Dell S3100 Command Line Reference Guide for the Series 9.112.0P2 - Page 574
ip ecmp-group
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Version 8.3.19.0 8.3.11.1 8.3.10.0 8.1.1.0 7.8.1.0 7.7.1.1 Description Introduced on the S4820T. Introduced on the Z9000. Introduced on the S4810. Introduced on the E-Series. Added the nh-ecmp option. Added the nh-ecmp option. Usage Information To ensure that CRC is not used for LAG, set the default hash-algorithm method on E-Series systems. For example,hash-algorithm ecmp xor lag checksum nh-ecmp checksum. The hash value calculated with the hash-algorithm command is unique to the entire unit. The hash algorithm command with the stack-unit option changes the hash for a particular stack-unit by applying the mask specified in the IPSA and IPDA fields. The stack-unit option is applicable with the lag-hash-align microcode only. Any other microcode returns an error message as follows: • Dell(conf)#hash-algorithm linecard 5 ip-sa-mask ff ip-da-mask ff • % Error: This command is not supported in the current microcode configuration The different hash algorithms are based on the number of Port Channel members and packet values. The default hash algorithm (number 0) yields the most balanced results in various test scenarios, but if the default algorithm does not provide a satisfactory distribution of traffic, use the hash-algorithm command to designate another algorithm. When a Port Channel member leaves or is added to the Port Channel, the hash algorithm is recalculated to balance traffic across the members. ip ecmp-group Enable and specify the maximum number of ecmp that the L3 CAM hold for a route, By default, when maximum paths are not configured, the CAM can hold a maximum of 16 ecmp per route. Syntax ip ecmp-group {maximum-paths | {number} {path-fallback} To negate a command, use the no ip ecmp-group maximum-paths {number} command. Parameters maximum-paths path-fallback Specify the maximum number of ECMP for a route. The range is 2 to 64. Use the keywords path-fallback to enable this feature. If you enable the feature, reenter this keyword to disable the feature. Defaults Command Modes 16 CONFIGURATION 574 Equal Cost Multi-Path (ECMP)
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