246 G8264 Application Guide for ENOS 8.4Queuing and SchedulingThe G8264 has 8 output Class of Service (COS) queues per port. If CEE is enabled,this is changed to 3 queues per port and ETS is then used to configure thescheduling in a manner different than what is described in this section. Eachpacket’s 802.1p priority determines its COS queue, except when an ACL action setsthe COS queue of the packet.Notes: In stacking mode, because one COS queue is reserved for internal use, thenumber of configurable COS queues is either 1 or 7. When vNIC operations are enabled, the total number of COS queues available is4.You can configure the following attributes for COS queues: Map 802.1p priority value to a COS queue Define the scheduling weight of each COS queueYou can map 802.1p priority value to a COS queue, as follows:To set the COS queue scheduling weight, use the following command:Control Plane ProtectionControl plane receives packets that are required for the internal protocol statemachines. This type of traffic is usually received at low rate. However, in somesituations such as DOS attacks, the switch may receive this traffic at a high rate. Ifthe control plane protocols are unable to process the high rate of traffic, the switchmay become unstable.The control plane receives packets that are channeled through protocol‐specificpacket queues. Multiple protocols can be channeled through a common packetqueue. However, one protocol cannot be channeled through multiple packetqueues. These packet queues are applicable only to the packets received by thesoftware and does not impact the regular switching or routing traffic. Packet queuewith a higher number has higher priority.You can configure the bandwidth for each packet queue. Protocols that share apacket queue will also share the bandwidth.RS G8264(config)# qos transmit queue mapping <802.1p priority value (0‐7)> (0‐7)>RS G8264(config)# qos transmit queue weight cos number>‐15)>
