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OSN3500 SSN1EMS4 Shaping Parameters - For the N1EMS4, N1EGS4, N3EGS4, N4EGS4, and N3GES2 single boards, there are four queues for each port, and each queue has traffic shaping Shaping, which needs to be set up with the following parameters Guaranteed bandwidth and additional burst buffer size. For N1EAS2 and N3EAS2 single boards, each port has 8 queues, and each queue has the function of Traffic Shaping Shaping, and the parameters to be set include Guaranteed Bandwidth and Peak Bandwidth. If the parameter guaranteed bandwidth is set too high, the shaping effect is not good; the extra burst buffer size can be set large to cache more burst messages, but the delay of the cached messages on the port will be extended.
Guaranteed Bandwidth
- N1EMS4/N1EGS4/N3EGS4/N4EGS4/N3GES2: positive integer from 0 to 2499968, with a step size of 64, unit kbit/s
- N1EAS2/N3GES2: 0 to 10485760 positive integers in steps of 64, in kbit/s
- N1EFP0:64 to 100032 positive integers, step size of 64, unit kbit/s
- N1EGSH: positive integer from 0 to 1048576 in steps of 64, in kbit/s
The service is interrupted when Shaping is enabled for the outgoing port queue of the OSN15000 N1EMS4 single board.
Cause Analysis
The possible causes are:
- In this case, queue 3 of VCTRUNK1 has a higher priority than queue 1. Messages from the higher priority queue 3 grab all possible bandwidth (300M) so that there is no remaining bandwidth to allocate to the lower priority queue 1, resulting in the interruption of D and D' services.
- Queue 1 has only enabled Shaping without configuring Shaping bandwidth, and the default Shaping bandwidth is 0, so it will break service.
OptiX OSN 3500
OptiX OSN 3500 II
Fault Class
- RPR
- Ethernet Failure
Phenomenon Description
The specifics of the EVPL service for the shared VCTRUNK of NE2 and NE3 are shown in Figure 1.
2 pairs of customers (D and D', E and E') share the 300M bandwidth of VCTRUNK1.
- Streams are created at PORT1 and PORT2 respectively, and the stream type is Port Stream.
- Create a CoS of type "simple" and schedule the port flow of PORT1 to queue 1 of VCTRUNK1 and the port flow of PORT2 to queue 3 of VCTRUNK1.
- Enable traffic shaping for the 3rd queue of VCTRUNK1 and configure the CIR to be 300M bit/s.
- Enable traffic shaping for the 1st queue of VCTRUNK1, using the default Shaping configuration parameters.
If the traffic into PORT2 reaches 300M bit/s at this time, the service interruption for PORT1 is found. So even if there is remaining bandwidth, it cannot be allocated to queue 1.
Operation Steps
- Possible Cause 1: High-priority queue 3 messages grab all possible bandwidth.
- Turn down the bandwidth of the high-priority queue appropriately.
- Right-click on the network element icon in the main view and select "Network Element Manager".
- Select the corresponding Ethernet board in the navigation tree, and select "Configuration > Qos Management > Port Shaping Management" in the function tree.
- Set the committed bandwidth and burst size (less than 300M).
- Turn down the bandwidth of the high-priority queue appropriately.
- Possible Cause 2: Queue 1 has only enabled Shaping without configuring Shaping's committed bandwidth (CIR).
- Configure the Shaping bandwidth for queue 1.
- Right-click on the network element icon in the main view and select "Network Element Manager".
- Select the corresponding Ethernet board in the navigation tree, and select "Configuration > Qos Management > Port Shaping Management" in the function tree.
- Select Queue 1 and configure the parameters.
- Configure the Shaping bandwidth for queue 1.
Reference Information
Similar issue: one of the possible reasons for service interruption after binding CAR to a flow is that CAR is enabled, but the CIR and PIR of CAR are not configured (default is 0), so the service will be interrupted.
The technical information in this chapter and the related SDH equipment troubleshooting procedures are provided by Shenzhen Optical Transmission Network Technology Co. Huawei SDH optical transmission equipment, SDH transmission equipment sales phone: 13430988088 Welcome to call!
