Issue Description
At the customer's site, eight ports on each of the two OceanStor SNS2248 switches are configured as two trunks and interconnected, respectively. However, the rate of some ports in the trunks decreases, as displayed on the switches.
The customer raises the following questions:
1. In a normal trunk, is there a port that is the trunk master?
2. In a normal trunk (the rate of each port is 16 Gbit/s), there is only one trunk master. However, there are two trunk masters. Are there two trunks (the rate of ports in one trunk is 16 Gbit/s and the rate of ports in the other trunk is 8 Gbit/s)? In this case, which trunk is used for running services? Is there a selection mechanism?
3. In the figure, the rate of ports 40 and 46 is 8 Gbit/s. Why?
Solution
1. In normal cases, one trunk has only one trunk master.
2. In the current trunk, two port rates appear and then two trunks are generated by port rate. Therefore, two trunk masters are generated.
Services are running on both trunks. The running services are automatically selected based on internal routes.
3. A trunk is formed on one port. The rate is 8 Gbit/s, and the rate of other ports are not forced to be 8 Gbit/s. For a trunk, if the rate of only one link is not 8 Gbit/s, the link itself is a trunk and it is a trunk master. The rate of ports 40 and 46 are automatically negotiated to 8 Gbit/s.
If the port rate decreases, the optical module may be faulty or the cable may be faulty. In this case, the customer needs to replace components for troubleshooting.
