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Cisco ME 3400 Ethernet Access Switch Software Configuration Guide
OL-9639-07
Chapter 33 Configuring QoS
Configuring QoS
This example shows how to create a Layer 2 MAC ACL with two permit statements. The first statement
allows traffic from the host with MAC address 0001.0000.0001 to the host with MAC
address
0002.0000.0001. The second statement allows only Ethertype XNS-IDP traffic from the host
with MAC address 0001.0000.0002 to the host with MAC address 0002.0000.0002.
Switch(config)# mac access-list extended maclist1
Switch(config-ext-macl)# permit 0001.0000.0001 0.0.0 0002.0000.0001 0.0.0
Switch(config-ext-macl)# permit 0001.0000.0002 0.0.0 0002.0000.0002 0.0.0 xns-idp
Switch(config-ext-macl)# exit
Using Class Maps to Define a Traffic Class
You use the class-map global configuration command to name and to isolate a specific traffic flow (or
class) from all other traffic. A class map defines the criteria to use to match against a specific traffic flow
to further classify it. Match statements can include criteria such as an ACL, CoS value, DSCP value, IP
precedence values, QoS group values, or VLAN IDs. You define match criterion with one or more match
statements entered in the class-map configuration mode.
Follow these guidelines when configuring class maps:
• A match-all class map cannot have more than one classification criterion (one match statement), but
a match-any class map can contain multiple match statements.
• The match cos and match vlan commands are supported only on Layer 2 802.1Q trunk ports.
• You use a class map with the match vlan command in the parent policy in input hierarchical policy
maps for per-port, per-VLAN QoS on trunk ports. A policy is considered a parent policy map when
it has one or more of its classes associated with a child policy map. Each class within a parent policy
map is called a parent class. You can configure only the match vlan command in parent classes. You
cannot configure the match vlan command in classes within the child policy map.
• For an input policy map, you cannot configure an IP classification (match ip dscp, match ip
precedence, match ip acl) and a non-IP classification (match cos or match mac acl) in the same
policy map or class map. For a per-port, per-VLAN hierarchical policy map, this applies to the child
policy map.
• You cannot configure match qos-group for an input policy map.
• In an output policy map, no two class maps can have the same classification criteria; that is, the same
match qualifiers and values.
• The maximum number of class maps on the switch is 1024.
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