Port-Level Shaping and Minimum Bandwidth Guarantee

Hierarchical QoS (HQoS) redirects traffic from the service-group layer to another queue where shaping is applied. Port-level shaping occurs when traffic is directed to the default queue of the CLASS_LAYER. This CLASS_LAYER is built on top of the port.

When HQoS queueing policies are applied to service groups, an HQoS SG default queueing node is created at the service-group level for all traffic going through the HQoS service groups.

The port default node is used for:

• All traffic from EVCs and subinterfaces that are not part of a service group
• EVCs and subinterfaces that are part of service groups but do not have QoS

Port-level shaping shapes at the port level in the egress direction. You can limit per-port bandwidth in coexistence with four-level scheduling on the following:

• Service groups
• EVCs
• Subinterfaces
• ISG sessions

Port-level policy is attached to a port before service group or EVC policies are attached on that port.

You can configure the minimum bandwidth guarantee at the service-group level. This does the following:

• Allows bandwidth guarantees during times of traffic congestion
• Sets the remaining bandwidth for classes without a scheduler at the top level; this bandwidth is used as a parent scheduler reference for lower-level schedulers
• Allows you to implicitly configure default service group node bandwidth

SUMMARY STEPS

1.    enable

2.    configure terminal

3.    interface type slot/port

4.    policy-map policy-map-name

5.    class class-default

6.    shape {average | peak} cir [ bc ] [ be ]

7.    interface type slot/port

8.    service-policy {input | output} policy-map-name

9.    end

DETAILED STEPS

	Command or Action	Purpose
Step 1	enable Example: Router> enable	Enables privileged EXEC mode. Enter your password if prompted.
Step 2	configure terminal Example: Router# configure terminal	Enters global configuration mode.
Step 3	interface type slot/port Example: Router(config)# interface gigabitethernet 9/5	Configures an interface type and enters interface configuration mode.
Step 4	policy-map policy-map-name Example: Router(config-if)# policy-map abc	Creates a policy map and enters policy-map configuration mode
Step 5	class class-default Example: Router(config-pmap)# class class-default	Creates a traffic class nd enters policy-map class configuration mode.
Step 6	shape {average | peak} cir [ bc ] [ be ] Example: Router(config-pmap-c)# shape average cir 256000	Specifies average or peak rate traffic shaping.
Step 7	interface type slot/port Example: Router(config-pmap-c)# interface gigabitethernet 9/5	Configures an interface type and enters interface configuration mode.
Step 8	service-policy {input | output} policy-map-name Example: Router(config-pmap-c)# service-policy output abc	Attaches a policy map to a control plane for aggregate or distributed control plane services.
Step 9	end Example: Router(config-pmap-c)# end	Exits policy-map class configuration mode and returns to privileged EXEC mode.

SUMMARY STEPS

1.    enable

2.    configure terminal

3.    service-group service-group-identifier

4.    service-policy {input | output} policy-map-name

5.    interface type slot/port

6.    group service-group-identifier

7.    end

DETAILED STEPS

	Command or Action	Purpose
Step 1	enable Example: Router> enable	Enables privileged EXEC mode. Enter your password if prompted.
Step 2	configure terminal Example: Router# configure terminal	Enters global configuration mode.
Step 3	service-group service-group-identifier Example: Router(config)# service-group 1	Creates a service group
Step 4	service-policy {input | output} policy-map-name Example: Router(config-service-group)# service-policy output abc	Attaches a policy map to a control plane for aggregate or distributed control plane services.
Step 5	interface type slot/port Example: Router(config-service-group)# interface gigabitethernet 9/5	Configures an interface type and enters interface configuration mode.
Step 6	group service-group-identifier Example: Router(config-if)# group 1	Adds a member to a service group.
Step 7	end Example: Router(config)# end	Exits interface configuration mode and returns to privileged EXEC mode.

SUMMARY STEPS

1.    enable

2.    configure terminal

3.    show policy-map interface type number service group service-group-identifier

4.    show policy-map interface number service instance number

DETAILED STEPS

	Command or Action	Purpose
Step 1	enable Example: Router> enable	Enables privileged EXEC mode. Enter your password if prompted.
Step 2	configure terminal Example: Router# configure terminal	Enters global configuration mode.
Step 3	show policy-map interface type number service group service-group-identifier Example: Router# show policy-map interface gigabitEthernet 9/5 service group 1	Displays the policy-map information for service groups that have members attached to an interface.
Step 4	show policy-map interface number service instance number Example: Router# show policy-map interface port-channel 1 service instance 1	Displays the policy-map information for a given service instance under a port channel.