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146 Quality of Service
Set the CoS queue configuration for the (presumed) egress interface 1/g5 such that each of queues 1, 2,
3 and 4 get a minimum guaranteed bandwidth of 25%. All queues for this interface use weighted round
robin scheduling by default. The DiffServ inbound policy designates that these queues are to be used for
the departmental traffic through the assign-queue attribute. It is presumed that the switch will forward
this traffic to interface 1/g5 based on a normal destination address lookup for internet traffic.
interface ethernet 1/g5
cos-queue min-bandwidth 0 25 25 25 25 0 0
exit
exit
DiffServ for VoIP Configuration Example
One of the most valuable uses of DiffServ is to support Voice over IP (VoIP). VoIP traffic is inherently
time-sensitive: for a network to provide acceptable service, a guaranteed transmission rate is vital. This
example shows one way to provide the necessary quality of service: how to set up a class for UDP traffic,
have that traffic marked on the inbound side, and then expedite the traffic on the outbound side. The
configuration script is for Router 1 in the accompanying diagram: a similar script should be applied to
Router 2.