MPLS cisco QOS VPN full 02 mpls qos jayk

Create Class MapRouterconfig# class-map class1 Routerconfig-cmap# match ip precedence 5 Routerconfig-cmap# exit Routerconfig# policy-map policy1 Routerconfig-pmap# class class1 Routercon

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Jay Kumarasamy jayk@cisco.com

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• QoS Models

• Differentiated Model Features

• Modular QoS CLI (MQC)

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QoS Models

• Integrated Services (IntServ)

• Differentiated Services (Diffserv)

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The QoS Pendulum

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Integrated Model

• Application requests a specific kind of QoS service, through explicit signaling.

• Resource Reservation Protocol (RSVP) is used by applications to

signal their QoS requirements to the router.

• Complex to use.

• Difficult to support with a large number of RSVP connections, due to: the amount of state information required for every flow.

the amount of control traffic

• Fine grain, providing strict QoS.

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Differentiated Model

• Qos is provided by differential treatment to

each packet or class of packets.

• No explicit signaling from the application.

• This model is appropriate for aggregate

flows.

• Coarse grain, not strict QoS (no guarantees).

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Differentiated

IP Services

Guaranteed: Latency and Delivery

Guaranteed Delivery Voice

Silver Gold

Voice

Traffic Classification

Differentiated Model

Divide Traffic into Classes

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Switching Fabric

Scheduling policy

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Differential Model Features

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Differentiated Model Features

Classification

Most fundamental QoS building block

The component of a QoS feature that

recognizes and distinguishes between

different traffic streams

Without classification, all packets are

treated the same

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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

| Label | EXP |S| TTL |

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Policing and Shaping

• Policing is the QoS component that limits

incoming traffic flow to a configured bit

rate

• Shaping is the QoS feature component

that regulates outgoing traffic flow to a

configured bit rate

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• Random Early Detection (RED)

• Weighted Random Early Detection (WRED)

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• Weighted Fair Queuing (WFQ)

• Class Based Weighted Fair Queuing (CBWFQ)

• Low Latency Queuing (LLQ)

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Modular QoS CLI

Modular QoS CLI (MQC)

Command syntax introduced in 12.0(5)T

Reduces configuration steps and time

Uniform CLI across all main Cisco IOS-based

platforms

Uniform CLI structure for all QoS features

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router(configif)#

• 3. Attach Service Policy Associate the policy map with an input or output interface.

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• 1 Create Class Map

Router(config)# class-map class1

Router(config-cmap)# match ip precedence 5

Router(config-cmap)# exit

Router(config)# policy-map policy1

Router(config-pmap)# class class1

Router(config-pmap-c)# set mpls experimental 5

Router(config-pmap-c)# bandwidth 3000

Router(config-pmap-c)# queue-limit 30

Router(config-pmap)# exit

Router(config)# interface e1/1

Router(config-if)# service-policy output policy1

• 2 Create Policy Map

• 3 Attach Service Policy

Basic MQC Commands

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• MPLS Quality of Service

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• Note: End to end service is IP; therefore, IP

class of service is what MPLS must support

MPLS QoS

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MPLS

3) Invoke QoS Policy Action Based on EdgeClassification (based on MPLS EXP), e.g. LLQ,CBWFQ, Drop PolicyLow Priority via WRED if rate limit exceeded

1) Packet Classification

through IP Prec/DSCP

2) Match IP Prec/DSCP; Set MPLS EXP

Ratelimit/Police and apply drop policy

Core

MPLS QoS

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MPLS QoS

• ‘Differentiated Model’ approach: Set IP precedence or

MPLS Exp bit at the edge of the network

• WRED by MPLS Exp, and WFQ by class in the core

• Because MPLS is there primarily to transport IP,

MPLS’s primary QoS goal is to support existing IP

QoS models

• Because MPLS is there to support very large scale

operations, MPLS should also be capable of

supporting Diff-Serv in the future

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MPLS QoS

• Copy of IP Precedence into MPLS EXP

• Mapping of IP Precedence into MPLS EXP

Prec: xyz

IPv4 Packet MPLS Hdr

Prec: xyz

MPLS EXP: xyz

Non-MPLS Domain

MPLS Domain

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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

| Label | EXP |S| TTL |

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MPLS QoS

Diff-Serv : Jargon

• PHB = Per Hop Behavior

The Diff-Serv treatment (scheduling/dropping) applied by a Router to all the packets which are to experience the same Diff-Serv service

• DSCP = Differentiated Services Code Point

The value in the IP Header indicating which PHB is to be applied to the packet

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“Queue” inferred from Label and E XP field

“drop priority” inferred from label and EXP field

L -LSP

“Queue” inferred exclusively from L abel

“drop priority” inferred from EXP field

<draft-ietf-mpls-diff-ext-03.txt>, by

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MPLS QoS

Edge DiffServ LSR with L-LSP

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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

DSCP

Edge LSR

1) identify incoming packet’s BA looking at incoming DSCP

2) pick the LSP/label which supports the right FEC and the right BA

3) mark the EXP field to reflect the packet’s BA

DSCP

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MPLS QoS Signaling

New DIFFSERV object/TLV added to RSVP/LDP to

signal the “queue” in which to enqueue the label

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MPLS QoS

E-LSP & L-LSP Applicability

both E-LSPs and L-LSPs are applicable

only L-LSPs possible (EXP is not seen by ATM LSR)

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MPLS QoS

• On non-ATM LSRs, MPLS-QoS is simple

• Copy or Map IP precedence to MPLS exp

field

• Exact same mechanism as IP-QoS

• Net result is end-to-end QoS

indistinguishable from non-MPLS (IP)

network

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MPLS QoS

ATM Forum PVC Mode

ATM-LSR

PVC

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of classes (2-4)

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MPLS QoS

Multi VC Mode

MPLS QoS

Multi VC Mode

• Queuing is done through CBWFQ (eg

Premium gets 80% of link, standard gets

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• MPLS Class of Service

• Examples

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P 3

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! Matching voice traffic from customer 1

Pe1(config)# class-map match-all cus1_voice

Pe1(config-cmap)# match interface POS1/0

Pe1(config-cmap)# match ip precedence 4

Pe1(config-cmap)# end

! Matching any e2e traffic

Pe1(config)# class-map erp

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Pe1(config)# class-map isp_voice

Pe1(config-cmap)# match mpls experimental 4

Pe1(config)# class-map isp_erp

Pe1(config)# class-map isp_routine

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! Input Policy for setting experimental 4, 2, 1

Pe1(config)# policy-map pe1_input

Pe1(config-pmap)# class cus1_voice

Pe1(config-pmap-c)# set mpls experimental 4

Pe1(config-pmap-c)# exit

Pe1(config-pmap)# class erp

Pe1(config-pmap)# class class-default

Pe1(config-pmap)# exit

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! Output Policy for configuring bandwidth, queue…

Pe1(config)# policy-map policy pe1_output

Pe1(config-pmap)# class isp_voice

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Pe1(config)# interface POS1/0

Pe1(config-if)# service-policy input pe1_input

Pe1(config-if)# service-policy output pe1_output

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Pe1(config)# ATM1/0

Pe1(config-if)# no ip address

Pe1(config-if)# atm clock INTERNAL

Pe1(config-if)# no atm ilmi-keepalive

Pe1(config-if)# exit

Pe1(config)# interface ATM1/0.1 tag-switching

Pe1(config-if)# ip unnumbered loopback0

Pe1(config-if)# tag-switching multi-vc

Pe1(config-if)# tag-switching atm vpi 2-5

Pe1(config-if)# tag-switching ip

! Sets up 3 LVCs.

Pe1(config)# cos-map 1 ! 3 - standard

Pe1(config-mpls-cos-map)# class 3 standard ! 2 - premium

Pe1(config-mpls-cos-map)# exit ! 1 - standard

! 0 – available

Pe1(config)# mpls prefix-map 1 access-list 1 cos-map 1

Examples

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! Matching any e2e traffic

Pe1(config)# class-map erp

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P! Input Policy for setting experimental 2, 1, 0

e1(config)# policy-map pe1_input

Pe1(config-pmap-c)# set mpls experimental 2 ! Voice for customer 1

Pe1(config-pmap-c)# set mpls experimental 2 ! Voice for customer 2

Pe1(config-pmap)# class erp

Pe1(config-pmap-c)# set mpls experimental 1 ! ERP data

Pe1(config-pmap)# class class-default

Pe1(config-pmap-c)# set mpls experimental 0 ! All other traffic

Pe1(config-pmap)# exit

Pe1(config)# class-map isp_voice

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Pe1(config)# class-map isp_erp

Pe1(config)# class-map isp_available

! Output Policy for configuring bandwidth, queue…

Pe1(config)# policy-map policy pe1_output

Pe1(config-pmap)# class isp_voice

Pe1(config-pmap-c)# priority 100

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tag-switching atm vpi 2-15

tag-switching atm cos available 20

tag-switching atm cos standard 30

tag-switching atm cos premium 50

tag-switching ip

Interface XTagATM12

extended-port ATM3/0 bpx 1.2

tag-switching atm vpi 2-15

tag-switching atm cos available 20

tag-switching atm cos standard 30

tag-switching atm cos premium 50

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Thank You!

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