Specifications

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Cisco Security Appliance Command Line Configuration Guide
OL-6721-01
Chapter 20 Applying QoS Policies
Classifying Traffic for QoS
hostname(config-cmap)# match tunnel-group tunnel-grp1
hostname(config-cmap)# match flow ip destination-address
hostname(config-cmap)# exit
hostname(config)#
The following example shows a way of policing a flow within a tunnel, provided the classed traffic is
not specified as a tunnel, but does go through the tunnel. In this example, 192.168.10.10 is the address
of the host machine on the private side of the remote tunnel, and the access list is named “host-over-l2l”.
By creating a class-map (named “host-specific”), you can then police the “host-specific” class before the
LAN-to-LAN connection polices the tunnel. In this example, the “host-specific” traffic is rate-limited
before the tunnel, then the tunnel is rate-limited:
hostname# access-list host-over-l2l extended permit ip any host 192.168.10.10
hostname# class-map host-specific
hostname# match access-list host-over-l2l
The following table summarizes the match command criteria available and relevant to QoS. For the full
list of all match commands and their syntax, see Cisco Security Appliance Command Reference:
In addition to the user-defined classes, a system-defined class named class-default also exists. This
class-default represents all packets that do not match any of the user-defined classes, so that policies can
be defined for these packets.
Command Description
match access-list Matches, by name or number, access list traffic within a class map.
match any Identifies traffic that matches any of the criteria in the class map.
match dscp Matches the IETF-defined DSCP value (in an IP header) in a class map. You
can specify up to 64 different dscp values, defining the class as composed of
packets that match any of the specified values.
match flow ip
destination-address
Enables flow-based policy actions. The criteria to define flow is the
destination IP address. All traffic going to a unique IP destination address is
considered a flow. Policy action is applied to each flow instead of the entire
class of traffic. This command always accompanies match tunnel group.
For remote-access VPNs, this command applies to each remote-access host
flow. For LAN-to-LAN VPNs, this command applies to the single
aggregated VPN flow identified by the local and remote tunnel address pair.
match port Specifies the TCP/UDP ports as the comparison criteria for packets received
on that interface.
match precedence Matches the precedence value represented by the TOS byte in the IP header.
You can specify up to 8 different precedence values, defining the class as
composed of packets that match any of the specified values.
match rtp Matches traffic that uses a specific RTP port within a specified range. The
allowed range is targeted at capturing applications likely to be using RTP.
The packet matches the defined class only if the UDP port falls within the
specified range, inclusive, and the port number is an even number.
match tunnel group Matches every tunnel within the specified tunnel group.