QoS configuration within the localized information coverage is used to carry out scheduling and queuing capabilities. QoS is usually utilized by community directors to reduce delay and jitter for business-critical purposes resembling VoIP and video conferencing, and it’s used to prioritize the queuing and forwarding of particular site visitors courses. It may also be used to handle buffer allocation throughout various kinds of site visitors, in addition to to find out the congestion administration habits when the buffers are full.
Steps of QoS Configuration
Configuring a QoS coverage on a WAN Edge router is an easy course of that consists of the next steps:
Step 1. Assign site visitors to forwarding courses
Step 2. Map forwarding courses to {hardware} queues
Step 3. Configure the scheduling parameters for every queue
Step 4. Name the entire schedulers collectively right into a single QoS map
Step 5. Configure the interface with the QoS map
Step 1: Assign Site visitors to Forwarding Lessons
Step one within the QoS course of is to assign site visitors flows to totally different forwarding courses. This step might be carried out with both a centralized information coverage or with an Entry Management Record from a localized information coverage by specifying the category motion. Under is the configuration:
Instructions |
Description |
|
Coverage sequence XX match dscp 40 46 motion settle for class (Title) |
Configuration of sophistication with match sequence and motion. |
Step 2. Map forwarding courses to {hardware} queues
The following step within the forwarding course of is to assign the forwarding courses to their {hardware} queues. This configuration is achieved within the GUI by creating a brand new kind of localized coverage checklist, the category map. The category map configuration references the title of the courses that had been configured in Step 1 and the particular {hardware} queue that this site visitors will probably be forwarded via.
Instructions |
Description |
|
class-map class BEST_EFFORT queue 7 class CRITICAL_DATA queue 1 class VOICE_AND_VIDEO queue 0 |
Configuration of sophistication map and assigning queuing to every class. |
Step 3. Configure the scheduling parameters for every queue
The following step within the course of is to configure the scheduling parameters for every particular person queue. Every scheduler will include a reference to the site visitors class, the utmost bandwidth share for use throughout congestion, the proportion of the buffer measurement that’s allotted, the scheduling approach (Low Latency Queuing or Weighted Spherical Robin), and the congestion administration approach (tail drop or random early detection).
Instructions |
Description |
| qos-scheduler VOICE_AND_VIDEO_SCHED
class VOICE_AND_VIDEO bandwidth-percent 20 buffer-percent 20 scheduling llq drops tail-drop ! qos-scheduler CRITICAL_DATA_SCHED class CRITICAL_DATA bandwidth-percent 30 buffer-percent 40 scheduling wrr drops red-drop ! qos-scheduler BEST_EFFORT_SCHED class BEST_EFFORT bandwidth-percent 50 buffer-percent 40 scheduling wrr drops red-drop |
Configuration of scheduler w.r.t service and allocation of bandwidth and buffer measurement and strategy of scheduling with determined motion. |
Step 4. Name the entire schedulers collectively right into a single QoS map
The ultimate configuration step within the localized coverage for a QoS configuration is to name the entire schedulers along with a single QoS map that may be referenced below the interface configuration.
Instructions |
Description |
| qos-map MY_QOS_MAP
qos-scheduler VOICE_AND_VIDEO_SCHED qos-scheduler CRITICAL_DATA_SCHED qos-scheduler BEST_EFFORT_SCHED |
Mapping of all scheduler configured with major QoS. |
Step 5. Configure the interface with the QoS map
Apply the QoS on interface. That is the final step within the course of. QoS maps might be utilized to any interface to have an effect on the scheduling and queuing of egress site visitors. Nonetheless, the assigned WAN bandwidth is usually decrease than LAN bandwidth and therefore, congestion is almost definitely to happen on the WAN, QoS maps are mostly configured on the transport (WAN) interfaces.
Instructions |
Description |
| interface ge0/1
qos-map MyQoSMap |
Apply the QoS on outbound site visitors from WAN interface. QoS map utilized on all site visitors passing from this interface. |
Verification Instructions of QoS
Instructions |
Description |
| present coverage qos-scheduler-info | It reveals solely scheduler info configured on machine. |
| present coverage qos-map-info | It reveals info of QoS mapped with interface. |
| present running-config coverage | It reveals operating configuration of all coverage configured |
Proceed Studying:
Cisco SD WAN: BFD (Bidirectional Forwarding Detection)
Cisco SD WAN: Packet Forwarding Order of Operations
