[Contents] [Prev] [Next] [Index] [Report an Error] [No Frames]

JUNOSe 9.0.x Quality of Service Configuration Guide > Configuring Simple Shared Shaping of Traffic > Simple Shared Shaping Configuration Examples

Simple Shared Shaping Configuration Examples

This section explains how to configure the shared shaper by specifying a shared-shaping rate for either the best-effort queue or the best-effort scheduler node for the logical interface. The router locates the other queues associated with the logical interface and shapes that set of queues to the shared rate.

VC Simple Shared Shaping Example

The following commands configure a simple shared shaper for a VC, as shown in Figure 18. In this example, the best-effort queue for logical interface VC 3 is shaped to a shared rate of 1 Mbps. The voice and video queues for VC 3 share the 1 Mbps with the best-effort traffic. The voice queue has first claim on the shared 1 Mbps, but only up to its individual shaping rate of 200 Kbps. The video queue claims up to the next 300 Kbps. The best-effort queue obtains whatever bandwidth remains of the 1 Mbps after the voice and video traffic have made their claims.

  1. Configure the traffic classes and traffic-class groups. 
    2. (config)#traffic-class voice

    (config-traffic-class)#fabric-strict-priority

    (config-traffic-class)#exit

    (config)#traffic-class video

    (config-traffic-class)#exit

    

    (config)#traffic-class-group EF auto-strict-priority

    (config-traffic-class-group)#traffic-class voice 

    (config-traffic-class-group)#exit

    ((config)#traffic-class-group AF extended 

    (config-traffic-class-group)#traffic-class video 

    (config-traffic-class-group)#exit
  2. Configure the shared shaper. 
    3. (config)#scheduler-profile 200kbps

    (config-scheduler-profile)#shaping-rate 200000

    (config-scheduler-profile)#exit

    (config)#scheduler-profile 300kbps

    (config-scheduler-profile)#shaping-rate 300000

    (config-scheduler-profile)#exit

    (config)#scheduler-profile shared-1mbps

    (config-scheduler-profile)#shared-shaping-rate 1000000 simple

    (config-scheduler-profile)#exit

    

    (config)#qos-profile subscriber-default-mode

    (config-qos-profile)#atm-vc node

    (config-qos-profile)#atm-vc node group AF

    (config-qos-profile)#atm-vc node group EF

    (config-qos-profile)#atm-vc queue traffic-class best-effort scheduler-profile 
shared-1mbps

    (config-qos-profile)#atm-vc queue traffic-class video scheduler-profile 300kbps

    (config-qos-profile)#atm-vc queue traffic-class voice scheduler-profile 200kbps

    (config-qos-profile)#exit
  3. Delete the rule in the default port type profile that creates IP best-effort queues by default. 
    4. config)#qos-profile atm-default

    (config-qos-profile)#no ip queue traffic-class best-effort 

    (config-qos-profile)#exit
  4. Attach the profile to the ATM subinterface for VC 3.
    5. (config)#interface atm 11/0.10 

    (config-subif)#qos-profile subscriber-default-mode 

    (config-scheduler-profile)#exit

The qos-profile subscriber-default-mode command shown in this example is appropriate if you have configured the SAR to be in default mode (by issuing the no qos-mode-port command). If this QoS profile is attached in low-CDV mode, the shaper is effective but the CDV is not correctly bounded, because the VC is not reshaped in the SAR.

The following commands configure a QoS profile different from the one shown in the previous example. In this example, the best-effort scheduler node for VC 3 is shaped to a shared rate of 1 Mbps. The qos-profile subscriber-low-cdv-mode command is appropriate if you configure the SAR in low-CDV mode (by issuing the qos-mode-port low-cdv command). The VC is reshaped to 1 Mbps in the SAR. If this QoS profile is attached in the SAR default mode, the 1-Mbps shaper is disabled by VC backpressure from the SAR.

(config)#qos-profile subscriber-low-cdv-mode

(config-qos-profile)#atm-vc node scheduler-profile shared-1mbps

(config-qos-profile)#atm-vc node group AF

(config-qos-profile)#atm-vc node group EF

(config-qos-profile)#atm-vc queue traffic-class best-effort 

(config-qos-profile)#atm-vc queue traffic-class video scheduler-profile 300kbps

(config-qos-profile)#atm-vc queue traffic-class voice scheduler-profile 200kbps

(config-qos-profile)#exit

VP Simple Shared Shaping Example

In the example shown in Figure 20, VP 1 is shaped to a shared rate of 5 Mbps. The shared shaper requires that voice and video traffic be carried in queues associated with the logical interface, which in this scenario is the VP. VP-level queuing does not guarantee fairness to the voice and video traffic for each VC, but fairness is not a major issue because admission control guarantees that the voice and video queues do not become congested.

This example assumes the same traffic class and traffic-class group configurations that are used in VC Simple Shared Shaping Example.


Figure 20: VP Shared Shaping

The following set of commands configures the shared shaper in Figure 20.

(config)#scheduler-profile 2mbps

(config-scheduler-profile)#shaping-rate 2000000

(config-scheduler-profile)#exit

(config)#scheduler-profile 400kbps

(config-scheduler-profile)#shaping-rate 400000

(config-scheduler-profile)#exit

(config)#scheduler-profile shared-5mbps

(config-scheduler-profile)#shared-shaping-rate 5000000 simple

(config-scheduler-profile)#exit



(config)#qos-profile vp-subscriber1

(config-qos-profile)#atm-vp node scheduler-profile shared-5mbps

(config-qos-profile)#atm-vp node group AF

(config-qos-profile)#atm-vp node group EF

(config-qos-profile)#atm-vc node

(config-qos-profile)#atm-vc queue traffic-class best-effort scheduler-profile default

(config-qos-profile)#atm-vp queue traffic-class video scheduler-profile 2mbps

(config-qos-profile)#atm-vp queue traffic-class voice scheduler-profile 400kbps

(config-qos-profile)#exit

In this example, the best-effort scheduler node for the VP is shaped to a shared rate of 5 Mbps. The EF and AF queues for the VP share the 5 Mbps with the best-effort traffic. The EF queue has first claim on the shared 5 Mbps, but only up to its individual shaping rate of 400 Kbps. The AF queue claims up to the next 2 Mbps. The VC-level best-effort queues obtain whatever bandwidth remains of the 5 Mbps after the AF traffic and EF traffic have made their claims. This QoS profile is appropriate for low-CDV mode. If the provider configures a shapeless VP tunnel in the SAR, QoS sets the SAR shaper for the VP to match the 5-Mbps shared-shaping rate, and the CDV is bounded for the VP tunnel.

Ethernet Simple Shared Shaping Example

In a typical triple-play network configuration over Ethernet, individual subscribers are represented on the B-RAS by VLANs and DSLAMs by SVLANs. In this example, the provider shapes the subscriber aggregate of voice, video, and data to a single rate.

In this example, S-VLAN 0 has traffic in three traffic-class groups: the default group, the TC1 traffic class in the G1 group, and the TC2 traffic class in the G2 traffic-class group.


Figure 21: Hierarchical Simple Shared Shaping over Ethernet

In Figure 21, the S-VLANs labeled 1, 2, and 3 indicate the possible constituents for S-VLAN 0. The active constituents for the simple shared shaper are the three nodes for S-VLAN 0 in the three traffic-class groups.

NOTE: This example uses QoS parameters to configure shared shaping.


  1. Configure the traffic classes and traffic-class groups.
    2. (config)#traffic-class tc1

    (config)#exit

    (config)#traffic-class tc2

    (config)#exit

    (config)#traffic-class-group g1

    (config-traffic-class-group)#traffic-class tc1

    (config-traffic-class-group)#exit

    (config)#traffic-class-group g2 extended

    (config-traffic-class-group)#traffic-class tc2

    (config-traffic-class-group)#exit
  2. Configure the parameter definitions.
    3. (config)#qos-parameter-define vlan-g1-max-rate

    (qos-parameter-define)#controlled-interface-type vlan

    (qos-parameter-define)#instance-interface-type vlan

    (qos-parameter-define)#exit

    

    (config)#qos-parameter-define svlan-g1-max-rate

    (qos-parameter-define)#controlled-interface-type svlan

    (qos-parameter-define)#instance-interface-type svlan

    (qos-parameter-define)#instance-interface-type ethernet

    (qos-parameter-define)#exit

    

    (config)#qos-parameter-define vlan-max-rate

    (qos-parameter-define)#controlled-interface-type vlan

    (qos-parameter-define)#instance-interface-type vlan

    (qos-parameter-define)#instance-interface-type svlan

    (qos-parameter-define)#exit

    

    (config)#qos-parameter-define svlan-max-rate

    (qos-parameter-define)#controlled-interface-type svlan

    (qos-parameter-define)#instance-interface-type svlan

    (qos-parameter-define)#instance-interface-type ethernet

    (qos-parameter-define)#exit
  3. Configure the shared shaper by referencing parameter definitions in the shaping-rate command.
    4. (config)#scheduler-profile vlan-be

    (config-scheduler-profile)#shared-shaping-rate vlan-max-rate simple

    (config-scheduler-profile)#exit

    (config)#scheduler-profile svlan-be

    (config-scheduler-profile)# shared-shaping-rate svlan-max-rate simple

    (config-scheduler-profile)#exit

    

    (config)#scheduler-profile svlan-g1

    (config-scheduler-profile)#shaping-rate svlan-g1-max-rate

    (config-scheduler-profile)#exit

    (config)#scheduler-profile vlan-g1

    (config-scheduler-profile)#shaping-rate vlan-g1-max-rate

    (config-scheduler-profile)#exit

    (config)#scheduler-profile svlan-g2

    (config-scheduler-profile)#shaping-rate svlan-max-rate % 50

    (config-scheduler-profile)#exit
  4. Configure the QoS profile.
    5. (config)#qos-profile svlan-4.1

    (config-qos-profile)#vlan queue traffic-class best-effort

    (config-qos-profile)#vlan node scheduler-profile vlan-be

    (config-qos-profile)#svlan node scheduler-profile svlan-be

    (config-qos-profile)#vlan queue traffic-class tc1

    (config-qos-profile)#svlan node scheduler-profile svlan-g1 group g1

    (config-qos-profile)#svlan queue traffic-class tc2

    (config-qos-profile)#svlan node scheduler-profile svlan-g2 group g2

    (config-qos-profile)#ethernet group g2 scheduler-profile default
  5. Attach the QoS profile to the S-VLANs on Fast Ethernet interface 11/0.
    6. (config)#interface fastEthernet 11/0

    (config-if)#svlan 0 qos-parameter svlan-max-rate 4000000

    (config-if)#svlan 0 qos-profile svlan-4.1

    (config-if)#encapsulation vlan

    (config-if)#exit

    

    (config)#interface fastEthernet 11/0.1

    (config-if)#svlan id 0 1

    (config-if)#ip address 1.2.1.1 255.255.255.0

    (config-if)#exit

    

    (config)#interface fastEthernet 11/0.2

    (config-if)#svlan id 0 2

    (config-if)#ip address 1.3.1.1 255.255.255.0

    (config-if)#exit

Related Topics

[Contents] [Prev] [Next] [Index] [Report an Error] [No Frames]