Creating, displaying, adding, deleting ARP entries and modifying ARP timers

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An Address Resolution Protocol (ARP) entry allows an interface to communicate with another interface even if they are not in the same multicast group.

An ARP entry can be created manually using the arp -t ib command.

To display all ARP entries, run the$ arp -t ib -a command. If you want to display a specific number of ARP entries, you can specify the number. For example, $ arp -t ib -a 5 displays 5 ARP entries.

The following command adds an ARP entry:

$ arp -t ib -s IB interface name dlid <16 bits DLID> dqp 
16 bits hex Destination Queue Pair Number  
ipaddr <Destination IP Address>

where:

Item	Description
DLID	is the Destination Local ID.
DGID	is the Destination Global ID.

The following command removes an ARP entry:

$ arp -t ib -d IP Address

The following modify the ARP entry’s timer values for complete and incomplete ARP entries. These values are used to remove the ARP entries after a period of time:

arp –t ib –i <number in complete minutes to remove incomplete ARP entries> 
-c <number in complete minutes to remove complete ARP entries>

The current default time for incomplete ARP entries to be removed is 3 minutes. For complete ARP entries, the default time is 24 hours. If the values need to be changed, the execution of the command will change only the values for all the current interfaces configured (or in defined state). If new interfaces are configured, the command must be executed again. The values are also changed in ODM.

The values can be changed dynamically to one specific interface by running the ifconfig command:

To change the incomplete ARP entry timer 
ifconfig ib0 inc_timer 4    
ifconfig ib0 com_timer 60