EN
31
Node
A
Node
B
Node
D
Node
C
Working
Working
Working
R
ing
P
rotection
L
ink
CCM
CCM
CCM
Figure 2-14: Normal ring operation
Any failure along the ring causes a CCM fault at the failure link adjacent nodes (nodes D and C in the example). These nodes after having blocked
the ports facing the failure link, generate multicast an RAPS message via CPU on the dedicated VLAN, which is received by all other nodes on the
ring, including nodes adjacent to RPL, in this case nodes A and B.
Nodes receiving the RAPS message send a copy to the Ethernet Ring Protection (ERP) entity and also forward the received RAPS to the next node
Node
A
Node
B
Node
D
Node
C
Failure
Working
Working
CCM
x
RAPS
RAPS
R
ing
P
rotection
L
ink
Figure 2-15: Link failure
Upon receiving the RPAS signal failure message Node A and B adjacent to RPL unblocks the RPL ports and traffic flows through the RPL.
Node
A
Node
B
Node
D
Node
C
Failure
Working
Working
CCM
CCM
CCM
CCM
x
RAPS
RAPS
R
ing
P
rotection
L
ink
Figure 2-:16 Ring Protection Link operation
Содержание OLT 769401
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