Web Management Guide-R01

Table Of Contents
Chapter 13
| Basic Administration Protocols
Ethernet Ring Protection Switching
– 471 –
Ring nodes C and D, that are common to both ERP1 and ERP2, are called
interconnection nodes. The ring link between the interconnection nodes are
controlled and protected by the ring it belongs to. In the example for the Normal
Condition, the ring link between ring nodes C and D is part of ERP1, and, as such,
are controlled and protected by ERP1. Ethernet characteristic information traffic
corresponding to the traffic channel may be transferred over a common Ethernet
connection for ERP1 and ERP2 through the interconnection nodes C and D.
Interconnection nodes C and D have separate ERP Control Processes for each
Ethernet Ring.
Figure 309 on page 471 (Signal Fail Condition) illustrates a situation where
protection switching has occurred due to an SF condition on the ring link between
interconnection nodes C and D. The failure of this ring link triggers protection only
on the ring to which it belongs, in this case ERP1. The traffic and R-APS channels are
blocked bi-directionally on the ports where the failure is detected and bi-
directionally unblocked at the RPL connection point on ERP1. The traffic channels
remain bi-directionally blocked at the RPL connection point on ERP2. This prevents
the formation of a loop.
Figure 309:
Ring Interconnection Architecture (Multi-ring/Ladder Network)
Configuration Guidelines for ERPS
1. Create an ERPS ring (Configure Ring – Add): The ring name is used as an index
in the G.8032 database. Specify the east and west interfaces. Each node on the
ring connects to it through two ring ports. Configure one port connected to the
next node in the ring to the east (or clockwise direction) and another port
facing west in the ring.
2. Configure VLAN groups to assign to specific ERPS instances (Configure VLAN
Group – Add).
3. Create ERPS instances (Configure Instance – Add): Specify an instance name
and optionally an ID number.
ring node Aring node B
ring node C ring node D
ring node F ring node E
ERP1
ERP2
RPL
RPL
RPL Owner
Node
for ERP1
RPL Owner
Node
for ERP2
ring link
(ERP1)
ring no de Aring node B
ring node C ring no de D
ring node F ring node E
ERP1
ERP2
RPL
RPL
RPL Owner
Node
for ERP1
RPL Owner
Node
for ERP2
ring link
(ERP1)
FAILURE
Normal Condition Signal Fail Condition