The Match Command - Cisco 3845 - Security Bundle Router Software Manual

Understanding QoS
Figure 27-2
Layer 2 IEEE 802.1Q and IEEE 802.1p Frame
Preamble
Layer 3 IPv4 Packet
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The match Command

In class-map configuration mode, you use the match class-map configuration command to define the
match criterion for the traffic. You can also create a class map that requires that all matching criteria in
the class map be in the packet header by using the class map match-all class-map name global
configuration command.
The match-all keyword is supported only for outer and inner VLAN, or outer and inner CoS matches
Note
for QinQ packets and is rejected for all other mutually exclusive match criteria. You can configure only
one match entry in a match-all class map
Cisco ME 3800X and 3600X Switch Software Configuration Guide
27-6
QoS Classification Layers in Frames and Packets
Start frame
delimiter
3 bits used for CoS
(IEEE 802.1p user priority)
Version ToS
length 1 Byte
7 6 5
IP precedence
DSCP
Standard IPv4:
MSBs called IP precedence
"The match Command" section on page 27-6
"Classification Based on Layer 2 CoS" section on page 27-7
"Classification Based on IP Precedence" section on page 27-7
"Classification Based on IP DSCP" section on page 27-7
"CoS Mapping" section on page 27-8
"Ingress Classification Based on QoS ACLs" section on page 27-9
"Classification Based on QoS Groups" section on page 27-10
"Classification Based on Discard Class" section on page 27-11
"Classification Based on VLAN IDs" section on page 27-11
"Classification for MPLS and EoMPLS" section on page 27-11
DA SA Type
2 Bytes
PRI CFI
Len ID Offset TTL
4 3 2
Chapter 27
TAG
PT Data
VLAN ID
Proto FCS IP-SA
1 0
Flow control
for DSCP
Configuring QoS
FCS
IP-DA Data
OL-23400-01