Configuring Queues 8 and 9 for Control Traffic

During network traffic congestion, if all traffic is dispatched with the same priority, mission critical traffic may get dropped with the same probability as lower priority traffic. To mitigate this issue, NetVisor OS allows you to configure traffic prioritization on a per port basis through Quality of Service (QoS) queues. QoS queues allow the switch to differentiate and prioritize various traffic types and avoid random loss of data. The hardware supports Strict Priority (SP) and Deficit Weighted Round Robin (DWRR) scheduling for the QoS queues.

NetVisor OS assigns default weights to each queue. However, you can view and modify these weights to suit your requirements. You can also configure data rate limits, minimum guaranteed bandwidth, and maximum bandwidth on a queue basis.

Note:  This feature is available only on NRU01, NRU02, NRU03, and NRU-S0301 platforms.

NetVisor OS version 6.0.1 introduces queues 8 and 9 to isolate user traffic from internal control traffic. In previous versions of NetVisor OS, fabric and control traffic used queues 6 and 7 which were also used by user traffic. This release eliminates the contention between user traffic and control traffic, as fabric and control messages are now moved from queues 6 and 7 to queues 8 and 9. The queues 8 and 9 are mapped to system vFlow classes control2 and control3 respectively. This feature provides improved stability and resiliency to the network especially in cases where the network is overloaded.

To enable queues 8 and 9, use the command:

CLI (network-admin@switch) > system-settings-modify cos8-and-9-queue

!!!! Please reboot the system for cos 8 and 9 queue setting to take effect correctly !!!!

Note: You must reboot the system for the queues 8 and 9 to become operational.

To view all flow classes, use the command:

CLI (network-admin@switch) > vflow-class-show

name          scope  type   priority cos

------------- ------ ------ -------- ---

meter         fabric system 0        0

class0        fabric system 0        0

class1        fabric system 1        1

class2        fabric system 2        2

class3        fabric system 3        3

class4        fabric system 4        3

class5        fabric system 5        4

class6        fabric system 6        4

class7        fabric system 7        5

guaranteed_bw fabric system 9        6

class8        fabric system 10       6

lossless      fabric system 10       6

control       fabric system 11       7

control2      fabric system 12       8

control3      fabric system 13       9