Port-Shaper and LLQ in the Presence of EFPs

The Port-Shaper and LLQ in the Presence of EFPs feature allows network designers to configure port and class policies on ports that contain Ethernet Flow Points (EFPs). These policies support Low Latency Queueing (LLQ) and traffic prioritization across the EFPs.

Restrictions for Port-Shaper and LLQ in the Presence of EFPs

  • If you configure port level shaper with the policy applied at EFP level, then port shaper does not work. However, 3 level HQoS policy with port and logical shaper can be applied at the EFP level. Logical shaper that is configured at logical level does work but port shaper does not work.

  • If you configure a class-based policy on the port, then you cannot configure service-policies on Ethernet Flow Points (EFPs).

  • Attaching a service policy to the BDI is not supported.

  • ACL based shaping policy-map cannot be applied to the EFP and/or egress interface.

  • Usage of bandwidth remaining percentage (BRP) in the absence of priority class, allocates the available bandwidth in an iterative way. For example, the bandwidth is allocated for the first BRP class as per the percentage of share that is configured in the respective class-map and the remaining bandwidth is iteratively allocated to all other BRP classes until the bandwidth is exhausted.

Information About Port-Shaper and LLQ in the Presence of EFPs

Ethernet Flow Points and LLQ

An Ethernet Flow Point (EFP) is a forwarding decision point in the provider edge (PE) router, which gives network designers flexibility to make many Layer 2 flow decisions within the interface. Many EFPs can be configured on a single physical port. (The number varies from one device to another.) EFPs are the logical demarcation points of an Ethernet virtual connection (EVC) on an interface. An EVC that uses two or more User-Network Interfaces (UNIs) requires an EFP on the associated ingress and egress interfaces of every device that the EVC passes through.

The Egress HQoS with Port Level Shaping feature allows network designers to configure port and class policies on ports that contain EFPs. These policies support Low Latency Queueing (LLQ) and traffic prioritization across the EFPs.

For information on how to configure LLQ, see the QoS Congestion Management Configuration Guide.

How to Configure Port-Shaper and LLQ in the Presence of EFPs

To configure the Port-Shaper and LLQ in the Presence of EFPs feature, you first create either a hierarchical or flat policy map that supports Low Latency Queueing (LLQ), which you then attach to an EFP interface.

Configuring Hierarchical Policy Maps

To configure hierarchical policy maps, you create child policies which you then attach to a parent policy. The parent policy is then attached to an interface.

Procedure

Step 1

enable

Example:


Device> enable

Enables privileged EXEC mode.

  • Enter your password if prompted.

Step 2

configure terminal

Example:


Device# configure terminal

Enters global configuration mode.

Step 3

policy-map policy-map-name

Example:


Device(config)# policy-map child-llq

Creates or modifies the child policy and enters QoS policy-map configuration mode.

  • child-llq is the name of the child policy map.

Step 4

class class-map-name

Example:


Device(config-pmap)# class precedenc-1

Assigns the traffic class you specify to the policy map and enters QoS policy-map class configuration mode.

  • precedenc-1 is the name of a previously configured class map and is the traffic class for which you want to define QoS actions.

Step 5

set cos value

Example:


Device(config-pmap-c)# set cos 5

(Optional) Sets the Layer 2 class of service (CoS) value of an outgoing packet.

  • The value is a specific IEEE 802.1Q CoS value from 0 to 7.

Step 6

bandwidth percent percent

Example:


Device(config-pmap-c)# bandwidth percent 20

(Optional) Specifies a bandwidth percent for class-level queues to be used during congestion to determine the amount of excess bandwidth (unused by priority traffic) to allocate to nonpriority queues.

Step 7

exit

Example:


Device(config-pmap-c)# exit

Exits QoS policy-map class configuration mode.

Step 8

class class-map-name

Example:


Device(config-pmap)# class precedenc-2

Assigns the traffic class you specify to the policy map and enters QoS policy-map class configuration mode.

  • precedenc-2 is the name of a previously configured class map and is the traffic class for which you want to define QoS actions.

Note 

match on qos-group is supported on the Cisco RSP3 Module.

Step 9

bandwidth percent percent

Example:


Device(config-pmap-c)# bandwidth percent 80

(Optional) Specifies a bandwidth percent for class-level queues to be used during congestion to determine the amount of excess bandwidth (unused by priority traffic) to allocate to nonpriority queues.

Step 10

exit

Example:


Device(config-pmap-c)# exit

Exits QoS policy-map class configuration mode.

Step 11

policy-map policy-map-name

Example:


Device(config-pmap)# policy-map parent-llq

Creates or modifies the parent policy.

  • parent-llq is the name of the parent policy map.

Step 12

class class-default

Example:


Device(config-pmap)# class class-default

Configures or modifies the parent class-default class and enters QoS policy-map class configuration mode.

  • You can configure only the class-default class in a parent policy. Do not configure any other traffic class.

Step 13

service-policy policy-map-name

Example:


Device(config-pmap-c)# service-policy child-llq

Applies the child policy to the parent class-default class.

  • child-llq is the name of the child policy map configured in step 1.

Configuring an LLQ Policy Map

Procedure

Step 1

enable

Example:


Device> enable

Enables privileged EXEC mode.

  • Enter your password if prompted.

Step 2

configure terminal

Example:


Device# configure terminal

Enters global configuration mode.

Step 3

policy-map policy-map-name

Example:


Device(config)# policy-map llq-flat

Creates a policy and enters QoS policy-map configuration mode.

Step 4

class class-map-name

Example:


Device(config-pmap)# class dscp-af1

Assigns the traffic class you specify to the policy map and enters policy-map class configuration mode.

Step 5

priority

Example:


Device(config-pmap-c)# priority

Configures LLQ, providing strict priority queueing (PQ) for class-based weighted fair queueing (CBWFQ).

Step 6

exit

Example:


Device(config-pmap-c)# exit

Exits QoS policy-map class configuration mode.

Step 7

class class-map-name

Example:


Device(config-pmap)# class dscp-af2

Assigns the traffic class you specify to the policy map and enters QoS policy-map class configuration mode.

Step 8

shape average value

Example:


Device(config-pmap-c)# shape average 200000000

Configures a shape entity with a Comitted Information Rate of 200 Mb/s.

Step 9

exit

Example:


Device(config-pmap-c)# exit

Exits QoS policy-map class configuration mode.

Step 10

class class-map-name

Example:


Device(config-pmap)# class dscp-af3

Assigns the traffic class you specify to the policy map and enters QoS policy-map class configuration mode.

Step 11

bandwidth percent

Example:


Device(config-pmap-c)# bandwidth 4000000

(Optional) Specifies a bandwidth percent for class-level queues to be used during congestion to determine the amount of excess bandwidth (unused by priority traffic) to allocate to non-priority queues.

Step 12

exit

Example:


Device(config-pmap-c)# exit

Exits QoS policy-map class configuration mode.

Configuring Port Level Shaping on the Main Interface with Ethernet Flow Points

To configure port level shaping on the main interface with EFPS, first you enable the autonegotiation protocol on the interface, then you attach a policy map to the interface and finally you configure the Ethernet service instance.

Procedure

Step 1

enable

Example:


Device> enable

Enables privileged EXEC mode.

  • Enter your password if prompted.

Step 2

configure terminal

Example:


Device# configure terminal

Enters global configuration mode.

Step 3

interface type number

Example:


Device(config)# interface GigabitEthernet 0/0/1

Configures an interface type and enters interface configuration mode.

  • Enter the interface type number.

Step 4

no ip address

Example:


Device(config-if)# no ip address

Disables IP routing on the interface.

Step 5

negotiation auto

Example:


Device(config-if)# negotiation auto

Enables the autonegotiation protocol to configure the speed, duplex, and automatic flow control of the Gigabit Ethernet interface.

Step 6

service-policy output policy-map-name

Example:


Device(config-if)# service-policy output parent-llq

Specifies the name of the policy map to be attached to the input or output direction of the interface.

  • You can enter the name of a hierarchical or a flat policy map.

Step 7

service instance id ethernet

Example:


Device(config-if)# service instance 1 ethernet

Configures an Ethernet service instance on an interface and enters service instance configuration mode.

Step 8

encapsulation dot1q vlan-id

Example:


Device(config-if-srv)# encapsulation dot1q 100

Defines the matching criteria to map 802.1Q frames' ingress on an interface to the service instance.

Step 9

bridge-domain bridge-domain-id

Example:


Device(config-if-srv)# bridge-domain 100

Binds the bridge domain to the service instance.

Step 10

exit

Example:


Device(config-if-serv)# exit

Exits service instance configuration mode.

Step 11

service instance id ethernet

Example:


Device(config-if)# service instance 2 ethernet

Configures an Ethernet service instance on an interface and enters service instance configuration mode.

Step 12

encapsulation dot1q vlan-id

Example:


Device(config-if-srv)# encapsulation dot1q 101

Defines the matching criteria to map 802.1Q frames' ingress on an interface to the service instance.

Step 13

bridge-domain bridge-domain-id

Example:


Device(config-if-srv)# bridge-domain 101

Binds the bridge domain to the service instance.

Step 14

exit

Example:


Device(config-if-srv)# exit

Exits QoS policy-map class configuration mode.

Step 15

end

Example:


Device(config-if)# end

(Optional) Exits interface configuration mode.

Configuration Examples for Port-Shaper and LLQ in the Presence of EFPs

Example: Configuring Hierarchical QoS Port Level Shaping on the Main Interface with EFPs

The following example shows how to configure hierarchical QoS port level shaping on a main physical interface to support traffic prioritization and Low Level Queueing across all EFPs configured on the interface: 


policy-map parent-llq
 class class-default
   service-policy child-llq
 
policy-map child-llq
 class precedenc-1
  set cos 5
  bandwidth percent 20
 class precedenc-2
  bandwidth percent 80

interface GigabitEthernet 0/0/1
 no ip address
 negotiation auto
 service-policy output parent-llq
 service instance 1 ethernet
  encapsulation dot1q 100
  bridge-domain 100
 !
 service instance 2 ethernet
  encapsulation dot1q 101
  bridge-domain 101

Note
Only match EFP and match qos-group is supported on RSP3 in egress policy map.

Example: Configuring Port Level Shaping on the Main Interface with EFPs

The following example shows how to configure port level shaping on a main physical interface to support traffic prioritization and Low Level Queueing across all Ethernet Flow Points (EFPs) configured on the interface: 

policy-map llq_flat 
 class dscp-af1
  priority 
  class dscp-af2
   shape average 200000000
  class dscp-af3
   bandwidth 400000 

interface GigabitEthernet 0/0/1
 no ip address
 negotiation auto
 service-policy output llq_flat
 service instance 1 ethernet
  encapsulation dot1q 100
  bridge-domain 100
 !
 service instance 2 ethernet
  encapsulation dot1q 101
  bridge-domain 101

Additional References

Related Documents

Related Topic

Document Title

Cisco IOS commands

Cisco IOS Master Commands List, All Releases

QoS commands: complete command syntax, command modes, command history, defaults, usage guidelines, and examples

Cisco IOS QoS Command Reference

Policing and shaping

"Policing and Shaping Overview" module

Class maps

"Applying QoS Features Using the MQC" module

Policy maps

"Applying QoS Features Using the MQC" module

Low Latency Queueing

QoS Congestion Management Configuration Guide

Standards and RFCs

Standard

Title

No new or modified standards are supported, and support for existing standards has not been modified.

--

MIBs

MIB

MIBs Link

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To locate and download MIBs for selected platforms, Cisco IOS XE software releases, and feature sets, use Cisco MIB Locator found at the following URL:

http://www.cisco.com/go/mibs

Technical Assistance

Description

Link

The Cisco Support and Documentation website provides online resources to download documentation, software, and tools. Use these resources to install and configure the software and to troubleshoot and resolve technical issues with Cisco products and technologies. Access to most tools on the Cisco Support and Documentation website requires a Cisco.com user ID and password.

http://www.cisco.com/cisco/web/support/index.html