Classification Based On Qos Acls; Classification Based On Qos Groups - Cisco IE-4000 Software Configuration Manual

Configuring QoS
Understanding QoS
Table 56 Typical Traffic Classifications (continued)
Traffic Type
Mission critical date (gold data)—delay-sensitive applications
critical to the operation of an enterprise.
Level 1
Level 2
Level 3
Less critical data (silver data)—noncritical, but relatively
important data.
Level 1
Level 2
Level 3
Best-effort data (bronze data)—other traffic, including all
noninteractive traffic, regardless of importance.
Less than best-effort data—noncritical, bandwidth-intensive
data traffic given the least preference. This is the first traffic type
to be dropped.
Level 1
Level 2
Level 3

Classification Based on QoS ACLs

Packets can also be classified in input policy maps based on an ACL lookup. The ACL classification is communicated to
an output policy by assigning a QoS group or number in the input policy map. To classify based on ACL lookup, you first
create an IP or MAC ACL. Configure a class map and use the match access-group {acl-number | acl name} class-map
configuration command, and attach the class map to a policy map.
Note: You cannot configure match access-group for an output policy map.
You can use IP standard, IP extended, or Layer 2 MAC ACLs to define a group of packets with the same characteristics
(a class). You use the access-list global configuration command to configure IP ACLS to classify IP traffic based on Layer
3 and Layer 4 parameters. You use the mac access-list extended global configuration command to configure Layer 2
MAC ACLs to classify IP and non-IP traffic based on Layer 2 parameters.
Note: You cannot match IP fragments against configured IP extended ACLs to enforce QoS. IP fragments are sent as
best-effort. IP fragments are denoted by fields in the IP header.
You can use only ACLs with a permit action in a match access-group command. ACLs with a deny action are never
matched in a QoS policy.
Note: Only one access-group is supported per class for an input policy map.

Classification Based on QoS Groups

A QoS group is an internal label used by the switch to identify packets as a members of a specific class. The label is not
part of the packet header and is restricted to the switch that sets the label. QoS groups provide a way to tag a packet
for subsequent QoS action without explicitly marking (changing) the packet. You can then communicate an ACL match
from an input policy map to an output policy map.
A QoS group is identified at ingress and used at egress; it is assigned in an input policy to identify packets in an output
policy. See on page
output policy.
580. The QoS groups help aggregate different classes of input traffic for a specific action in an
DSCP DSCP
per-hop (decimal)
AF21 18
AF22 20
AF23 22
AF11 10
AF12 12
AF13 14
Default 0
2
4
6
580
IP CoS
Precedence
2 2
2 2
2 2
1 1
1 1
1 1
0 0
0 0
0 0
0 0