below shows an example of a network with a service provider and two operators, A and B. Three
domains are to be established to map to each operator and the service provider. In this example, for simplicity
we assume that the network uses Ethernet transport end to end. CFM, however, can be used with other
transports.
Carrier Ethernet Configuration Guide (Cisco ASR 920 Series)
254
Configuring Ethernet CFM
Designing CFM Domains
Содержание ASR 920 series
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