Create Wred Profiles; Apply A Wred Profile To Traffic; Configure Wred For Storm Control - Dell Force10 C150 Configuration Manual

You can create a custom WRED profile or use on of the five pre-defined profiles listed in
Table 41-7. Pre-defined WRED Profiles
Default Profile
Minimum
Name
Threshold
wred_drop 0
wred_ge_y 1024
wred_ge_g 2048
wred_teng_y 4096
wred_teng_g 8192

Create WRED Profiles

To create a WRED profile:
1. Create a WRED profile using the command
wred
2. The command
threshold values using the command

Apply a WRED profile to traffic

Once you create a WRED profile you must specify to which traffic FTOS should apply the profile.
FTOS assigns a color (also called drop precedence)—red, yellow, or green—to each packet based on it
DSCP value before queuing it. DSCP is a 6 bit field. Dell Force10 uses the first three bits of this field (DP)
to determine the drop precedence. DP values of 110 and 100 map to yellow, and all other values map to
green. If you do not configure FTOS to honor DSCP values on ingress
packets on page 865) see all traffic defaults to green drop precedence.
Assign a WRED profile to either yellow or green traffic from QOS-POLICY-OUT mode using the
wred
command .

Configure WRED for Storm Control

Configure WRED for Storm Control
Storm control limits the percentage of the total bandwidth that broadcast traffic can consume on an
interface (if configured locally) or on all interfaces (if configured globally). For
out
, the total bandwidth that broadcast traffic can consume on egress on a 1Gbs interface is 512Mbs. The
method by which packets are selected to be dropped is the "tail-drop" method, where packets exceeding
the specified rate are dropped.
Maximum
Threshold
0
2048
4096
8192
16384
places you in WRED mode. From this mode, specify minimum and maximum
threshold
is supported only on platform
wred
from CONFIGURATION mode.
.
(Honor DSCP values on ingress
e
Table 41-7.
storm-control broadcast 50
Quality of Service | 871