About the ASON Service Level Agreement in WDM Highlighted

Latest reply: Feb 19, 2020 15:29:45 564 28 7 0

Hi everyone!

I am happy to share with you about the ASON Service Level Agreement in WDM.


Traditional WDM networks are generally chains and rings. The trails and timeslots of their services are manually configured ring by ring and point by point, which consumes a lot of time and effort. As networks become increasingly large and complicated, this service configuration mode cannot meet the rapidly increasing user demands.

 

The ASON successfully solves this problem by end-to-end service configuration. To configure a service, you only need to specify its source node, sink node and protection type; the network automatically performs the required operations.

 

This post will introduce the different types of Service Level Agreement (SLA) for QoS. The service level agreement (SLA) is used to classify services according to service protection.


Diamond WDM ASON Trail


Diamond WDM ASON trails have the best protection ability. When there are enough resources on the network, diamond WDM ASON trails provide a permanent 1+1 protection for the WDM ASON diamond OCh trail, ODUk trail. Diamond services are applicable to voice and data services, VIP private lines, such as banking, security and aviation.

 

A diamond service is a service with 1+1 protection from the source node to the sink node. It is also called a 1+1 service. For a diamond service, there are two different LSPs available between the source node and the sink node. The two LSPs should be as separate as possible. One is the working LSP and the other is the protection LSP. The same service is transmitted to the working LSP and the protection LSP at the same time. If the working LSP is proper, the sink node receives the service from the working LSP; otherwise, from the protection LSP.


1

Figure 1: Diamond Services



The following rerouting policies apply to diamond services:

  1. Permanent 1+1: Rerouting triggered by the active or standby trail interruption.

  2. Rerouting 1+1: Rerouting triggered by interruption of both active and standby trails.

  3. Flex P&R: When the P budget is not exhausted, rerouting will always be triggered if either LSP fails. After the P budget is exhausted, rerouting will be triggered only when both LSPs fail. After the R budget is exhausted, rerouting will be stopped (P refers to protection times and R to rerouting times).

  4. Non-rerouting 1+1: No rerouting triggered by the active or standby trail interruption.


Dual-homing Diamond ASON Trails


Dual-homing diamond ASON trails are used to carry the same service from two different access points on the same node, providing client 1+1 protection for the service. The dual-homing diamond ASON trails are managed as one ASON service, to facilitate operation and maintenance. Dual-homing diamond ASON trails are applicable to optical-layer OCh trails and electrical-layer ODUk trails. They have the same protection capability and application as common diamond ASON trails. Dual-homing diamond ASON trails provide permanent 1+1 protection for services if sufficient resources are available.


Figure 2 shows typical application of dual-homing diamond ASON trails, where the source and destination nodes use dual-homing service access.


2

Figure 2: Application of dual-homing diamond ASON trails


Dual-homing diamond ASON trails have the same rerouting policy and features as common diamond services. In the scenario where client 1+1 protection is configured, the application of dual-homing diamond ASON services is similar to that of associated silver services. The only difference is that two services need to be managed in the associated silver service application but only one service needs to be managed in the dual-homing diamond ASON service application. Therefore, you are advised to use a dual-homing diamond ASON service in this scenario for easy maintenance or management.

 

You can convert two associated silver service trails into a dual-homing diamond ASON service trail. In this manner, you can manage only one trail, simplifying further maintenance.


Silver WDM ASON Trail


Silver WDM ASON services, including WDM ASON OCh trails, ODUk trails. The silver level service is suitable for those data or internet services that have low real-time requirement.


Silver services refer to the service connections from the source node to the destination node with the rerouting protection attribute. They are also called rerouting services. If the LSP of the silver services fails, rerouting is repeatedly initiated to restore the services until the rerouting is successful. The silver services compute the restoration tail in real time, and thus no resource needs to be reserved in advance. Hence, the bandwidth utilization is high. If there are not enough resources, the services may be interrupted.


As shown in Figure 3, A-B-G-H-I is a silver service trail. If the fiber between B and G is cut, the ASON triggers rerouting from A to create a new LSP that does not pass the cut fiber. Hence, services are protected.


3

Figure 3: A silver service


Copper WDM ASON Trail


The copper services are seldom used. Generally, temporary services, such as the abrupt services in holidays, are configured as copper services. The copper WDM ASON trails are classified into the OCh trail and ODUk trail.


Copper services are also called non-protection services. If an LSP fails, services do not reroute and are interrupted.

 

Source: https://support.huawei.com/enterprise/en/doc/EDOC1000079101?section=j004

I hope my sharing will help you!

Thanks!

  • x
  • convention:

ejcastriver
Created Jan 20, 2020 16:15:27 Helpful(0) Helpful(0)

Thanks
  • x
  • convention:

gabo.lr
gabo.lr Created Jan 21, 2020 14:03:57
You're welcome!!  
liqiang185
Admin Created Jan 21, 2020 06:21:41 Helpful(1) Helpful(1)

Thanks for sharing! 

  • x
  • convention:

gabo.lr
gabo.lr Created Jan 21, 2020 14:04:06
You're welcome!!  
EglymarB
Created Feb 3, 2020 19:09:53 Helpful(0) Helpful(0)

interesting
  • x
  • convention:

gabo.lr
gabo.lr Created Feb 16, 2020 14:44:05
Thanks!  
Faridrami
Created Feb 12, 2020 16:23:05 Helpful(0) Helpful(0)

Thanks for sharing
  • x
  • convention:

gabo.lr
gabo.lr Created Feb 12, 2020 16:24:03
You're welcome!!  
EdimarG
Created Feb 13, 2020 23:44:52 Helpful(0) Helpful(0)

thanks!!
  • x
  • convention:

gabo.lr
gabo.lr Created Feb 16, 2020 14:44:40
You're welcome!!  
arifinul
Created Feb 14, 2020 08:23:21 Helpful(0) Helpful(0)

thank you , so informative.
  • x
  • convention:

gabo.lr
gabo.lr Created Feb 18, 2020 13:59:32
You're welcome!!  
NACA4412
Created Feb 15, 2020 23:36:20 Helpful(0) Helpful(0)

Thanks for sharing
  • x
  • convention:

gabo.lr
gabo.lr Created Feb 18, 2020 13:59:43
You're welcome!!  
lucian2003
MVE Created Feb 16, 2020 00:28:13 Helpful(0) Helpful(0)

Very good, always reusing the good of previous technologies.
  • x
  • convention:

gabo.lr
gabo.lr Created Feb 18, 2020 14:00:02
Thanks  
Hello%20friends%2C%20I%20am%20a%20Telecommunications%20and%20electronics%20engineer%20and%20I%20just%20graduated%20as%20a%20master%20in%20telecommunications%20systems.%20I%20work%20in%20the%20telecommunications%20company%20of%20Cuba%2C%20ETECSA.%20I%20am%2035%20years%20old%20and%20I%20attend%20the%20transport%20network%20in%20my%20province%2C%20which%20is%20mainly%20Huawei.
umaryaqub
MVE Created Feb 16, 2020 00:59:09 Helpful(0) Helpful(0)

Thanks for sharing
  • x
  • convention:

gabo.lr
gabo.lr Created Feb 18, 2020 14:00:14
You're welcome!!  
12
Back to list

Comment

Reply
You need to log in to reply to the post Login | Register

Notice Notice: To protect the legitimate rights and interests of you, the community, and third parties, do not release content that may bring legal risks to all parties, including but are not limited to the following:
  • Politically sensitive content
  • Content concerning pornography, gambling, and drug abuse
  • Content that may disclose or infringe upon others ' commercial secrets, intellectual properties, including trade marks, copyrights, and patents, and personal privacy
Do not share your account and password with others. All operations performed using your account will be regarded as your own actions and all consequences arising therefrom will be borne by you. For details, see " Privacy."
If the attachment button is not available, update the Adobe Flash Player to the latest version!

My Followers

Login and enjoy all the member benefits

Login and enjoy all the member benefits

Login