Dell Force10 S55T S55 Configuration Guide FTOS 8.3.5.3 - Page 579
Create WRED Profiles, Apply a WRED profile to traffic, Con WRED for Storm Control
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You can create a custom WRED profile or use on of the five pre-defined profiles listed in Table 31-7. Table 31-7. Pre-defined WRED Profiles Default Profile Minimum Name Threshold wred_drop wred_ge_y wred_ge_g wred_teng_y wred_teng_g 0 1024 2048 4096 8192 Maximum Threshold 0 2048 4096 8192 16384 Create WRED Profiles To create a WRED profile: 1. Create a WRED profile using the command wred from CONFIGURATION mode. 2. The command wred places you in WRED mode. From this mode, specify minimum and maximum threshold values using the command threshold. 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 (Honor DSCP values on ingress packets on page 573) 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 command wred. Configure WRED for Storm Control e Configure WRED for Storm Control is supported only on platform 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 storm-control broadcast 50 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. Quality of Service | 579
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