Classification Based On Qos Acls; Classification Based On Qos Groups - Cisco ME 3400 Software Configuration Manual
Ethernet access switch
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Understanding QoS
Table 33-1
Typical Traffic Classifications (continued)
Traffic Type
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.
You cannot match IP fragments against configured IP extended ACLs to enforce QoS. IP fragments are
Note
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
traffic for a specific action in an output policy.
Cisco ME 3400 Ethernet Access Switch Software Configuration Guide
33-10
DSCP
per-hop
Default
Figure
33-3. The QoS groups help aggregate different classes of input
Chapter 33
DSCP
IP
(decimal)
Precedence
0
0
2
0
4
0
6
0
Configuring QoS
CoS
0
0
0
0
OL-9639-07
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Troubleshooting
