Cisco IE-3000-8TC Software Configuration Manual page 680

Configuring Auto-QoS
Table 36-3
Table 36-3
Ingress Queue
SRR shared
Priority
Table 36-4
Table 36-4 Auto-QoS Configuration for the Egress Queues
Egress Queue Queue Number
Priority 1
SRR shared 2
SRR shared 3
SRR shared 4
When you enable the auto-QoS feature on the first port, these automatic actions occur:
•
•
•
•
Cisco IE 3000 Switch Software Configuration Guide
36-20
shows the generated auto-QoS configuration for the ingress queues.
Auto-QoS Configuration for the Ingress Queues
Queue Number
1
2
shows the generated auto-QoS configuration for the egress queues.
CoS-to-Queue Map
5
3, 6, 7
2, 4
0, 1
QoS is globally enabled (mls qos global configuration command), and other global configuration
commands are added.
When you enter the auto qos voip cisco-phone interface configuration command on a port at the
edge of the network that is connected to a Cisco IP Phone, the switch enables the trusted boundary
feature. The switch uses the Cisco Discovery Protocol (CDP) to detect the presence or absence of a
Cisco IP Phone. When a Cisco IP Phone is detected, the ingress classification on the port is set to
trust the QoS label received in the packet. The switch also uses policing to determine whether a
packet is in or out of profile and to specify the action on the packet. If the packet does not have a
DSCP value of 24, 26, or 46 or is out of profile, the switch changes the DSCP value to 0. When a
Cisco IP Phone is absent, the ingress classification is set to not trust the QoS label in the packet. The
switch configures ingress and egress queues on the port according to the settings in
Table 36-4. The policing is applied to those traffic matching the policy-map classification before the
switch enables the trust boundary feature.
When you enter the auto qos voip cisco-softphone interface configuration command on a port at
the edge of the network that is connected to a device running the Cisco SoftPhone, the switch uses
policing to determine whether a packet is in or out of profile and to specify the action on the packet.
If the packet does not have a DSCP value of 24, 26, or 46 or is out of profile, the switch changes the
DSCP value to 0. The switch configures ingress and egress queues on the port according to the
settings in Table 36-3 and
When you enter the auto qos voip trust interface configuration command on a port connected to the
interior of the network, the switch trusts the CoS value for nonrouted ports in ingress packets (the
assumption is that traffic has already been classified by other edge devices). The switch configures
the ingress and egress queues on the port according to the settings in
For information about the trusted boundary feature, see the
Ensure Port Security" section on page
CoS-to-Queue Map
0, 1
2, 3, 4, 5, 6, 7
Queue Weight
(Bandwidth)
up to100 percent
10 percent
60 percent
20 percent
Table 36-4.
36-35.
Chapter 36
Queue Weight Queue (Buffer)
(Bandwidth) Size
81 percent 67 percent
19 percent 33 percent
Queue (Buffer) Size Queue (Buffer)
for Gigabit-Capable Size for 10/100
Ports Ethernet Ports
16 percent 10 percent
6 percent 10 percent
17 percent 26 percent
61 percent 54 percent
Table 36-3 and
"Configuring a Trusted Boundary to
Configuring QoS
Table 36-3 and
Table 36-4.
OL-13018-03