Black Box LWN602A User Manual page 149

Chapter 11: Deployment Examples CLI
You next define a QoS policy that defines how the cluster members prioritize and process the traffic mapped to Classes 6, 5, and
3. The QoS policy (named "voice") is shown in Figure 11-9 and has these settings:
Class 6 (voice)
Forwarding: strict (Cluster members forward traffic mapped to this class immediately without queuing it.)
Maximum rate for all Class 6 traffic: 512 kbps, which supports an 8- to 64-kbps VoIP call (depending on the compression that the
codec provides) plus other telephony traffic such as DHCP, DNS, HTTP, and TFTP.
Class 5 (streaming media)
Forwarding: WRR (weighted round robin) with a weight of 90
By assigning class 5 a higher weight (90) than Class 3 and 2 weights (Class 3 = 60, Class 2 = 30), you give streaming media
roughly a 3:2 priority over Class 3 traffic and a 3:1 priority over Class 2 traffic.
Maximum traffic rate for all Class 5 traffic: 20,000 kbps
You change the bandwidth available for streaming media when there is no competition for it (the default rate for Class 5 is
10,000 kbps on SmartPath APs that do not support the IEEE 802.11n standard and 50,000 kbps on SmartPath APs that do.
However, you do not set the maximum rate (54,000 or 1,000,000 kbps, depending on the SmartPath AP model that you are con-
figuring) to ensure that streaming media does not consume all available bandwidth even if it is available.
Class 3 (e-mail)
Forwarding: WRR with a weight of 60
To help ensure that e-mail traffic remains flowing even when other types of data traffic compete with it for available bandwidth,
you elevate its priority by mapping SMTP and POP3 traffic to Class 3 and giving that class a higher weight (60) than the weight
for Class 2 traffic (30).
Maximum traffic rate for all Class 3 traffic: 54,000 or 1,000,000 kbps (the default, depending on the SmartPath AP)
NOTE: The SmartPath AP assigns all traffic that you do not specifically map to a class to Class 2, which by default uses WRR with a
weight of 30 and a rate of 54,000 or 1,000,000 kbps, depending on the SmartPath AP.
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