User's Manual

ALFOplus 24GHz (North America) - Release 01.05.0x - MN.00395.E - 004 51
Fig.19 - Hierarchical structure of maintenance domains
• A Maintenance Association (MA)
is one association which correlates the VLAN to the MD in which
the MEPs and MIPs have to be defined.
•ALFOplus
: when a specified traffic needs to be monitored, then it is necessary to relay the VLAN to
a Domain and to the corresponding MEPs or MIPs through the MA. Before creating the Maintenance
Association, the VLAN, either S-VLAN or C-VLAN, has to be specified in the VLAN Table. In each
SIAE equipment it is possible to set up to 32 different MA. Particular attention must be paid to use
the same MA label in each equipment where the MA is specified, i.e. different MA labels on the same
VLAN correspond to different MA associations.
• At the Edge of a MD there are MEPs (Maintenance End Points)
and in the middle there could be MIPs
(Maintenance Intermediate Points). MEPs are the units in charge of managing the CFM to correctly
monitor the status of the Ethernet service provided. MIPs are passive check-points that answer to
pollings coming from MEPs. MEPs will forward OAM messages coming from higher domains and will
discard OAM messages generated from lower domains.
•ALFOplus
: Each interface can be configured as MEP, Port A interface (radio interface) included. Once
chosen the interface, depending on the network topology, the direction of the MEP has to be spec-
Customer
Service
Provider
Operator 1
Operator 2
Access
Network
Operator 1
Core Network
Access
Network
MEP
CE
PE
CEPE
Operator 2
Core Network
MEP
MEP
MIP
MIP
MEP
MEP
MEP
MEP
MEP
MIP
MIP
High Level
Low Level