Dell PowerSwitch S4820T 9.50.1 Configuration Guide for the S4820T System - Page 427
Bulk Configuration, Interface Range
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Hash seed is used to compute the hash value. By default hash seed is chassis MAC 32 bits. we can also change the hash seed by the following command. CONFIGURATION mode hash-algorithm seed {seed value} • Change to another algorithm. CONFIGURATION mode hash-algorithm [ecmp{crc16|crc16cc|crc32LSB|crc32MSB|crc-upper|dest-ip|lsb| xor1|xor2|xor4|xor8|xor16}] Example of the hash-algorithm Command Dell(conf)#hash-algorithm ecmp xor 26 lag crc 26 nh-ecmp checksum 26 Dell(conf)# The hash-algorithm command is specific to ECMP group. The default ECMP hash configuration is crclower. This command takes the lower 32 bits of the hash key to compute the egress port. Other options for ECMP hash-algorithms are: • crc16 - uses 16 bit CRC16-bisync polynomial • crc16cc - uses 16 bit CRC16 using CRC16-CCITT polynomial • crc32LSB - uses LSB 16 bits of computed CRC32 • crc32MSB - uses MSB 16 bits of computed CRC32(default) • crc-upper - uses the upper 32 bits of the hash key to compute the egress port. • dest-ip - uses destination IP address as part of the hash key. • lsb -uses always return the LSB of the key as the hash • xor1 - uses Upper 8 bits of CRC16-BISYNC and lower 8 bits of xor1 • xor2 - Upper 8 bits of CRC16-BISYNC and lower 8 bits of xor2 • xor4 -Upper 8 bits of CRC16-BISYNC and lower 8 bits of xor4 • xor8 - Upper 8 bits of CRC16-BISYNC and lower 8 bits of xor8 • xor16 - uses 16 bit XOR. Bulk Configuration Bulk configuration allows you to determine if interfaces are present for physical interfaces or configured for logical interfaces. Interface Range An interface range is a set of interfaces to which other commands may be applied and may be created if there is at least one valid interface within the range. Bulk configuration excludes from configuration any non-existing interfaces from an interface range. A default VLAN may be configured only if the interface range being configured consists of only VLAN ports. The interface range command allows you to create an interface range allowing other commands to be applied to that range of interfaces. Interfaces 427
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