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OSN 500 550 580 V100R008C50 Commissioning and Configuration Guide 02

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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
Notes for Ethernet Service Configurations

Notes for Ethernet Service Configurations

You need to consider the service support capability of the boards used by the equipment and the configuration requirements during the configuration process.

Service Support Capability of Ethernet Boards

Ethernet boards are classified into Ethernet transparent transmission boards and Ethernet switching boards, based on the type of the accessed service. The Ethernet transparent transmission boards support only EPL services, whereas the Ethernet switching boards support EPL services, EVPL services, and Layer 2 switching function.

Table 2-152  Service support capability of Ethernet boards

Board Type

Board Name

Supported EPL Service

Supported EPLAN Service

Ethernet transparent transmission board

EGT1

EPL

-

Ethernet switching board

EFS8

EPL

EVPL

EVPLAN (IEEE 802.1q bridge), EPLAN (IEEE 802.1d bridge), and EVPLAN (IEEE 802.1ad bridge)

Ethernet switching board

EGS4

EPL

EVPL

EVPLAN (IEEE 802.1q bridge), EPLAN (IEEE 802.1d bridge), and EVPLAN (IEEE 802.1ad bridge)

Requirements for Binding Paths with VCTRUNKs on Ethernet Boards

One VCTRUNK on an Ethernet board can only be bound with timeslots of the same level.

Table 2-153  Requirements for binding paths with VCTRUNKs on Ethernet boards
Board Requirement for Binding Paths with a VCTRUNK

EGT1

Maximum number of VCTRUNKs supported by one EGT1 board: 1

Configuration principles are as follows:

VC-4 numbered 4 of the board support the binding of VC-3 and VC-12 paths. The other VC-4s support the binding of VC-3 paths only.

EFS8

Maximum number of VCTRUNKs supported by one EFS8 board: 8

Configuration principles are as follows:

VC-4 numbered 4 of the board support the binding of VC-3 and VC-12 paths. The other VC-4s support the binding of VC-3 paths only.

EGS4

Maximum number of VCTRUNKs supported by one EGS4 board: 64

Configuration guidelines are as follows:

  • VC-4s numbered 1-4 of the board support the binding of VC-3 and VC-12 paths. The other VC-4s support the binding of only VC-3 paths.
  • One EGS4 board supports a maximum of 16 VC-4s. The actual number of VC-4s supported by an EGS4 board varies according to the access capacity of the slot housing the EGS4 board.
  • If the slot access capacity is 1.25 Gbit/s, the first to eighth VC-4s are supported. If the slot access capacity is 2.5 Gbit/s, the first to sixteenth VC-4s are supported.

Ethernet Service Bandwidths Carried by VCTRUNKs of Ethernet Boards

To determine the level of the bandwidths to be bound with a VCTRUNK and the number of paths that are required for an Ethernet service, you need to calculate the theoretical bandwidth of the Ethernet service that can be carried by a VCTRUNK.

Bandwidth = Number of paths bound with the VCTRUNK x Payload rate of the binding granularity x Encapsulation efficiency of the encapsulation protocol

The payload rate of the VC-12 is 2.176 Mbit/s; the payload rate of the VC-3 is 48.384 Mbit/s; the payload rate of the VC-3 is 149.760 Mbit/s.

GFP encapsulation efficiency has different values in the following two scenarios:
  • GFP encapsulation efficiency = Ethernet frame length/(Ethernet frame length + 12-byte overhead), when the GFP protocol uses FCS32 as the check field.
  • GFP encapsulation efficiency = Ethernet frame length/(Ethernet frame length + 8-byte overhead), when the GFP protocol does not add the check field.
NOTE:

When the Ethernet board uses the GFP protocol to encapsulate Ethernet services, you can determine whether a check field is used during the encapsulation by setting the Check Field Length parameter. By default, FCS32 is used as the check field. In this case, if the Ethernet board uses the default GFP parameter settings, the theoretical bandwidth of the VCTRUNK bound with five VC-12 paths is 10.938 Mbit/s when the Ethernet frame length is 1500 bytes and the theoretical bandwidth of the VCTRUNK bound with five VC-12 paths is 12.025 Mbit/s when the Ethernet frame length is 64 bytes.

In actual situations, you can estimate the level and quantity of the paths according to the following principle: One VC-12 path carries 2 Mbit/s services; one VC-3 path carries 48 Mbit/s services; one VC-4 path carries 150 Mbit/s services. For example, in the case of a 10 Mbit/s Ethernet service, the VCTRUNKs can be bound with five VC-12 paths.

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Updated: 2019-01-21

Document ID: EDOC1100020976

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