Specifications

QoS Policy-Based Configuration Example
May 09, 2011 Page 31 of 38
QoS Policy-Based Configuration Example
Inourexample,anorganization’snetworkadministratorneedstoassurethatVoIPtraffic,both
originatinginandtransitingthenetworkofS‐SeriesedgeswitchesandaS‐Seriescorerouter,is
configuredforQoSwithappropriatepriority,ToS,andqueuetreatment.Wewillalsoratelimitthe
VoIPtrafficat
theedgeto1024KbpstoguardagainstDOSattacks,VoIPtrafficintothecoreat25
Mbps,andH.323callsetupat5pps.Datatrafficretainsthedefaultconfiguration.
ThisexampleplacesQoSconfigurationwithinapolicycontext.Policyisnotrequiredtoconfigure
QoS.
Thisexampleassumes
CEPauthenticationusingH.323forVoIP .Ifyouarenotauthenticatingyour
VoIPendpointwithCEPH.323authentication,youwillneedtoadjusttheVoIPpolicy
accordingly.Forinstance,SIPusesUDPport5060,nottheTCPport1720.
Tosimplifythisdiscussionoftheconfigurationprocess,thisexampleis
limitedtotheVoIP
configurationcontext.Table 2providesasetofsamplevaluesforpriority,IRL,and transmitqueue
acrossanumberofrealworldtraffictypes.Thistablecanbeusedasanaidinthinkingabouthow
youmightwanttoapplyCoSacrossyournetwork.Notethat
scavengerclassistrafficthatshould
betreatedaslessthanbesteffort:externalwebtraffic,forinstance.
Figure 7displaysthenetworksetupforthisexampleconfiguration,withthedesiredProfile/QoS
summaryforeachnetworknode.EachnodeisconfiguredwithVoIPandDataVLANs.EachVoIP
VLANcontainsfour1‐gigabitinterfacesforeachnode.
Notes: Enterasys highly recommends that you use the NetSight Policy Manager to
configure QoS on your network, whether you are applying policy or not. This example
discusses the QoS configuration using Policy Manager followed by CLI input summaries.
Table 2 CoS Sample Values By Traffic Type
Name Priority
IRL
Transmit Queue
Queue # Shaping WFQ
Edge Core Edge Core Edge Core Edge Core
Loop Detect 0 10 PPS 10 PPS
0 0 10% 5% 5%
Scavenger 0 15 Mbps
Best Effort 1
1 1 80% 45% 45%Bulk Data 2
Critical Data 3
Network Control 4 40 PPS 1 Mbps
2 2 1Mbps
25% 25%
Network
Management
52 Mbps
RTP 6
1 Mbps 25 Mbps 3 3 25% 25%
Voice/Video 7