Ethernet Ring Sub-Rings - Alcatel-Lucent 7210 SAS M Service Manual

Service Entities

Ethernet Ring Sub-Rings

Ethernet Sub-Rings offer a dual redundant way to interconnect rings. The 7210 SAS supports Sub-
Rings connected to major rings and a sub-ring connected to a VPLS (LDP based) for access rings
support in VPLS networks.
scenario, any link can fail in either ring (ERP1 or ERP2) and each ring is protected. Furthermore,
the sub ring (ERP2) relies on the major Ring (ERP1) as part of its protection for the traffic from C
and D. The nodes C and D are configured as inter connection nodes.
RPL Node RPL Node
Ring Link Ring Link
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Figure 9
B B
RPL Link ERP1 RPL Link ERP1
a a
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b b
ERP1 ERP1
a a
Inter connection Link Inter connection Link
C C
b b
Virtual channel Virtual channel
Or Non-Virtual channel Or Non-Virtual channel
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a a sub-ring port sub-ring port
ERP2 ERP2
a a
E E
b b
RPL Link ERP2 RPL Link ERP2
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Ring APS – ERP – Control Channel Ring APS – ERP – Control Channel
Ring Data Channels Ring Data Channels
illustrates a Major ring and Sub Ring scenario. In this
A A
a a RPL Owner Node RPL Owner Node
ERP1 ERP1
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b b
b b
D D
a a
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sub-ring port sub-ring port
a a
a a
F F
RPL Owner Node RPL Owner Node
b b
ERP2 ERP2
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7210 SAS M Services Guide