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Cisco AVVID Network Infrastructure Enterprise Quality of Service Design
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Chapter 3 QoS in an AVVID-Enabled Campus Network
Server Farm Switch Selection
Step 1
Add an entry to the ACL_VOIP_CONTROL access list to marking all traffic from MGCP gateways with
a DSCP value of AF31.
cat6k-access> (enable) set qos acl ip ACL_VOIP_CONTROL dscp 26 udp any any eq 2427
Step 2
Inform the Cisco CallManager port (4/2) that all QoS associated with the port will be done on a port basis
cat6k-access> (enable) set port qos 4/2 port-based
Step 3
Inform the Cisco MGCP gateway port (4/4) that all QoS associated with the port will be done on a port
basis
cat6k-access> (enable) set port qos 4/4 port-based
Step 4
Write the ACL to hardware.
cat6k-access> (enable) commit qos acl ACL_VOIP_CONTROL
Step 5
Map the ACL_VOIP_CONTROL ACL to the Cisco CallManager port and the MGCP gateway port.
cat6k-access> (enable) set qos acl map ACL_VOIP_CONTROL 4/2
cat6k-access> (enable) set qos acl map ACL_VOIP_CONTROL 4/4
Verifying the ACLs
Use the following show command and its associated output for verifying that the ACLs are associated
with the correct VLANs and ports.
cat6k-access> (enable) sh qos acl map run all
ACL name Type Vlans
-------------------------------- ---- -------------------------------
ACL_IP-PHONES IP 110,111,112
ACL name Type Ports
-------------------------------- ---- -------------------------------
ACL_IP-PHONES IP
ACL name Type Vlans
-------------------------------- ---- -------------------------------
ACL_VOIP_CONTROL IP
ACL name Type Ports
-------------------------------- ---- -------------------------------
ACL_VOIP_CONTROL IP 4/2,4/3,4/4
Mission-Critical Data
As discussed earlier, the classification of any type of traffic as mission-critical could be a controversial
move. Take care when classifying mission-critical data.
The following configuration example uses a Catalyst 4006 with Supervisor III. In this example, the
switch marks IP traffic to and from a specific TCP/IP address with a DSCP of AF21.
Step 1
Enable switch-wide QoS.
4006-SUPIII-Access(config)#qos