Medianet: An Architectural Approach for Optimal Video ... · MSP provides a subset of Medianet...

© 2011 Cisco and/or its affiliates. All rights reserved. Cisco Connect 1 1 © 2012 Cisco and/or its affiliates. All rights reserved.

Medianet: An Architectural Approach for Optimal Video Collaboration

Jianzhu Zhang Technical Marketing Engineer

March 6th, 2013

Hong Kong, China

March 6, 2013

© 2012 Cisco and/or its affiliates. All rights reserved. Cisco Connect 2

What is Video Collaboration?

Video IP Telephony

CP-9971

IP Video Phone E20

EX90

MXP1700

Telepresence

1xxx,3xxx Series

T Series

Soft Clients

Jabber

Desktop/ Room Video Conferencing

Web Conferencing

WebEx


Video Is Not Voice

• Traffic profile is very different

• Variable Bit Rate

• More data on the wire

32 to 209

times

the

bandwidth


Problems to solve for a successful video deployment

Network

Management

Optimization

Pre-assessment

Check if network is ready for video deployment

Identify and eliminate potential issues

Classification

Traffic flow/application recognition and enforcement

Ensure QoS control reflects established business policies & priorities

Monitoring &

Instrumentation Visibility into network and application

behavior

Response time measurements

Centralized monitoring & reporting

Troubleshooting

• Reduce application latency

Select the optimal path


Cisco’s Medianet Architecture

Smarter Endpoints

Smarter Network

Medianet technology embedded Medianet technology embedded

Agenda

• Media Awareness

• Performance Monitor

• Mediatrace

• Pre-deployment Assessment

© 2012 Cisco and/or its affiliates. All rights reserved. Cisco Connect 7 © 2011 Cisco and/or its affiliates. All rights reserved. Cisco Connect 7 7 © 2012 Cisco and/or its affiliates. All rights reserved.

Media Awareness


Defining Media Awareness

‘Media Awareness’ is…

A collection of techniques to detect different

types of endpoints, media and application

types (TelePresence, video surveillance,

desktop collaboration and streaming media)

in order to deliver the best experience.

Why Media Awareness?

Example Policies Example Use Cases

QoS

Monitoring

Routing

Security

• Prioritize Voice & Video

• Protect Business Critical Applications

• Troubleshooting

• SLA

• Avoid Bandwidth upgrade by leverage the backup path

• Protect Business Critical Applications

• Access Control

• Firewall traversal

Media Awareness Methods

How? Mechanisms Technologies

Endpoint/Application directly

tells the network what type of

applications

Explicit – Endpoint/Application signals to

the network

Media Metadata

Network figures it out Implicit – Deep Packet Inspection

(control signaling protocols for the

establishment of sessions, packet

headers and payload)

Network Based Application Recognition

(NBAR/NBAR2)

Media Services Proxy (MSP)

Network administrator

configures the network

Static configuration ACLs

MetadataHere

• Metadata describes the device/application that sends the media flow

Application name, vendor, version, model, etc

• Metadata describes the media flow

Media type: voice/video/data

Transport type: RTP/RTCP/…

…

• Preferably generated by endpoint

• Generated by network devices if necessary

• Carried by RSVP (Cisco extension)


Media Awareness With Flow Metadata Jabber Announces Metadata Attributes to the Network

12

Jabber explicitly signals Metadata Attributes to Network

Flow Metadata Producer

Network use metadata to make smart decisions

Metadata Consumer

RSVP propagates Flow identifier and Metadata along media path.

Metadata Protocol

IP Src IP Dst Prot L4 Src L4 Dst App Name App

Vendor

App Ver Endpoint

Model

Device Class

10.1.4.20 10.1.5.20 TCP 30244 27924 Cisco-phone Cisco 9.1.0 Jabber for

Windows

Software-

phone

Flow Identifier Metadata


Flow Metadata Producer

1

3

• MSI for Windows

MSI Embedded with

Webex Installation

wmsi.dll is responsible for originating RSVP

message for propagating Metadata traffic.

Media Services Interface Resides in WebEx Client App

API – Windows, Linux, MacOS, Android

Host Stack/Service Protocols

MSI on Endpoints

• Embedded Applications (EX, C Series, CTS)

Included in application SW install


Enable Metadata

1

5

•Enable metadata flow globally, or per interface

RSVP snooping required on L2 switch

RSVP

RSVP

Internet

BR1(config)#metadata

flow

HqR2(config)#interface g0/1

HqR2(config-interface)#metadata flow

RSVP


Metadata Based Classifications

• match application telepresence-media

• match application rtp

• match application cisco-phone

Application Identifier

• match application attribute device-class room-conferencing

• match application attribute device-class surveillance

• match application attribute media-type video

Dynamic Attribute

• match application application-group webex-group

• match application application-group citrix-group

Application Group

• match application attribute category voice-and-video

• match application attribute category business-and-productivity-tools

Category

Enable performance monitoring on

all Telepresence

flows

Attribute - Application name

Attribute value - Telepresence-media

Use Case : Enable performance-monitoring for all “telepresence” flows

Set all Surveillance

flows on DSCP CS4

Attribute – device-class

Attribute value - room-conferencing

Use Case : Set up DSCP uniformly for all room conferencing device

Police all video

traffic to a particular peak rate

value

Attribute – media-type

Attribute value - video

Use Case : Police all Video Traffic to 2 Mbps


QoS Policy Using Flow Metadata Marking Traffic at Access Switch and WAN Edge

20

• The OS may not allow an application to mark the DSCP value

• The DSCP may be overwritten when traversing the SP network

Class-map match-all jabber

match application cisco-phone

Policy-map marking

Class jabber

set dscp EF

Trust incoming DSCP

Metadata

Trust incoming DSCP

Class-map match-all jabber

match application cisco-phone

Policy-map marking

Class jabber

set dscp EF

• Class-map match-all Jabber

• Match access-group 110

• Class-map match-any Jabber

• Match application cisco-phone

• Match access-group 110

Class-map Migration for Existing QoS Policy

2

1

Class-map: Jabber (match-any)

100198 packets, 10599254 bytes

30 second offered rate 75000 bps

Match: application cisco-phone


30 second rate 75000 bps

Match: access-group 110


30 second rate 0 bps

• Policy-map QoS-Policy

• Class RTP

Policy-map Migration for Existing QoS Policy

2

2

Class Jabber Class-map Jabber

Match application cisco-phone

Service-policy input: QoS-Policy

Class-map: Jabber (match-all)



Match: application cisco-phone

Class-map: RTP (match-all)

0 packets, 0 bytes


Match: ip rtp 20000 16383


Flow Metadata Deployment Consideration Firewall ACL Rules for Flow Metadata

23

• RSVP Protocol 46 must be allowed

Access Control List for

Flow Metadata

• Permit RSVP message to pass

Internet

RSVP

ip access-list extended rsvp-

permit

permit 46 any any


Flow Metadata Deployment Consideration How to traverse 3rd party devices that drop RSVP-TP message

24

• Sometimes 3rd party device erroneously drop RSVP-TP message

• Workaround: RSVP over UDP

ip rsvp udp neighbour

<next_hop>

3rd party device

dropping RSVP-TP

Metadata


Deep Packet Inspection with NBAR

Identify IP flows for Quality of Service or filtering Policies

Five Tuple + DSCP + AppID

NBAR Support for Telepresence and Webex

Cisco TelePresence media and signaling supported in IOS 15.1(3)T

WebEx desktop-share/audio/video supported in 15.2(2)T

NBAR Support for Metadata

NBAR Export Metadata in 15.2(4)M1

2

5


Integrating NBAR with Metadata

Metadata

Class-map match-all App

Match application telepresence-media

Metadata flow send

No MSI


Media Services Proxy (MSP)

Would work with non-Cisco end points also as long as they support the prescribed list of supported protocols for device and flow identification

Position at user edge (access) & resource edge (Internet/enterprise edge)

MSP

Identification

MSP provides a subset of Medianet services on behalf of media end points supporting a range of standard protocols

H323/ RAS

CDP

SIP/SDP

RTSP

Netflow

RSVP

Flow Metadata

QoS/C3PL

mDNS

Services

MSP is a network-based solution where the switches and routers automatically identify end points and applications, flows coming from them

and provide the right set of network services to them automatically


Integrating MSP with Metadata

Metadata

profile flow

media-proxy services profile PLY

metadata

media-proxy services PLY

metadata flow

No MSI

SIP

Compare and Contrast

Capabilities MSI MSP NBAR Consideration

Identify the flow and apply

the appropriate policies

(e.g. QoS, monitoring,

routing, etc.)

Signaling recognized by MSP is limited (RTSP,

SDP, SIP, H.225, H.245).

Metadata support

MSI is most flexible; MSP will retrieve information

from limited protocols; Metadata attributes setup

by NBAR is very limited, app support limited.

Works with application

traffic encryption

Resource reservation

MSP can use RSVP to make BW reservation on

behalf of endpoints

3rd Party support


Enhancing Network Visibility Using Performance Monitor


Performance Monitor Traffic Flow Discovery and Analysis

31

• Network device discovers traffic flow for performance analysis

• System operator defines metrics to gauge performance (yes, similar to flexible netflow but more video specific)

• Per-Device Hop metric collection for RTP and TCP traffic

RTP performance metrics; (Pkt-Rate, Jitter, Loss)

TCP performance metrics; (Media Pkt-Rate, Round-Trip-Time)

• Proactive monitoring for voice and video quality of service


Where to Apply Performance Monitor Perf-Mon policy applied with modular QoS configuration

32

10.87.93.45

Telepresence 10.87.93.250

Telepresence

interface GigabitEthernet0/1

service-policy type performance-monitor input pm-policy

service-policy type performance-monitor output pm-policy


CPL - Performance Monitor

3

3

WAN

10.87.93.45


Telepresence class-map match-all telepresence

match dscp cs4

match access-group ipv4

!

ip access-list extended ipv4

permit host 10.87.93.45 host 10.87.93.250

!

policy-map type performance-monitor pm-policy

class telepresence

flow monitor inline

record pm-ipv4

monitor parameters

interval duration 10

timeout 15

history 30

flows 255

monitor metric rtp

min-sequential 10

Traffic Class

Class-map config, same as in Cisco

Policy Language

Policy Map Type Perf Mon

Policy Map configures interface to

monitor for performance


WAN Interne

t

Metadata with Media Monitoring Integrating Flow Metadata with Performance Monitor Flow Record

34

Collect Metadata Attributes

WebEx Session is Encrypted. Perf-Mon will

collect statistics and Metadata Attributes into

a single Flow Record.

Perf-Mon Flow Records

Configures a custom Perf-Mon Flow

Record name “webex-pm”


WAN Internet

Metadata with Media Monitoring Use Flow Metadata as filter to select the interesting traffic

35

Cisco Policy Language

Recognizes WebEx Metadata

Class-map matches specific WebEx

Metadata Attributes

Create Policy (Perf-Mon)

Flow Monitor now Records Perf-Mon

metrics with Metadata Attributes


Performance Monitor Export

3

6

WAN

10.87.93.45


Telepresence

flow exporter rtp-exp

destination 10.87.91.113

transport udp 2055

!

flow exporter tcp-exp

destination 10.87.91.114

!

policy-map type performance-monitor pm-

policy

class RTP-Media

flow monitor inline

record default-rtp

exporter rtp-exp

class TCP-Vid

flow monitor inline

record default-tcp

exporter tcp-exp

!

interface GigabitEthernet0/1

service-policy type performance-monitor input pm-policy

service-policy type performance-monitor output pm-policy

Export RTP PerfMon

Stats to Netflow Collector

Configures default RTP flow record for

metric collection and Netflow Export


Exporting Perf-Mon to Netflow Collector

3

7

RTP Jitter Metrics

Netflow Collectors Report

RTP Performance Metrics For

Baseline or Trend Analysis


Proactive Monitoring Thresholds & Alerts

• Metrics can be tested against thresholds to trigger actions

Multi-level Alarm Raise/Clear, SNMP Traps, Syslog, embedded scripts, automatic mediatrace

MSI MSI


Alert Threshold for Video Conferencing

3

9

WAN

10.87.93.45


Telepresence

policy-map type performance-monitor pm-policy

class telepresence

react 1 rtp-jitter-average

threshold value gt 10

alarm severity critical

action syslog

action snmp

react 2 transport-packets-lost-rate

threshold value gt 0.05

alarm severity critical

action syslog

action snmp

>10 ms Jitter Target Threshold

Configures Target Threshold to Trigger

SNMP & Syslog Critical Alert


Syslog Message Exceeding Jitter Threshold

4

0

WAN

10.87.93.162

Telepresence

10.87.80.11

Telepresence

12 ms Jitter Induced

Alert Raised per individual 5 Tuple

Flow

Mar 22 18:17:00: %PERF_TRAFFIC_REACT-2-CRITSET: TCA RAISE.

Detailed info: Threshold value crossed - current value 12

Flow info: ipv4 source address 10.87.93.162, ipv4 destination address

10.87.80.11, transport source-port 4441, transport destination-port 3331, transport

rtp ssrc 30583,

Policy info: Policy-map pm-policy, Class telepresence

React info: id 1, criteria rtp-jitter-average, severity critical, alarm type discrete,

threshold range (10, 4294967295]

Policy Violation Indicator

Alert shows violated Policy Info and React Info


Performance Monitor on Endpoints

Perf-mon

enabled

REST

interface

NMS


Expedited Troubleshooting Using Mediatrace


Mediatrace Capabilities Network Trace Collection for Performance Metrics

43

• Automatic Network Node Discovery along media path

RSVP Messages For Transport

Traceroute Messages to Discover NON-Mediatrace Devices

• Inquires Performance Statistics from Nodes along media path

Hop By Hop Performance Analysis

User specified Mediatrace query options

• Report Consolidated Metrics on Terminal Console or NMS

Command Line Execution

EEM Script Execution

Cisco Prime Collaboration Manager 1.1 Execution


Mediatrace Components • Initiator - injects the trace

• Responder - sends data back to initiator

• Multiple types of data requests Hops – hop discovery

System – system information

Performance monitor – enables perf-mon, then collects data

• Multiple execution formats Poll – minimal config, run from IOS exec

Session – flexible configuration, allows for periodic, recurring requests and history

flow

Initiator responder responder


Mediatrace: RSVP Messages as a Transport

4

5

• Exclusive RSVP Configuration NOT required (transport only)

• RSVP messages routed on same path as media packets

• RSVP message transports collected media monitoring statistics

10.87.80.11

10.87.93.162

BR-CAT3750

RSVP-

TP

RSVP-

TP

RSVP-

TP


Mediatrace Console Output

4

6


Session Troubleshooting on CPCM Visualize the media path


Session Troubleshooting on CPCM Visualize where the issue is introduced


Session Troubleshooting on CPCM Visualize the potential root cause


Mediatrace on Endpoints

Mediatrace

Initiator

REST

interface

Responder Responder Responder

Reponder with MSI

management

NMS


Network Readiness Assessment


Network Readiness Assessment: Telepresence

Enterprise IP

Back Bone

Branch 10.1.1.0/27

Branch 20.1.1.0/24

Is the network

ready to support

Video?

5

2


Synthetic Telepresence RTP Stream

5

3

IPSLA-VO TP Video Profiles:

CTS-1080P-Better, CTS-1080P-Good, CTS-720P-Best

CTS-720P-Better, CTS-720P-Good, CTS-720P-Lite

ip sla 1

video 10.87.93.250 6666 source-ip 10.87.93.233 source-port 9999 profile CTS-

1080P-Best

duration 20

frequency 60

dscp cs4

ip sla schedule 1 life 720 start-time now

R

T

P

RT

P RT

P

RT

P

Telepresence

1080p @4 Mbps

IPSLA

Report

Sender Lo0: 10.87.93.233

Responder Lo0: 10.87.93.250

Profile Option

Cisco Telepresence System

1080p 30fps 4000kbps Best

Quality


IPSLA-VO Custom Video Traffic Profile

5

4

R

T

P

RT

P RT

P

RT

P

IP Video

Surveillance

Camera HD

1080p @4

Mbps IPSLA

Report Sender Responder

Isr-g2#show run | b ip sla

ip sla profile video IPVSC

endpoint custom

description Cisco 4000 Series HD

Camera

resolution 1080P

frame rate 30

bitrate maximum 4000

bitrate window-size 167

frame intra size maximum 100

frame intra refresh interval 1

rtp size average 1300

rtp buffer output shaped

Video Stream Parameters

Custom Video Traffic Profile Name

Profile parameters for IP Video

Surveillance Camera

RTP Traffic Stream parameters unique

to IPVSC video application


Synchronize Clock for Accurate Delay Statistics

5

5

NTP Server NTP Server

GPS Device GPS Device

GPS Satellites

GPS sync GPS sync

local NTP sync local NTP sync

HQ-R1(config)#ntp server ntp1.server.com

HQ-R1(config)#ip sla sender

BR1(config)#ntp server ntp2.server.com

BR1(config)#ip sla responder

NOT recommended to synchronize the clocks of

Sender and Responder to same NTP/SNTP server


IPSLA-VO CLI Output

5

6

IPSLA Test Results

IPSLA test duration

RTP RTP RTP RTP

IPSLA

Report

Sender

Lo0: 10.87.93.233

Responder

Lo0: 10.87.93.250

One Way Latency Results

Interpacket Delay Variation


Typical Application Impairment Targets General Guidelines

57

Application Latency Jitter Loss (VoD) Loss (Live)

Streaming Video < 1000 ms < 100 ms < 0.1% < 0.05%

Video Conferencing < 150 ms < 30 ms NA < 0.10%

TelePresence < 150 ms < 10 ms NA < 0.05%

Digital Signage < 1000 ms < 100 ms < 0.1% 0%

IPTV < 1000 ms < 100 ms < 0.1% 0%

Video Surveillance < 1000 ms < 100 ms < 0.1% < 0.05%

Source: http://www.cisco.com/en/US/docs/solutions/Enterprise/Video/tpqos.html

References

• Cisco Networking Capabilities for Medianet

http://www.cisco.com/en/US/prod/collateral/routers/ps10536/data_sheet_c78-612429.html

• Medianet Deployment Guide

http://www.cisco.com/web/solutions/medianet/knowledgebase/index.html










Take Away Implementing Optimal Video Collaboration with Medianet

59

• Design Media Aware Network

Targeted Treatment with Pinpoint Accuracy

Easy when the application provides all the description

• Performance Monitoring Tools

Getting visibility into application health and network bandwidth usage

• Fault Isolation

Increase productivity with automation

• Validation and Readiness Assessment

Test and validate remotely


Thank you.

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