Dscp Marking; How To Display The Dscp Marking Configuration; Counting Dropped Packets; About Counting Dropped Packets - Cisco SCE8000 Configuration Manual

DSCP Marking

DSCP Marking
DSCP marking is used in IP networks as a means to signal the priority of a packet. The Cisco Service
Control solution supports the DSCP classification on a per-service, per-package level via the SCA BB
application. The SCE platform DSCP marking feature enables marking the DSCP field in the IP header
of each packet according to the policy configured via the SCA BB console. The actual DSCP value set
in the IP header is determined according to the value defined in a configurable DSCP translation table.
DSCP marking configuration is performed via the SCA BB console, The SCE platform CLI allows you
to view the state of DSCP marking (enabled or disabled) for each interface and to display the DSCP
translation table.
For information on configuring DSCP marking, please refer to the Cisco Service Control Application for
Broadband User Guide (for any SCA BB release 3.1.5 or later).
DSCP marking in release 3.1.5 or later is not backwards compatible with any SCOS version prior to
Note
release 3.1.5.

How to Display the DSCP Marking Configuration

Use this command to display the state of DSCP marking (enabled or disabled) per interface and the
DSCP translation table.
From the SCE> prompt, type show interface linecard 0 ToS-marking and press Enter.
Step 1

Counting Dropped Packets

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About Counting Dropped Packets

By default, the SCE platform hardware drops WRED packets (packets that are marked to be dropped due
to BW control criteria). However, this presents a problem for the user who needs to know the number of
dropped packets per service. To be able to count dropped packets per service, the traffic processor must
see all dropped packets for all flows. However, if the hardware is dropping red packets, the traffic
processor will not be able to count all dropped packets and the user will not get proper values on the
relevant MIB counters (tpTotalNumWredDiscardedPackets).
Note The MIB object tpTotalNumWredDiscardedPackets counts dropped packets. The value in this counter is
absolute only when hardware packet drop is disabled (not the default mode). When hardware packet drop
is enabled (default mode), this MIB counter provides only a relative value indicating the trend of the
number of packet drops, with a factor of approximately 1:6.
Cisco SCE8000 Software Configuration Guide
6-16
About Counting Dropped Packets, page 6-16
Disabling the Hardware Packet Drop, page 6-17
Chapter 6 Configuring the Line Interface
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