6 l3 hashselect, 7 show arp – PLANET XGS3-24040 User Manual
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17.5.6 l3 hashselect
Command:
l3 hashselect [<crc16l|crc16u|crc32l|crc32u|lsb>]
Function:
Set L3 table (hardware ARP table) HASH algorithm.
Parameters:
crc32u.
Command Mode:
Global Configuration Mode.
Usage Guide:
HASH algorithm is a fast searching algorithm. Setting that of L3 table will change the storage
location and order of ARP entries in the hardware. This command is mainly used to solve the
conflicts of ARP entries in the hardware table. When using the command to change the HASH
algorithms of L3 table, the new HASH algorithm will take effect after the consumers save the
configuration and restart system. The system will use the primary HASH algorithms before restart
system. Since all HASH algorithms may have HASH crashes under certain circumstances, particular
network configuration requires particular HASH algorithm. After repeated tests and verifications, the
recommended order of the five HASH algorithms mentioned above is: crc32u，crc32l，crc16u，crc16l.
Generally speaking, lsb algorithm is not recommended.
When using this command to change the HASH algorithms of L3 table, users should make effective
analysis of the network ARP configuration. That is why this command should uses under the guide of
technicians from the vendor after they analyze the network ARP configuration.
Examples:
Set the HASH algorithm as crc32u.
Switch(Config-if-Vlan1)#l3 hashselect crc32u
17.5.7 show arp
Command:
show arp [<ipaddress>] [<vlan-id>] [<hw-addr>] [type {static | dynamic}] [count] [vrf word]
Function:
Displays the ARP table.
Parameters:
VLAN; <hw-addr> for entry of specified MAC address; static for static ARP entry; dynamic for
dynamic ARP entry; count displays number of ARP entries; word is the specified vrf name.
Command mode:
Admin Mode