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Planning Network Protection

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Planning Network Protection

Postby jorna » Thu Apr 06, 2017 10:08 pm

Basic Principles
Users can choose proper network protection schemes according to the features of network
protection schemes and application scenarios.
Adhere to the following principles when planning network protection.
At the access layer, the service capacity is small, and most services are converged at a
central node. Thus, the unidirectional SNCP ring is applicable.
In the case of the inter-office communication, the service capacity of each node is large,
and a larger service adding/dropping capability is required. Thus, the bidirectional MSP
ring is applicable.
When services on the ring are discrete, the two-fiber bidirectional MSP is applicable. In
the case of extreme situations, when services only travel between two adjacent nodes, the
maximum service capacity on the ring is STM-N x K/2 ( "K" represents the number of
nodes). In this case, the resource utilization is large. However, the MSP, which needs the
support of the automatic protection switching (APS) protocol, has complex protection
mechanisms and strict network maintenance requirements.
The MSP can protect node failures.
The optical-path-shared MSP ring protects services in VC-4 granularities. This protection
scheme is used for services of a large volume. Generally, this scheme is used for the services
at Huawei STM-64 and STM-16 levels.
The SNCP scheme is applied to protect services at the VC-4, VC-3 or VC-12 level. Hence,
the SNCP scheme has more flexibility.
The SNCP is the 1+1 protection, and the SNCMP is the N+1 protection, in which multiple
protection channels protect one working channel.
The SNCTP scheme is applied to protect services at the VC-4 path. When the working
channel is faulty, services are switched to the protection channels.
The SNCTP is mainly used at the backbone layer and the convergence layer. Compared to
the MSP, the SNCTP requires a simplified network topology.
In the case of the inter-ring and ring with chain services, the SNCP, SNCMP, SNCTP or
MSP is applicable.
Protection schemes for the chain network include the 1+1 linear MSP and the 1:N linear
MSP. In the case of 1:N linear MSP, protection routes can carry extra services. Thus, the
network utilization is enhanced. When rapid service restoration after the switching is
required, the 1+1 protection is applicable.
The DNI is mainly used on intersecting rings and at gateway nodes with great service
capacity, or used for connecting tandem offices. The primary advantage of the DNI is that
it provides protection when multi-node failures occur.
Huawei OptiX OSN 2500 supports network protection schemes for the SDH service, the Ethernet
service, and the ATM service.
When planning the MSP ring for the OptiX OSN 2500, first consider the capabilities of
supporting the MSP ring.
The OptiX OSN 2500 supports the following types of MSP rings.
Four-fiber bidirectional MSP ring
Two-fiber bidirectional MSP ring
Two-fiber unidirectional MSP ring
The MSP ring of the OptiX OSN 2500 supports the following functions.
The MSP ring supports the in-service MS bandwidth expansion without interrupting
services (for example, upgrading the MSP ring at the STM-4 level to the MSP ring at the
STM-16 level).
Boards that carry STM-16 services support configuring a single optical interface into a
maximum of two MSP rings.
The MSP ring supports the MS suppression at the VC-4 level.
The OptiX OSN 2500 supports a maximum of 12 MSP protection ring groups.
jorna
Cisco 2611XM
 
Posts: 129
Joined: Tue Jul 07, 2015 1:23 am

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