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Examples of QoS implementation
Issue 6 January 2008 337
If any of the endpoints are incapable of tagging, the “dscp 46” can be removed from access list
101. Then any traffic between the two IP Telephony subnetworks, regardless of the tag, is in the
class “VoIP.”
Converged infrastructure LAN switches
X330 WAN Module
The new X330WAN versions contain a predefined queue management strategy for IP
Telephony that is called CBQ. Use the following procedure to activate CBQ:
8.random-detect
dscp-based
If the default queue starts to get full,
randomly discard packets in this queue
based on DSCP (lower values get discarded
first).
9.interface Serial0
description T1 ip
address 172.16.0.1
service-policy output
voipQoS
Apply the “voipQoS” policy outbound on this
interface.
Table 60: Administration commands for Example 3
Command Meaning
Table 61: X330 WAN Module administration commands
Command Meaning
1.set qos policy-source
local
Define DSCP-CoS mapping.
! no external policy source
2.ip access-list-name 100
voice
set up access-list 100 with name “voice”.
3.ip access-list-dscp
operation 100 34 fw7
The X330 WAN has four queues with eight
behaviors. fw6 and fw7 are different
behaviors within the top strict priority queue.
4.ip access-list-dscp
operation 100 46 fw6
In access-list 100, map DSCP 46 to the fw6
queue.
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