QoS for dVTI

Last Updated: July 11, 2012

This module provides conceptual information for using egress QoS on Dynamic Virtual Tunnel Interfaces (dVTI). QoS for dVTI allows you to configure a single dVTI tunnel template. This template is replicated to give connectivity to remote endpoints.

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Restrictions for QoS dVTI

  • With hierarchical egress policy-maps, the topmost policy may only have class-default
  • Priority, bandwidth, fair-queue may only be configured at the lowest level of a policy-map hierarchy containing queuing features
  • Bandwidth remaining percent may not be configured at the topmost level of a hierarchical policy-map
  • Only 2000 dVTI tunnels can have QoS configured
  • Output QoS may not be configured on both the dVTI tunnel template and the output physical

Information About QoS for dVTI

A single dVTI template can support numerous connections from routers with static VTI (sVTI) configuration. The dVTI template configuration is typically on a hub router. Remote spoke routers have a sVTI configuration that always points to the hub router.

QoS for dVTI supports the following:

  • Maximum of 2000 dynamic tunnels using QoS from the dVTI tunnel template
  • Scalability for an additional 2000 dynamic tunnels with no QoS on the dVTI tunnel template
  • Low latency egress queuing on dVTI tunnel templates
  • Egress shaping (with and without overhead accounting) on dVTI tunnel templates
  • QoS pre-classify on dVTI tunnel templates

Configuration Examples for QoS for dVTI

Example 2 Layer Rate LLQ for dVTI

This example shows how to configure a 2 Layer egress policy-map on the virtual tunnel interface which gives the following:

  • ToS-specific rate LLQ for certain traffic
  • Overall rate limiting on a per-tunnel basis
  • Additional overhead is considered using the account directive on the shape command in the parent shaper 
class-map match-any real_time
  match ip dscp cs5  ef
!
class-map match-any generic_data
  match ip dscp cs1 cs2 af21 af22
  match ip dscp default 
!
policy-map child
class real_time
  police cir 200000
   conform-action transmit
   exceed-action drop
   violate-action drop
  priority
class generic_data
  bandwidth remaining percent 100
!
policy-map parent
  class class-default
  shape average 1000000 account user-defined 30
  service-policy child
!
interface Virtual-Template 1 type tunnel
  service-policy output parent

Example 2 Layer Rate LLQ with Bandwidth Guarantees for dVTI

This example shows how to configure a 2 Layer egress policy-map on the virtual tunnel interface which gives the following:

  • ToS-specific rate LLQ for certain traffic
  • Bandwidth guarantees for other traffic
  • Overall rate limiting on a per-tunnel basis 
class-map match-any real_time
match ip precedence 5
!
class-map match-any higher_data_1
match ip precedence 2
!
class-map match-any higher_data_2
match ip precedence 3
!
policy-map child
  class real_time priority
    police 5000000 conform-action transmit exceed-action drop violate-action drop
  class higher_data_1
    bandwidth remaining percent 50
  class higher_data_2
    bandwidth remaining percent 40
  class class-default
    shape average 10000000
  bandwidth remaining percent 5
!
policy-map parent
  class class-default shape average 15000000
  service-policy child
!
interface Virtual-Template 1 type tunnel
service-policy output parent

Example 3 Layer QoS for dVTI

policy-map parent
  Class class-default
      Shape average 50000000
      Bandwidth remaining ratio 1
      Service-policy child
!
policy-map child
    Class Red
      Shape average percent 80
      Bandwidth remaining ratio 9
      Service-policy grandchild
    Class Green
      Shape average percent 80
      Bandwidth remaining ratio 2
      Service-policy grandchild
!
policy-map grandchild
  Class voice
    Priority level 1
  Class video
    Priority level 2
  Class data_gold
    Bandwidth remaining ratio 100
  Class class-default
    Random-detect dscp-based
!
 
interface virtual-template101 type tunnel
ip unnumbered looback101
tunnel source GigabitEthernet0/3/0
service-policy output parent

Additional References

Related Documents

Related Topic Document Title

Cisco IOS commands

Cisco IOS Master Commands List, All Releases

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Standard/RFC Title

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

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Feature Information for QoS for dVTI

Property Type Property Value Property Description

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