H3C S5120-EI series Configuration Manual

Also see for S5120-EI Series: Configuration guide Installation manual Configuration guide Configuration guide Operation manual

Contents

H3C S5120-EI series Configuration Manual Manual pdf 76 page image

66• On a per-port basis—As illustrated by the vertical lines in Figure 21, the switch automatically dividesthe dedicated resource among all ports evenly.• On a per-queue basis—As illustrated by the horizontal lines in Figure 21, the dedicated resource ofeach port is proportionately allocated among the queues on it and all ports use the same allocationscheme. The percentage of the resource allocated to a queue is called the minimum guaranteedresource percentage of the queue.The shared buffer in the cell resource can buffer the bursty traffic on ports. The shared resource is sharedby all queues of all ports. When a certain queue of a port is congested because its dedicated cellresource gets full, it can use a certain portion of the shared resource of the cell resource. The maximumshared resource size available for a queue is defined as a percentage of the shared resource. After thebursty traffic is transmitted, the shared resource used by the bursty traffic is released for other ports orqueues to use. For example, you can configure port 1 to use 30% of the shared buffer of the cell resource.You can perform the following parameters for the cell resource:• Configure the shared resource size• Configure the minimum guaranteed resource size for a queue• Configure the maximum shared resource size for a portPacket resource allocationDifferent from the cell resource, the packet resource does not have a shared resource, and the wholebuffer is evenly allocated to ports, as shown in Figure 22.Figure 22 Packet resource allocation on the S5120-EI switchLike the packet resource, the cell resource is also allocated on a per-port basis and on a per-queue basis.Because the packet resource does not have the shared resource, you can adjust only the percentage ofthe queue buffer to the port buffer, which is called the minimum guaranteed buffer percentage.Data buffer configuration approachesYou can configure the data buffer on the S5120-EI Switch Series in one of the following approaches:• Using the burst function to configure the data buffer setup• Manually configuring the data buffer setupNOTE:The two approaches are mutually exclusive. If the data buffer setup has been configured in one approach,you must remove the present configuration first before you use the other approach.Queue 0Queue 1Queue 2Queue 3Queue 4Queue 5Queue 6Queue 7Port 1 Port 2 Port 3 ……Dedicatedbuffer