Dell Force10 S4820T FTOS Command Reference Guide - Page 520
hash-algorithm d
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www.dell.com | support.dell.com Related Commands load-balance (C-Series and S-Series) hash-algorithm d e Select the d value for the ECMP, LAG, and NH hashing algorithm. Syntax hash-algorithm d value [linecard slot] [port-set number] Parameters d value linecard slot port-set number Enter the keyword followed by the d value. Range: 0 to 4095 Enter the keyword linecard followed by the linecard slot number. Enter the keyword port-set followed by the linecard port-pipe number. Defaults None Command Modes CONFIGURATION Command History Usage Information Version 8.3.1.0 Introduced on E-Series. Deterministic ECMP sorts ECMPs in order even though RTM provides them in a random order. However, the hash algorithm uses as a d the lower 12 bits of the chassis MAC, which yields a different hash result for every chassis. This means that for a given flow, even though the prefixes are sorted, two unrelated chassis will select different hops. FTOS provides a CLI-based solution for modifying the hash d to ensure that on each configured system, the ECMP selection is same. When configured, the same d is set for ECMP, LAG, and NH, and is used for incoming traffic only. Note: While the d is stored separately on each port-pipe, the same d is used across all CAMs. Note: You cannot separate LAG and ECMP, but you can use different algorithms across chassis with the same d. If LAG member ports span multiple port-pipes and line cards, set the d to the same value on each port-pipe to achieve deterministic behavior. Note: If the hash algorithm configuration is removed. Hash d will not go to original factory default setting. 520 | Equal Cost Multi-Path