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[5] MPLS (PR_EA) ports protection
(see Figure 189. on page 332)
The MPLS boards (PR_EA MATRIX 4xETHERNET, PR_EA MATRIX 1xGIGABIT ETHERNET) can be
protected in 1+1 equipment protection scheme (EPS) against board failure.
The 1+1 EPS cannot be applied to the local interfaces (4xethernet, gigabit ethernet). In case of failure the
traffic carried by the ethernet local ports will be lost.
In this configuration when the working PR_EA Matrix...board fails the spare becomes active and the
indirect interfaces are rerouted to it.
The traffic from the ethernet local interface is lost.
Only one protection group 1+1 not revertive can be created, depending on the equipment configuration.
The spare card position can be assigned in a flexible way; no restrictions for position of main and spare
PR_EA boards are present.
The 1+1 EPS protection scheme of PR_EA boards is the same of ATM boards one.
Figure 189. on page 332 gives some examples of EPS protection scheme.
The PR_EA EPS is managed by SDH EC, SC, Platform and PR_EA EC. In outline the management can
be divided in:
•
SDH side Management: involving SDH EC, SC and Platform, it mainly applies to the Equipment
Domain of the PR_EA... board.
In particular:
–
SDH EC: management of Equipment Protection Groups and interface towards the SDH
Network Management System (e. g. creation of Protection Schemes, operator
commands, autoswitch notifications)
–
SC/ Platform: management of HW
•
MPLS side Management: involving PR_EA... EC, it mainly applies to the MPLS Transmission
Domain of the PR_EA... board.
Figure 190. on page 333 represents the messages exchanged between the EC (on the PQ2/EQC board)
and the PR_EA Matrix... boards in protection group.
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