Assigning PG Bandwidth for the MZ912

The MZ912 supports the ETS feature. This feature assigns port transmitting bandwidth based on PGs.

The MZ912 supports eight CoSs (priorities) and eight PGs. Each PG contains one to eight CoSs. By default, the MZ912 uses PG0 and PG1. PG0 contains CoS0, CoS1, CoS2, CoS4, CoS5, CoS6, and CoS7, and PG1 contains CoS3. The committed bandwidth of PG0 and PG1 is 50%, that is, 5 Gbit/s. If either PG is idle, one PG can borrow the transmitting bandwidth of the other PG and its maximum transmitting bandwidth can reach 10 Gbit/s.

PG1 and CoS3 are used to transmit FCoE traffic, and PG0 and other CoSs are used to transmit common Ethernet service traffic. The NIC ports of the MZ912 support only the Ethernet service. Therefore, all PGs and CoSs are used for Ethernet traffic. The FCoE ports of the MZ912 support only the storage service. Therefore, only one PG and one CoS are required for FCoE traffic.

You can use OCM to set the PG bandwidth and the mapping between PGs and CoSs.

1. Open OCM, select a physical port on the MZ912, and click the DCB tab. On this tab page, you can view the PG bandwidth assignment information of the MZ912, as shown in Figure 4-59.
   Figure 4-59 DCB tab page
   
   
2. Click Configure DCB. The Configure DCB window is displayed.
   Figure 4-60 Configuring PG bandwidth for the MZ912
   
   

By default, DCBX is enabled for MZ912 ports. When DCBX is enabled, the MZ912 can negotiate DCB parameters (such as PFC and ETS) with the peer device (switch module). To change the PG transmitting bandwidth, disable DCBX first by deselecting the Enabled check box in the DCBX Setting area.

The sum of the bandwidth of PGs for the MZ912 must be 100%.