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QoS Configuration Example
QoS Configuration Example
In our example, an organization's network administrator needs to assure that VoIP traffic, both
originating in and transiting the network of N‐Series edge switches and a DFE core router, is
configured for QoS with appropriate priority, ToS, and queue treatment. We will also rate limit the
VoIP traffic to 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.
For purposes of avoiding complexity that would get in the way of understanding the
configuration process, this example limits the discussion to the VoIP configuration context. Table
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.
Table 1 CoS Sample Values By Traffic Type
Name
Loop Detect
Scavenger
Best Effort
Bulk Data
Critical Data
Network Control
Network
Management
RTP
Voice/Video
Figure
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.
February 22, 2008
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.
IRL
Priority
Edge
0
10 PPS
0
15 Mbps
1
2
3
4
40 PPS
5
2 Mbps
6
1 Mbps
7
7 displays the network setup for this example configuration, with the desired Profile/QoS
Queue #
Core
Edge
10 PPS
0
1
1 Mbps
2
25 Mbps
3
Transmit Queue
Shaping
Core
Edge
Core
0
10%
1
80%
2
1Mbps
3
1
WFQ
Edge
Core
5%
5%
45%
45%
25%
25%
25%
25%
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