Chapter29 Quality of Service
Editing QoS Policies
29-18
Cisco Router and Security Device Manager 2.5 User’s Guide
OL-4015-12
Edit Match DSCP Values
To add a DSCP value to the match list, choose a value from the Available DSCP
Valu es column on the left, and click the top double-arrowhead button to add it to
the Selected DSCP Values column. To remove a value from the Selected DSCP
Valu es column, choose the value and click the bottom double-arrowhead button.
Action Choose the action that the router is to take when it finds traffic that
matches the specified DSCP values.
•Drop—Drop the traffic. If you select Drop, other options in the
Action area are disabled.
•Set DSCP— Choose the DSCP value that you want the traffic
to be reset to.
•Queuing— LLQ is available if the traffic uses the RTP protocol
or has a DSCP value of EF. If the traffic does not have these
attributes, the LLQ option is not available. If you are adding or
editing the default class—class-default—only Fair Queuing is
available.
•Bandwidth Percentage—The percentage value that you enter
is used as an absolute percentage of the total bandwidth on the
interface.
•Bandwidth Remaining Percentage—The percentage value
that you enter is used as a relative percentage of the total
bandwidth on the interface. For instance, you can specify that
30 percent of the available bandwidth be allocated to one class,
and 60 percent of the bandwidth be allocated to another QoS
class. To use this option, all other classes must use this option.
The Bandwidth Remaining Percentage option is disabled if
LLQ is selected.
•Random Detect—Enables Weighted Random Early Detection
(WRED) and Distributed WRED (DWRED) on the router. This
option is disabled if LLQ is selected. Random Early Detection
drops packets during periods of high congestion, thus telling
the source host to decrease the transmission rate.
Table29-12 Add or Edit a QoS Class (continued)
Element Description