Dell S4048T User Manual

Changing the Hash Algorithm
The load-balance command selects the hash criteria applied to port channels.
If you do not obtain even distribution with the load-balance command, you can use the hash-algorithm
command to select the hash scheme for LAG, ECMP and NH-ECMP. You can rotate or shift the 12–bit Lag
Hash until the desired hash is achieved.
To change to another algorithm, use the second command.
• Change the default (0) to another algorithm and apply it to ECMP, LAG hashing, or a particular line card.
CONFIGURATION mode
hash-algorithm {ecmp {crc16 | crc16cc | crc32MSB | crc32LSB | crc-upper | dest-
ip | flow-based-hashing {crc16|crc16cc|crc32MSB|crc32LSB|xor1|xor2|xor4|xor8|
xor16}|lsb | xor1 | xor2 | xor4 | xor8 | xor16}[[hg {crc16 | crc16cc | crc32MSB
| crc32LSB | xor1 | xor2 | xor4 | xor8 | xor16}]| [lag {crc16 | crc16cc |
crc32MSB | crc32LSB | xor1 | xor2 | xor4 | xor8 | xor16 }][stack-unit|linecard
number | port-set number | [hg—seed seed-value | seedseed-value
For more information about algorithm choices, refer to the command details in the IP Routing chapter of
the Dell Networking OS Command Reference Guide.
• 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
The hash-algorithm command is specific to ECMP group. The default ECMP hash configuration is crc-
lower. This command takes the lower 32 bits of the hash key to compute the egress port. Other options for
ECMP hash-algorithms are:
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.
Interfaces 473

Dell S4048T Specifications

General

Switching Capacity	1.44 Tbps
Rack Units	1U
Form Factor	Rack-mountable
Power Device	Internal power supply
Power Redundancy	Optional
Product Type	Switch
Jumbo Frame Support	Yes
Routing Protocol	OSPF, BGP, RIP, VRRP, PIM-SM, IGMP
Remote Management Protocol	SNMP, RMON, Telnet, SSH
Features	Quality of Service (QoS), Jumbo Frames Support, Virtual Route Redundancy Protocol (VRRP), VLAN support, sFlow, Multiple Spanning Tree Protocol (MSTP), Rapid Spanning Tree Protocol (RSTP), IPv6 support
Compliant Standards	IEEE 802.3, IEEE 802.3u, IEEE 802.3ab, IEEE 802.3ae
Dimensions (W x D x H)	17.3 in x 16 in x 1.7 in
Operating Temperature	0°C to 40 °C
Operating Humidity	10% to 90% (non-condensing)