Cisco Cisco Extended Care 1.0 Design Guide

4-5

Cisco Extended Care 1.0 Solution Design Guide

OL-30842-01

Chapter 4 Cisco Extended Care Bandwidth Requirements and Quality of Service Recommendations

Marking Cisco Extended Care Traffic

Best Practices for Converged Networks

In addition to the above best practices, the following best practices apply to converged networks:

•

Limit the amount of real-time voice and video traffic to 33% of the link capacity or else data may
be starved out resulting in very slow and erratic performance of data applications.

•

Reserve at least 25% of the link bandwidth for the default Best Effort data class.

•

Utilize a 1% Scavenger or Low-Priority class to ensure that unruly applications do not dominate
your default Best Effort data class.

•

Use Weighted Random Early Detection (WRED) on all TCP flows, where ever possible, preferably
DSCP-based WRED.

Marking Cisco Extended Care Traffic

The recommended marking for traffic is as follows:

•

Cisco TelePresence System 500: Class Selector 4 (CS4)

Application

L3 Classification
PHB

L3 Classification
DSCP

Application
Examples

Network Control / Routing

CS6

EIGRP, OSPF,
HSRP, IKE

VoIP Telephony / Voice

Cisco IP Phone

Broadcast Video (RFC 4594
only)

CS3 by RFC 4594,

CS5 by Cisco

24 by RFC4594,

40 by Cisco

Cisco IPVS,
Enterprise TV

Real-time Interactive

CS4

Cisco TelePresence
System 500

Multimedia Conferencing

AF4

Cisco CUPC,
WebEx, Interactive
Video

Multimedia Streaming

AF3 or CS4

Cisco DMS, IP/TV,

Call Signaling (same name
used by both)

CS5 by RFC 4594,

CS3 by Cisco

40 by RFC4594,

24 by Cisco

SCCP, SIP, H323

Low-Latency Data /
Transactional Data

AF21

ERP Apps, CRM
Apps

Operations/Administration
/Management (OAM) /
Network Management

CS2

SNMP, SSH, Syslog

High-Throughput Data /
Bulk Data

AF11

Email, FTP,
Backups

Best Effort - same name
used by both

Default Class

Low-Priority Data /
Scavenger

CS1

You Tube, Gaming,
P2P