Cisco ME 3400 - Page 88

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Cisco ME 3400 Ethernet Access Switch Command Reference
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Chapter 2 Cisco ME 3400 Ethernet Access Switch Cisco IOS Commands
cpu traffic qos cos
If the cpu traffic qos cos global configuration command is configured with only a map from value of
IP-DSCP or IP-precedence:
• The CoS value of IP packets is mapped by using the IP-DSCP (or IP-precedence) value in the packet
and the configured table map. Packets can be classified and queued by an output policy map based
on the marked CoS value.
• The CoS value of non-IP packets remains unchanged.
If the cpu traffic qos cos global configuration command is configured with a map from value of CoS:
• The CoS value of IP packets is mapped by using the CoS value in the packet and the configured table
map. Packets can be classified and queued by an output policy map based on the marked CoS value.
• The CoS value of non-IP packets is mapped by using the CoS value in the packet and the configured
table map. Packets can be classified and queued by an output policy map based on the marked CoS
value.
If the cpu traffic qos cos global configuration command is configured with a map from value of DSCP
or precedence and CoS:
• The CoS value of IP packets is mapped by using the DSCP or precedence value in the packet and
the configured table map. Packets can be classified and queued by an output policy map based on
the marked CoS value.
• The CoS value of non-IP packets is mapped by using the CoS value in the packet and the configured
table map. Packets can be classified and queued by an output policy map based on the marked CoS
value.
Examples This example shows how to mark the CoS of CPU-generated IP traffic (including IP-SLA and TWAMP)
based on the DSCP value in the packet and to configure egress queuing based on the CoS value.
The sample configuration has these results:
• All CPU-generated IP traffic is queued on the egress port based on the DSCP value and the
configured output policy map called output-policy.
• All IP SLA or TWAMP probes with the DSCP value ef to simulate voice traffic are assigned to the
voice class.
• All IP SLA or TWAMP probes with the DSCP values af41, af42 and af43 to simulate video traffic
are assigned to the video class.
• All IP control protocol traffic with the DSCP values 48 and 56 are assigned to the
network-internetwork-control class.
• The rest of the IP traffic is assigned to the default class.
• All CPU-generated non-IP traffic with CoS 5 is assigned to the voice class.
• All CPU-generated non-IP traffic with CoS 3 is assigned to the video class.
• All CPU-generated non-IP traffic with CoS 6 and 7 is assigned to the network-internetwork-control
class.
• All CFM traffic with CoS 5 is assigned to the voice class.
• All CFM traffic with CoS 3 is assigned to the video class.
• All CFM traffic with CoS 6 and 7 is assigned to the network-internetwork-control class.